At SLB (formerly Schlumberger), software engineering is not just about writing code; it is about powering the global energy transition and optimizing complex physical operations through digital technology. As a Software Engineer, you will build and scale high-performance applications, cloud-native platforms, and intelligent edge systems that directly interface with massive physical machinery, IoT drilling devices, and real-time subsurface data pipelines. The software you develop at SLB has a direct, real-world impact. Whether you are working on the DELFI cognitive exploration and production environment, developing real-time data ingestion pipelines for horizontal drilling operations, or building advanced physical simulation tools, your code will help optimize resource extraction and reduce carbon footprints. The scale of data, the necessity for sub-millisecond latency in extreme environments, and the integration of hardware and software make this role exceptionally challenging and intellectually rewarding. To succeed as a Software Engineer at, you must possess a unique blend of core computer science proficiency and physical-world problem-solving skills. The company values candidates who can bridge the gap between abstract algorithmic logic and practical engineering constraints, collaborating closely with petroleum engineers, geophysicists, and hardware teams to deliver robust, enterprise-grade software. SLB
Online Application
reportedBegin the process by submitting an online application or participating in campus recruitment.
What to demonstrate
- Begin the process by submitting an online application or participating in campus recruitment
- Depth in DSA (Data Structures & Algorithms)
How to prepare
- Answer aloud and timed: Write an efficient algorithm to find all possible palindromic substrings within a given string.
- Answer aloud and timed: Implement a function to convert a Roman numeral string to its corresponding decimal integer.
Online Assessment
reportedComplete an automated assessment evaluating cognitive abilities, logic, mathematics, physics, and programming skills.
What to demonstrate
- Complete an automated assessment evaluating cognitive abilities, logic, mathematics, physics, and programming skills
- Depth in DSA (Data Structures & Algorithms)
How to prepare
- Answer aloud and timed: Given a directed graph representing a network of sensor nodes on a drilling rig, write a program using Depth-First Search (DFS) or Breadth-First Search (BFS) to detect cycles or find the shortest path.
- Answer aloud and timed: Write a program to check if two strings are anagrams of each other.
Group Discussions
reportedParticipate in group discussions and collaborative exercises to assess communication and leadership potential.
What to demonstrate
- Participate in group discussions and collaborative exercises to assess communication and leadership potential
- Depth in DSA (Data Structures & Algorithms)
How to prepare
- Answer aloud and timed: Implement an algorithm to remove all vowels from a string in-place or with minimal space complexity.
- Answer aloud and timed: How would you design a REST API to stream real-time sensor data from an offshore rig to a centralized cloud database?
Live Coding Screen
reportedEngage in a live coding session through third-party platforms to demonstrate technical skills.
What to demonstrate
- Engage in a live coding session through third-party platforms to demonstrate technical skills
- Depth in DSA (Data Structures & Algorithms)
How to prepare
- Answer aloud and timed: Explain the core concepts of Object-Oriented Programming (OOP) and how you would design a system of classes to represent different types of drilling tools.
- Answer aloud and timed: What are the differences between relational databases (SQL) and NoSQL databases, and which would you choose for storing high-frequency time-series sensor data?
Technical Interviews
reportedAttend deep-dive virtual or onsite interviews with engineering managers to discuss technical expertise.
What to demonstrate
- Attend deep-dive virtual or onsite interviews with engineering managers to discuss technical expertise
- Depth in DSA (Data Structures & Algorithms)
How to prepare
- Answer aloud and timed: Explain the role of Cloud Computing in modern software architectures. How would you deploy and scale microservices using containerization?
- Answer aloud and timed: How do network protocols (such as TCP/IP vs. UDP) impact real-time data transmission in remote, low-bandwidth environments?
Project Presentation
reportedPresent past projects to a technical panel to showcase your experience and skills.
What to demonstrate
- Present past projects to a technical panel to showcase your experience and skills
- Depth in DSA (Data Structures & Algorithms)
How to prepare
- Answer aloud and timed: Why do you want to work at SLB rather than a traditional tech-only company?
