As a Software Engineer at Raju Tech, you play a pivotal role in designing, developing, and maintaining software applications that enhance user experience and drive business efficiency. Your contributions directly impact the products we deliver, shaping the technology that powers our solutions and services. This position is not just about writing code; it involves understanding user needs, collaborating with cross-functional teams, and engaging in the entire software development lifecycle. At Raju Tech, you'll find opportunities to work on complex projects that challenge your skills and creativity. Whether you are developing scalable web applications or optimizing backend systems, your work is integral to our mission. You will collaborate with product managers, designers, and other engineers to create innovative solutions that meet market demands and exceed user expectations. This role offers a unique blend of technical challenges and strategic influence, making it both rewarding and essential to our success.
Written Assessment
reportedInitial assessment evaluating technical skills through a written test.
What to demonstrate
- Initial assessment evaluating technical skills through a written test
- Depth in DSA (Data Structures and Algorithms) Fundamentals
How to prepare
- Answer aloud and timed: What are the main features of Node.js and how is it different from traditional web server technologies?
- Answer aloud and timed: Explain the concept of multi-threading and its applications.
Technical Interviews
reportedOne or two interviews where candidates solve coding challenges and discuss software design.
What to demonstrate
- One or two interviews where candidates solve coding challenges and discuss software design
- Depth in DSA (Data Structures and Algorithms) Fundamentals
How to prepare
- Answer aloud and timed: What are the four pillars of Object-Oriented Programming (OOP)?
- Answer aloud and timed: How does MongoDB differ from traditional relational databases?
Behavioral Questions
reportedInterviews include behavioral questions to understand past experiences and cultural fit.
What to demonstrate
- Interviews include behavioral questions to understand past experiences and cultural fit
- Depth in DSA (Data Structures and Algorithms) Fundamentals
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 questions above and write down what you would ask to confirm before it.
PracHub editorial advice for the preparation topics above.
Practice Coding Challenges
Regularly solve coding problems on platforms like LeetCode or HackerRank to sharpen your skills.
Understand the Company Culture
Research Raju Tech’s values and mission statement to align your responses with our goals during the interview.
Prepare Questions
Have thoughtful questions ready for your interviewers to demonstrate your interest in the role and the company.
Mock Interviews
Conduct mock interviews with peers or use online resources to simulate the interview experience and gain confidence.
Choose a category, try a prompt, then open its approach, worked solution or follow-up when you need it.
Explain the concept of multi-threading and its applications.
Explain the concept of multi-threading and its applications.
Approach
- Say what the runtime actually does before reasoning about the code.
- Name what is shared across threads and what owns each piece of state.
- Identify the window where an invariant is briefly untrue.
- Distinguish a value from a reference to it, and say which one you handed out.
Follow-up
- What happens if two callers reach this at the same time?
- Where could this allocate more than you expect?
Write a function to reverse a linked list.
Write a function to reverse a linked list.
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 an array of integers, find two numbers such that they add up to a specific target.
Given an array of integers, find two numbers such that they add up to a specific target.
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?
Explain how you would implement a binary search algorithm.
Explain how you would implement a binary search algorithm.
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?
Hold a per-tenant active cap against concurrent creates
A tenant on the standard plan may hold at most 50 resources with status='active'. The create handler runs SELECT count(*) FROM resource WHERE tenant_id = $1 AND status = 'active', compares to 50, then inserts. Two creates arrive 3 ms apart on different instances and the tenant lands at 51. Name the anomaly, say whether PostgreSQL 16 READ COMMITTED or REPEATABLE READ prevents it and why, then give an implementation that holds the cap at READ COMMITTED with the exact statements. Finally, say what changes when the cap is 'at most one running export per tenant' on job_run.
Approach
- Name it: write skew. The two transactions read an overlapping set and write disjoint rows, so there is no row-level conflict for the engine to detect and each commit is individually legal.
- Rule out the levels precisely. READ COMMITTED takes a fresh snapshot per statement and takes no lock on the counted rows, so both see 49. PostgreSQL's REPEATABLE READ is snapshot isolation: it removes non-repeatable reads and phantoms within the snapshot but still admits write skew, because the anomaly is not a re-read of a changed row, it is a read of a set that a concurrent transaction invalidates. Only SERIALIZABLE closes it, by tracking the read dependency and aborting one transaction with SQLSTATE 40001 — a guarantee that exists only if the application re-runs the whole transaction from the read.
