The Software Engineer role at Cambio is pivotal in delivering innovative solutions that impact the healthcare technology landscape. As a Software Engineer, you will contribute to the design, development, and maintenance of software systems that enhance patient care and operational efficiency. This position plays a crucial role in shaping the technologies that drive our products, affecting both users and stakeholders by ensuring high-quality, user-friendly solutions. At Cambio, you will be engaged in complex projects that require collaboration across multidisciplinary teams, including product management, quality assurance, and operations. You'll work with cutting-edge technologies to build scalable systems, particularly in the healthcare domain, which presents unique challenges and opportunities. This role not only demands technical expertise but also a commitment to understanding the intricacies of healthcare systems, making it both critical and rewarding.
Initial Screening
reportedAn initial evaluation to assess candidates' qualifications and fit for the role.
What to demonstrate
- An initial evaluation to assess candidates' qualifications and fit for the role
- Depth in Java
How to prepare
- Be able to walk your CV end to end in two minutes, and say why this company specifically.
- Have your salary expectations, notice period and location constraints ready, and ask for the rest of the loop in writing.
Technical Interviews
reportedEngagement with senior engineers focusing on problem-solving abilities and technical knowledge.
What to demonstrate
- Engagement with senior engineers focusing on problem-solving abilities and technical knowledge
- Depth in Java
How to prepare
- Answer aloud and timed: How do you ensure the quality and maintainability of your code?
- Answer aloud and timed: Explain the concept of an ER diagram and how you would design one for a healthcare-related system.
Final Discussions
reportedConversations to evaluate cultural fit and alignment with the company's values.
What to demonstrate
- Conversations to evaluate cultural fit and alignment with the company's values
- Depth in Java
How to prepare
- Answer aloud and timed: Discuss your experience with Java and its Object-Oriented Programming features.
- Answer aloud and timed: How would you approach debugging a complex software issue?
PracHub editorial advice for the preparation topics above.
Practice coding regularly
Regular coding practice on platforms like LeetCode or HackerRank can enhance your problem-solving skills.
Understand healthcare systems
Familiarize yourself with the healthcare domain to demonstrate your interest and understanding during interviews.
Be prepared for behavioral questions
Reflect on past experiences and be ready to discuss them in relation to teamwork and problem-solving.
Show enthusiasm for learning
Highlight your commitment to continuous learning, especially in the rapidly evolving tech landscape.
Choose a category, try a prompt, then open its approach, worked solution or follow-up when you need it.
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 a list of numbers, how would you find the two that sum to a specific target?
Given a list of numbers, how would you find the two that sum 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 the differences between various sorting algorithms and their time complexities.
Explain the differences between various sorting algorithms and their time complexities.
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?
Stop tag and share joins from fanning out a page
resource_tag is (resource_id, tag_id) with PK (resource_id, tag_id); resource_share is (resource_id, shared_with_user_id, permission). The tagged-and-shared listing inner-joins resource to both, filters tenant_id, tag_id = ANY($2) and shared_with_user_id = $3, orders by updated_at DESC and takes 50. Pages come back with fewer than 50 distinct resources and the total in the header is far too high. Explain the row multiplication, rewrite both the page query and the count query so each is correct, and name the index each one needs. PostgreSQL 16.
Approach
- Do the arithmetic against the predicates that are actually there. An inner join emits one row per matching child row, and both joins are filtered: tag_id = ANY($2) admits only the requested tags, shared_with_user_id = $3 admits one user's share rows. So a resource holding three of the requested tags and shared with $3 once yields three rows, not one — the multiplier is its count of matching tags times its share rows for that single user, and that second factor is 1 unless the table admits duplicate (resource_id, shared_with_user_id) pairs. LIMIT 50 then limits rows rather than resources, and COUNT(*) counts pairs — the header is the product, not the population.
- Reject DISTINCT as the fix. It deduplicates after the product has been built, so the planner must materialise and sort the fanned-out set before the LIMIT can apply, and it leaves any SUM or AVG in the same select list wrong.
- Rewrite both filters as semi-joins, keeping resource as the only row source: AND EXISTS (SELECT 1 FROM resource_tag rt WHERE rt.resource_id = r.resource_id AND rt.tag_id = ANY($2)) and the same shape against resource_share. A semi-join stops at the first match per resource and preserves the driving index order, so ORDER BY updated_at DESC, resource_id DESC LIMIT 50 still stops after 50 rows.
- Count with the same predicates and no join at all: SELECT count(*) FROM resource r WHERE r.tenant_id = $1 AND r.status = 'active' AND EXISTS (...) AND EXISTS (...). Nothing multiplies a resource, so the number is the population.
Follow-up
- The filter changes from 'any of these tags' to 'all of these tags'. Rewrite it and state what it costs relative to the ANY form.