- Answer aloud and timed: Tell me about a time you had to work with a difficult teammate. How did you resolve the conflict and ensure the project succeeded?
Behavioral Rounds
reportedParticipate in behavioral interviews focusing on safety, inclusion, and cultural fit within the company.
What to demonstrate
- Participate in behavioral interviews focusing on safety, inclusion, and cultural fit within the company
- Depth in DSA (Data Structures & Algorithms)
How to prepare
- Prepare three examples from your own work, each with a decision you made and an outcome you can quantify.
- Re-read the description of the behavioral rounds above and write down what you would ask to confirm before it.
4 candidate reports. Individual accounts describe a particular role and hiring cycle.
SLB Full Stack Engineer interview: puzzle, project discussion, DSA, and design
My process opened with a general HR-style introduction and then moved into technical rounds. The first technical round was light, with a basic puzzle that felt more like a check on how I think than a demand for deep mastery. A project discussion followed and became a standard conversation about explaining my work clearly. The next technical round shifted to medium-level DSA with basic system desi…
Read full experienceSLB Software Engineer interview experience: English exam and engineer interview
The process opened with an English exam and a basic logic and math check on a platform. Everything in the test was in English. Passing it was a clear gate, after which the process became an interview rather than another assessment. I then had about a half-hour interview with an engineer. I only learned whether I would move to the second round after that conversation, so there was little room to r…
Read full experienceSLB Software Engineer interview: fit discussion and portal English evaluation
After a recruiter-style conversation, I met with HR and then a manager or mentor. The process felt friendly and focused on the material I had already shared against the job description, especially whether my experience fit what they needed. I also completed an English evaluation through a portal, so it did not really test speaking. The role was in Digital and Integration, which was described as a…
Read full experienceSLB Software Engineer interview: Java concepts and linked lists
The technical interview focused on Java concepts and data-structures fundamentals. I was asked about OOP, including the idea behind an "oops" concept and what variables to declare when creating an object. There were also linked-list questions. The questions were not presented as tricks. They tested whether my everyday Java knowledge and core data-structures understanding were really there. The qu…
Read full experiencePracHub editorial advice for the preparation topics above.
Going into the loop without having done this.
To maximize your chances of securing an offer at SLB, keep these high-impact, practical tips in mind:
Going into the loop without having done this.
Master your resume projects: SLB engineers will grill you extensively on your past projects. You must be able to explain the "why" behind every technology choice, architecture decision, and protocol you used. Be ready to explain how you deployed your applications.
Going into the loop without having done this.
Project a strong, collaborative personality: In group assessments, show that you are an active listener and an encouraging team player. Avoid being overly aggressive, but do not fade into the background. Take on structured roles like timekeeper or coordinator if appropriate.
Going into the loop without having done this.
Prepare your technical presentation thoroughly: If you are asked to present a past project, choose a topic you understand deeply. Do not pick an overly complex topic just to impress the panel if you cannot defend the underlying math, physics, or architectural trade-offs during Q&A.
Going into the loop without having done this.
Understand the energy sector: Show that you have researched SLB's transition toward digital energy services and sustainability. Being knowledgeable about how software optimizes physical energy operations will immediately set you apart from candidates who only apply to traditional tech companies.
Choose a category, try a prompt, then open its approach, worked solution or follow-up when you need it.
Write an efficient algorithm to find all possible palindromic substrings within a given string.
Write an efficient algorithm to find all possible palindromic substrings within a given string.
Approach
- Restate the input: its shape, its size, and what is guaranteed about it.
- Name the brute-force solution and its complexity before improving on it.
- Choose the data structure from the access pattern, not from familiarity.
- State the target complexity and say which constraint rules the naive version out.
Follow-up
- How does this change if the input no longer fits in memory?
- What is the worst case, and how likely is it on real data?
Implement a function to convert a Roman numeral string to its corresponding decimal integer.
Implement a function to convert a Roman numeral string to its corresponding decimal integer.
Approach
- Restate the input: its shape, its size, and what is guaranteed about it.
- Name the brute-force solution and its complexity before improving on it.
- Choose the data structure from the access pattern, not from familiarity.