- Convert the set predicate into a single-row conflict: keep tenant.active_resource_count and run UPDATE tenant SET active_resource_count = active_resource_count + 1 WHERE tenant_id = $1 AND active_resource_count < 50 in the same transaction as the INSERT. Zero affected rows is the cap, returned as 409. The row lock serialises the decision at any isolation level, and contention is bounded to one tenant's row — which is also the fair-scheduling unit, unlike a global counter that would convoy every tenant behind one row.
- State the cost you just took on: a counter is a second source of truth that can drift, so every path that changes status must adjust it inside the same transaction, and a periodic reconciliation has to exist, with resource_revision as the authority for what the count should have been.
Follow-up
- A resource moves from archived back to active. Which statements change, and what breaks if the counter update and the status change land in different transactions?
- The cap becomes plan-dependent and a plan can change mid-month. Where does the number 50 live, and who reads it?
Explain why the owner filter ignores the listing index
The only index on resource is (tenant_id, status, updated_at DESC, resource_id DESC). A new endpoint returns one user's resources across all statuses, newest created first: WHERE tenant_id = $1 AND owner_user_id = $2 ORDER BY created_at DESC LIMIT 20. On a tenant with 2M rows it takes 900 ms and EXPLAIN shows a sort above a large scan. Explain precisely why the existing index cannot serve it, give the index that can, and state which of these the new index still will not help: owner_user_id alone across tenants; the same query ordered by updated_at. PostgreSQL 16.
Approach
- Separate the two jobs an index does. For filtering, a composite btree is seekable only on a left prefix, so with no predicate on status the scan can at best range over tenant_id and test owner_user_id per row; PostgreSQL 16 has no btree skip scan to jump the unconstrained column.
- For ordering, the index is sorted by (status, updated_at) within a tenant and not by created_at, so the LIMIT cannot stop early: every matching row is read and then sorted. That is the 'Sort Method: top-N heapsort' line, and it is why the plan reads 2M rows to answer with 20.
- Derive the replacement from the access path — equality, equality, then the ordering column: CREATE INDEX CONCURRENTLY ON resource (tenant_id, owner_user_id, created_at DESC). The scan seeks to the (tenant, owner) range and walks 20 entries in order, so the Sort node disappears along with the row-read.
- Treat INCLUDE (title, status) as conditional, not free. An index-only scan still visits the heap for any row whose page is not marked all-visible, so on a table taking 1.2k writes/second the win depends on autovacuum keeping the visibility map current, and the wider index costs more on every insert.
Follow-up
- 90% of rows are status='active'. Would a partial index WHERE status = 'active' change your answer, and for which of the three queries?
- A dashboard runs this for 40 owners in one page load. What changes about the design?
What are the main features of Node.js and how is it different from traditional web server technologies?
What are the main features of Node.js and how is it different from traditional web server technologies?
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?
What are the four pillars of Object-Oriented Programming (OOP)?
What are the four pillars of Object-Oriented Programming (OOP)?
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?
How does MongoDB differ from traditional relational databases?
How does MongoDB differ from traditional relational databases?
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?
If you were to design a system for managing employee records, what key features would you include?
If you were to design a system for managing employee records, what key features would you include?
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?
Can you walk us through your thought process for solving a specific coding challenge you faced?
Can you walk us through your thought process for solving a specific coding challenge you faced?
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?
How would you approach optimizing a slow-running application?
How would you approach optimizing a slow-running application?
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?
Can you describe your approach to debugging a complex application?
Can you describe your approach to debugging a complex application?
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 Raju Tech candidates report.
Prepare, practise & reflect
One practical outcome each day. Spend longer where you need it.
0 / 7 done01Map the Raju Tech loop
- Write out the reported sequence: Written Assessment, Technical Interviews, Behavioral Questions.
- 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 3 reported rounds, with the weakest marked.
02Work DSA (Data Structures and Algorithms) Fundamentals
- Spend the session on DSA (Data Structures and Algorithms) Fundamentals, which Raju Tech candidates report being tested on.