- A resource can be shared with the same user twice under different permissions. Does your count change, and should it?
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?
Describe a recent project you worked on and the technologies you used.
Describe a recent project you worked on and the technologies you used.
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 microservices, and how have you implemented them in your past projects?
What are microservices, and how have you implemented them in your past projects?
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 you ensure the quality and maintainability of your code?
How do you ensure the quality and maintainability of your code?
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?
Explain the concept of an ER diagram and how you would design one for a healthcare-related system.
Explain the concept of an ER diagram and how you would design one for a healthcare-related system.
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?
Given a specific healthcare scenario, how would you design a solution that scales?
Given a specific healthcare scenario, how would you design a solution that scales?
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?
What considerations would you take into account when migrating a monolithic application to microservices?
What considerations would you take into account when migrating a monolithic application to microservices?
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 would you approach debugging a complex software issue?
How would you approach debugging a complex software issue?
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 Cambio candidates report.
Prepare, practise & reflect
One practical outcome each day. Spend longer where you need it.
0 / 7 done01Map the Cambio loop
- Write out the reported sequence: Initial Screening, Technical Interviews, Final Discussions.
- 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 Java
- Spend the session on Java, which Cambio candidates report being tested on.
- Write one worked example in Java and time yourself on it.
Deliverable: One timed worked example in Java.
03Work Object-Oriented Programming (OOP)
- Spend the session on Object-Oriented Programming (OOP), which Cambio candidates report being tested on.
- Write one worked example in Object-Oriented Programming (OOP) and time yourself on it.
Deliverable: One timed worked example in Object-Oriented Programming (OOP).
04Work Microservices Architecture
- Spend the session on Microservices Architecture, which Cambio candidates report being tested on.
- Write one worked example in Microservices Architecture and time yourself on it.
Deliverable: One timed worked example in Microservices Architecture.
05Answer out loud: Technical / Domain Questions
- Answer aloud, timed: Describe a recent project you worked on and the technologies you used.
- Answer aloud, timed: What are microservices, and how have you implemented them in your past projects?
Deliverable: Spoken answers to 2 reported Technical / Domain Questions question(s), under time.
06Answer out loud: Problem-solving / Case Studies
- Answer aloud, timed: How would you approach debugging a complex software issue?
- Answer aloud, timed: Describe a time when you had to make a trade-off between performance and maintainability in your code.
Deliverable: Spoken answers to 2 reported Problem-solving / Case Studies question(s), under time.
07Answer out loud: Behavioral / Leadership
- Answer aloud, timed: Tell me about a time you had to work collaboratively with a difficult team member.
- Answer aloud, timed: How do you prioritize your tasks when working on multiple projects?
Deliverable: Spoken answers to 2 reported Behavioral / Leadership 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.
Discuss your experience with Java and its Object-Oriented Programming features.
Discuss your experience with Java and its Object-Oriented Programming features.
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 time when you had to make a trade-off between performance and maintainability in your code.
Describe a time when you had to make a trade-off between performance and maintainability in your code.
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 collaboratively with a difficult team member.
Tell me about a time you had to work collaboratively with a difficult team member.
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 your tasks when working on multiple projects?
How do you prioritize your tasks when working on 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?
Discuss a failure you've experienced in a project and what you learned from it.
Discuss a failure you've experienced in a project and what you learned from 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 work in the healthcare technology space?
What motivates you to work in the healthcare technology space?
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
Discuss your experience with Java and its Object-Oriented Programming features.
- 02
Describe a time when you had to make a trade-off between performance and maintainability in your code.
- 03
Tell me about a time you had to work collaboratively with a difficult team member.
- 04
How do you prioritize your tasks when working on multiple projects?
How difficult are the interviews at Cambio?
The interviews can be challenging, especially in the technical areas. Candidates should prepare thoroughly by practicing coding problems and reviewing relevant technologies.
Cambio Software Engineer candidate reports ↗What differentiates successful candidates?
Successful candidates typically demonstrate a strong technical foundation, effective problem-solving skills, and a good cultural fit with the company values.
Cambio Software Engineer candidate reports ↗What is the timeline from initial screen to offer?
The typical timeline can vary, but candidates often receive feedback within a few weeks after their interviews.
Cambio Software Engineer candidate reports ↗Is remote work an option for this role?
Depending on the team and project requirements, remote work may be possible. Candidates should inquire during their interviews about specific arrangements.
Cambio Software Engineer candidate reports ↗What topics does Cambio test in interviews?
Cambio interviews most often cover Problem Solving, Java, Frontend Engineering, Object-Oriented Programming (OOP), and JavaScript. The exact emphasis depends on the specific role you apply for.
Cambio 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.
- 01Cambio 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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