- State the target complexity and say which constraint rules the naive version out.
Follow-up
- How does this change if the input no longer fits in memory?
- What is the worst case, and how likely is it on real data?
Given a directed graph representing a network of sensor nodes on a drilling rig, write a program using Depth-F
Given a directed graph representing a network of sensor nodes on a drilling rig, write a program using Depth-First Search (DFS) or Breadth-First Search (BFS) to detect cycles or find the shortest path.
Approach
- Restate the input: its shape, its size, and what is guaranteed about it.
- Name the brute-force solution and its complexity before improving on it.
- Choose the data structure from the access pattern, not from familiarity.
- State the target complexity and say which constraint rules the naive version out.
Follow-up
- How does this change if the input no longer fits in memory?
- What is the worst case, and how likely is it on real data?
Write a program to check if two strings are anagrams of each other.
Write a program to check if two strings are anagrams of each other.
Approach
- Restate the input: its shape, its size, and what is guaranteed about it.
- Name the brute-force solution and its complexity before improving on it.
- Choose the data structure from the access pattern, not from familiarity.
- State the target complexity and say which constraint rules the naive version out.
Follow-up
- How does this change if the input no longer fits in memory?
- What is the worst case, and how likely is it on real data?
Implement an algorithm to remove all vowels from a string in-place or with minimal space complexity.
Implement an algorithm to remove all vowels from a string in-place or with minimal space complexity.
Approach
- Restate the input: its shape, its size, and what is guaranteed about it.
- Name the brute-force solution and its complexity before improving on it.
- Choose the data structure from the access pattern, not from familiarity.
- State the target complexity and say which constraint rules the naive version out.
Follow-up
- How does this change if the input no longer fits in memory?
- What is the worst case, and how likely is it on real data?
What are the differences between relational databases (SQL) and NoSQL databases, and which would you choose fo
What are the differences between relational databases (SQL) and NoSQL databases, and which would you choose for storing high-frequency time-series sensor data?
Approach
- Name the grain you start from and join outward from it.
- Check whether any join is one-to-many before aggregating, or the sums inflate.
- Say which index the query would use, and what makes it unusable.
- Handle the rows that do not match: that is usually the actual question.
Follow-up
- How does the query change if that join becomes one-to-many?
- What happens to this when the table is ten times larger?
Denormalise tenant onto revisions and backfill it live
resource_revision (revision_id, resource_id, version, actor_user_id, change_kind, patch, request_id, created_at) has 400M rows and no tenant column; tenant_id lives only on resource. Two reads need it: a tenant-scoped audit feed ordered by created_at DESC, and an offboarding purge. Both join back to resource today. Justify adding tenant_id to resource_revision against those two reads, name the anomaly the copy introduces and the constraint that prevents it, then give the ordered migration for a live table taking 1.2k writes/second — the lock each step takes, how the backfill is batched, and where each step stops being reversible. PostgreSQL 16.
Approach
- Justify from the access path rather than from taste. Without the column, the audit feed either scans resource_revision by created_at and discards other tenants' rows, or resolves the tenant's resource_ids first and probes with them — both proportional to the tenant's whole history rather than to one page. With (tenant_id, created_at DESC, revision_id DESC) it is a seek that stops at 50 rows, and the purge becomes a ranged delete instead of a join.
- Name the cost exactly: a second copy of a fact can disagree with the first. Make the disagreement unwritable rather than documented — add UNIQUE (resource_id, tenant_id) on resource so it can serve as a foreign-key target, then FOREIGN KEY (resource_id, tenant_id) REFERENCES resource (resource_id, tenant_id) on the revision table. A revision can then only ever carry its parent's tenant.
- Step one, expand: ALTER TABLE resource_revision ADD COLUMN tenant_id BIGINT NULL, with no default, so it is a catalogue change and no rewrite. It still needs ACCESS EXCLUSIVE for an instant, and that instant queues behind the longest open transaction on the table while every later query queues behind it — set lock_timeout to 2s and retry rather than wait.