- Write one worked example in DSA (Data Structures and Algorithms) Fundamentals and time yourself on it.
Deliverable: One timed worked example in DSA (Data Structures and Algorithms) Fundamentals.
03Work Node.js
- Spend the session on Node.js, which Raju Tech candidates report being tested on.
- Write one worked example in Node.js and time yourself on it.
Deliverable: One timed worked example in Node.js.
04Work Data Structures
- Spend the session on Data Structures, which Raju Tech candidates report being tested on.
- Write one worked example in Data Structures and time yourself on it.
Deliverable: One timed worked example in Data Structures.
05Answer out loud: Technical / Domain Questions
- Answer aloud, timed: What are the main features of Node.js and how is it different from traditional web server technologies?
- Answer aloud, timed: Explain the concept of multi-threading and its applications.
Deliverable: Spoken answers to 2 reported Technical / Domain Questions question(s), under time.
06Answer out loud: Behavioral / Leadership
- Answer aloud, timed: Describe a challenging project you worked on. What was your role, and how did you overcome obstacles?
- Answer aloud, timed: How do you prioritize tasks when handling multiple projects?
Deliverable: Spoken answers to 2 reported Behavioral / Leadership question(s), under time.
07Answer out loud: Problem-Solving / Case Studies
- Answer aloud, timed: If you were to design a system for managing employee records, what key features would you include?
- Answer aloud, timed: Can you walk us through your thought process for solving a specific coding challenge you faced?
Deliverable: Spoken answers to 2 reported Problem-Solving / Case Studies 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.
Describe a challenging project you worked on. What was your role, and how did you overcome obstacles?
Describe a challenging project you worked on. What was your role, and how did you overcome obstacles?
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?
How do you prioritize tasks when handling multiple projects?
How do you prioritize tasks when handling multiple projects?
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 when you had to work with a difficult teammate. How did you handle it?
Tell me about a time when you had to work with a difficult teammate. How did you handle it?
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?
What motivates you to perform at your best in a team environment?
What motivates you to perform at your best in a team environment?
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
Describe a challenging project you worked on. What was your role, and how did you overcome obstacles?
- 02
How do you prioritize tasks when handling multiple projects?
- 03
Tell me about a time when you had to work with a difficult teammate. How did you handle it?
- 04
What motivates you to perform at your best in a team environment?
How difficult are the interviews at Raju Tech?
The interviews are generally rated as easy to average in difficulty. Candidates should prepare thoroughly, especially in technical areas, to feel confident.
Raju Tech Software Engineer candidate reports ↗What differentiates successful candidates?
Successful candidates demonstrate a strong understanding of core technical concepts, effective problem-solving skills, and a good cultural fit with our team values.
Raju Tech Software Engineer candidate reports ↗What is the typical timeline from initial screen to offer?
The interview process can take anywhere from a few weeks to a month, depending on scheduling and the number of candidates being considered.
Raju Tech Software Engineer candidate reports ↗Is remote work an option?
Raju Tech offers flexible work arrangements, including remote and hybrid options, depending on team requirements and individual preferences.
Raju Tech Software Engineer candidate reports ↗What is the culture like at Raju Tech?
Our culture emphasizes collaboration, innovation, and continuous learning. We value open communication and encourage feedback to foster a positive work environment.
Raju Tech Software Engineer candidate reports ↗What topics does Raju Tech test in interviews?
Raju Tech interviews most often cover DSA (Data Structures and Algorithms) Fundamentals, Node.js, Data Structures, Algorithms, and Angular. The exact emphasis depends on the specific role you apply for.
Raju Tech Software Engineer candidate reports ↗Sources & methodology 3 sources ↗
No official company page is cited. Rounds and questions come from candidate reports and PracHub editorial material; each source shows the date it was read.
- 01Raju Tech Software Engineer candidate reports ↗
Company-reported rounds, questions and FAQ.
Candidate reports · Accessed 2026-09-22 - 02PracHub Software Engineer practice ↗
PracHub practice material, not company-reported.
PracHub page · Accessed 2026-09-22 - 03PracHub preparation framework ↗
PracHub preparation guidance.
PracHub page · Accessed 2026-09-22
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