- Step two, dual-write: deploy the writer that populates tenant_id on every new revision while reads still use the join. Reversible by redeploying the previous build, because nothing reads the column yet.
Follow-up
- The backfill is half finished and a rollback is required. What state is the table in, and what does the previous build do with a half-populated column?
- How do you verify the backfill actually finished, given rows are still being inserted while it runs?
How would you design a REST API to stream real-time sensor data from an offshore rig to a centralized cloud da
How would you design a REST API to stream real-time sensor data from an offshore rig to a centralized cloud database?
Approach
- Say who the caller is and what they do when the call fails halfway.
- Define the identity of a request so a retry cannot double-apply it.
- Separate accepted, pending, failed and confirmed; they are different facts.
- Design the error taxonomy before the success shape; callers branch on it.
Follow-up
- What happens if the caller retries after a timeout?
- How does a client discover it is on an old version of this contract?
Explain the core concepts of Object-Oriented Programming (OOP) and how you would design a system of classes to
Explain the core concepts of Object-Oriented Programming (OOP) and how you would design a system of classes to represent different types of drilling tools.
Approach
- Fix the scope first: who calls this, how often, and what they do when it fails.
- Name the read and write paths separately; they rarely have the same bottleneck.
- Choose a partition key and say what query it makes expensive.
- State the consistency you need, and where you are willing to be stale.
Follow-up
- What breaks first when traffic grows ten times?
- How does this behave when that dependency is down for an hour?
Explain the role of Cloud Computing in modern software architectures. How would you deploy and scale microserv
Explain the role of Cloud Computing in modern software architectures. How would you deploy and scale microservices using containerization?
Approach
- Fix the scope first: who calls this, how often, and what they do when it fails.
- Name the read and write paths separately; they rarely have the same bottleneck.
- Choose a partition key and say what query it makes expensive.
- State the consistency you need, and where you are willing to be stale.
Follow-up
- What breaks first when traffic grows ten times?
- How does this behave when that dependency is down for an hour?
How do network protocols (such as TCP/IP vs. UDP) impact real-time data transmission in remote, low-bandwidth
How do network protocols (such as TCP/IP vs. UDP) impact real-time data transmission in remote, low-bandwidth environments?
Approach
- Fix the scope first: who calls this, how often, and what they do when it fails.
- Name the read and write paths separately; they rarely have the same bottleneck.
- Choose a partition key and say what query it makes expensive.
- State the consistency you need, and where you are willing to be stale.
Follow-up
- What breaks first when traffic grows ten times?
- How does this behave when that dependency is down for an hour?
If you had to build a physical structure (like a tower) using limited materials (skewers, paper, adhesives) wi
If you had to build a physical structure (like a tower) using limited materials (skewers, paper, adhesives) with a team under a tight deadline, how would you organize the tasks?
Approach
- Clarify what is being asked and what a complete answer contains.
- State your assumptions explicitly before working the problem.
- Say what you would check first and why it is the highest-information step.
- Work from the requirement backwards to the design.
Follow-up
- What assumption would you test first?
- How would you know your answer was wrong?
Discuss the pros and cons of online marketing vs. traditional marketing, or debate whether artificial intellig
Discuss the pros and cons of online marketing vs. traditional marketing, or debate whether artificial intelligence will completely replace human intelligence.
Approach
- Clarify what is being asked and what a complete answer contains.
- State your assumptions explicitly before working the problem.
- Say what you would check first and why it is the highest-information step.
- Work from the requirement backwards to the design.
Follow-up
- What assumption would you test first?
- How would you know your answer was wrong?
Present a 10-minute overview of a complex technical project you completed. What were the trade-offs you made,
Present a 10-minute overview of a complex technical project you completed. What were the trade-offs you made, and how did you debug the hardest issues?
Approach
- Establish what changed and when, before forming any theory.
- Pick a bisection that eliminates candidates whichever way it turns out.
- Check the instrumentation before believing the symptom.
- Separate the trigger from the cause; the deploy is rarely the bug.
Follow-up
- What would you look at first, and what would it rule out?
- How would you tell a cause from a coincidence here?
Built from the rounds and topics SLB candidates report.
Prepare, practise & reflect
One practical outcome each day. Spend longer where you need it.
0 / 7 done01Map the SLB loop
- Write out the reported sequence: Online Application, Online Assessment, Group Discussions, Live Coding Screen, Technical Interviews, Project Presentation.
- For each round, write one sentence on what it is judging, from the description above, and mark the one you are least ready for.
Deliverable: A one-page map of the 7 reported rounds, with the weakest marked.
02Work DSA (Data Structures & Algorithms)
- Spend the session on DSA (Data Structures & Algorithms), which SLB candidates report being tested on.
- Write one worked example in DSA (Data Structures & Algorithms) and time yourself on it.
Deliverable: One timed worked example in DSA (Data Structures & Algorithms).
03Work Java
- Spend the session on Java, which SLB candidates report being tested on.
- Write one worked example in Java and time yourself on it.
Deliverable: One timed worked example in Java.
04Work Object-Oriented Programming (OOP) concepts
- Spend the session on Object-Oriented Programming (OOP) concepts, which SLB candidates report being tested on.
- Write one worked example in Object-Oriented Programming (OOP) concepts and time yourself on it.
Deliverable: One timed worked example in Object-Oriented Programming (OOP) concepts.
05Answer out loud: Coding & Algorithmic Problem Solving
- Answer aloud, timed: Write an efficient algorithm to find all possible palindromic substrings within a given string.
- Answer aloud, timed: Implement a function to convert a Roman numeral string to its corresponding decimal integer.
Deliverable: Spoken answers to 2 reported Coding & Algorithmic Problem Solving question(s), under time.
06Answer out loud: System Design & Core CS Fundamentals
- Answer aloud, timed: How would you design a REST API to stream real-time sensor data from an offshore rig to a centralized cloud database?
- Answer aloud, timed: Explain the core concepts of Object-Oriented Programming (OOP) and how you would design a system of classes to represent different types of drilling tools.
Deliverable: Spoken answers to 2 reported System Design & Core CS Fundamentals question(s), under time.
07Answer out loud: Behavioral & Cultural Fit
- Answer aloud, timed: Why do you want to work at SLB rather than a traditional tech-only company?
- Answer aloud, timed: Tell me about a time you had to work with a difficult teammate. How did you resolve the conflict and ensure the project succeeded?
Deliverable: Spoken answers to 2 reported Behavioral & Cultural Fit question(s), under time.
Expand any day for tasks and deliverables. Your progress is saved on this device.
Behavioural rounds judge the decision you made and what it cost.
Why do you want to work at SLB rather than a traditional tech-only company?
Why do you want to work at SLB rather than a traditional tech-only company?
Approach
- Pick a story where you made the decision, not one where you watched it.
- State the situation in two sentences and spend the rest on the reasoning.
- Give the blast radius: what could have broken, and what you measured.
- Name the disagreement and how you resolved it with evidence.
Follow-up
- What would you do differently if you ran that again?
- How did you know your change caused the improvement?
Tell me about a time you had to work with a difficult teammate. How did you resolve the conflict and ensure th
Tell me about a time you had to work with a difficult teammate. How did you resolve the conflict and ensure the project succeeded?
Approach
- Pick a story where you made the decision, not one where you watched it.
- State the situation in two sentences and spend the rest on the reasoning.
- Give the blast radius: what could have broken, and what you measured.
- Name the disagreement and how you resolved it with evidence.
Follow-up
- What would you do differently if you ran that again?
- How did you know your change caused the improvement?
Are you open to working in the field or visiting offshore rigs to understand how software is deployed in deman
Are you open to working in the field or visiting offshore rigs to understand how software is deployed in demanding environments?
Approach
- Pick a story where you made the decision, not one where you watched it.
- State the situation in two sentences and spend the rest on the reasoning.
- Give the blast radius: what could have broken, and what you measured.
- Name the disagreement and how you resolved it with evidence.
Follow-up
- What would you do differently if you ran that again?
- How did you know your change caused the improvement?
Describe a situation where you had to implement or advocate for safety protocols in your past work or academic
Describe a situation where you had to implement or advocate for safety protocols in your past work or academic experience.
Approach
- Pick a story where you made the decision, not one where you watched it.
- State the situation in two sentences and spend the rest on the reasoning.
- Give the blast radius: what could have broken, and what you measured.
- Name the disagreement and how you resolved it with evidence.
Follow-up
- What would you do differently if you ran that again?
- How did you know your change caused the improvement?
Where do you see yourself in five years, and how does your career aspiration align with the energy sector's di
Where do you see yourself in five years, and how does your career aspiration align with the energy sector's digital transformation?
Approach
- Pick a story where you made the decision, not one where you watched it.
- State the situation in two sentences and spend the rest on the reasoning.
- Give the blast radius: what could have broken, and what you measured.
- Name the disagreement and how you resolved it with evidence.
Follow-up
- What would you do differently if you ran that again?
- How did you know your change caused the improvement?
- 01
Why do you want to work at SLB rather than a traditional tech-only company?
- 02
Tell me about a time you had to work with a difficult teammate. How did you resolve the conflict and ensure the project succeeded?
- 03
Are you open to working in the field or visiting offshore rigs to understand how software is deployed in demanding environments?
- 04
Describe a situation where you had to implement or advocate for safety protocols in your past work or academic experience.
How difficult is the Software Engineer interview process at SLB?
The difficulty is generally rated as average to difficult. The coding questions themselves are usually Leetcode easy-to-medium, but the overall process is highly rigorous due to the multiple evaluation types, including online assessments, group discussions, technical presentations, and behavioral rounds.
SLB Software Engineer candidate reports ↗What is the purpose of the 3-minute interview round?
This round is common in campus recruitment drives to quickly evaluate your English communication skills, presence, and mental agility under pressure. You will be asked to introduce yourself or respond to a random situational card in a loud, communal space to test your focus and communication clarity.
SLB Software Engineer candidate reports ↗Does a Software Engineer at SLB need to work in the field?
While you will primarily work in an office or technology center, SLB highly values "field readiness." You may be asked to visit manufacturing facilities, laboratories, or active drilling rigs to understand how your software is utilized by field engineers. Demonstrating openness to these experiences is a major plus.
SLB Software Engineer candidate reports ↗How long does the entire hiring process take?
The timeline varies. Campus hiring drives can be incredibly fast, with multiple rounds completed in one or two days. For direct online applications, the process can take anywhere from a few weeks to several months, depending on the business line and location.
SLB Software Engineer candidate reports ↗What is the most common reason candidates get eliminated?
Many candidates fail either in the Group Discussion (GD) round due to poor collaboration/communication, or during the technical rounds because they cannot explain the underlying logic of their code or resume projects. Rote memorization of coding patterns without deep understanding will not pass the SLB panel.
SLB Software Engineer candidate reports ↗How hard is the SLB interview?
Candidates most commonly rate SLB interviews as medium, based on 515 reported interviews. About 49% of candidates who interview go on to receive an offer.
SLB Software Engineer candidate reports ↗What topics does SLB test in interviews?
SLB interviews most often cover Problem Solving, Communication Skills, Data Structures & Algorithms (DSA), System Design, and Java. The exact emphasis depends on the specific role you apply for.
SLB Software Engineer candidate reports ↗Is SLB a good place to work?
Employees rate SLB 3.9 out of 5 overall, based on aggregated workplace reviews spanning career growth, work-life balance, compensation, culture, and management.
SLB Software Engineer candidate reports ↗Where is SLB headquartered?
SLB is headquartered in Houston, TX.
SLB Software Engineer candidate reports ↗Sources & methodology 3 sources ↗
Official role evidence, timestamped platform data and clearly labeled preparation advice.
- 01SLB Software Engineer candidate reports ↗
Company-reported rounds, questions and FAQ.
candidate · Accessed 2026-09-22 - 02PracHub Software Engineer practice ↗
PracHub practice material, not company-reported.
platform · Accessed 2026-09-22 - 03PracHub preparation framework ↗
PracHub preparation guidance.
platform · Accessed 2026-09-22
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