As a Software Engineer at GEHA, you play a pivotal role in designing and developing software solutions that enhance the user experience and operational efficiency across the organization. This position is integral to the development of innovative applications and systems that support GEHA's mission of providing exceptional healthcare services to its members. You will be involved in various projects that directly impact the quality of care and customer satisfaction, making your contributions critical to both the users and the business. In this role, you will engage with diverse teams to tackle complex technical challenges, ensuring that your solutions are scalable, secure, and user-friendly. You will work on a range of products and technologies, including APIs and integrations, which are essential for streamlining operations and facilitating communication across different platforms. The complexity and scale of the projects at GEHA offer an exciting opportunity for professional growth and the chance to make a significant impact in the healthcare sector.
Phone Screen
reportedInitial phone screen with HR to discuss standard questions about your background and experience.
What to demonstrate
- Initial phone screen with HR to discuss standard questions about your background and experience
- Depth in C#
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 Interview
reportedEngage with team members, including managers and developers, involving coding challenges and system design questions.
What to demonstrate
- Including managers and developers, involving coding challenges and system design questions
- Depth in C#
How to prepare
- Answer aloud and timed: What are the key differences between synchronous and asynchronous programming?
- Answer aloud and timed: How do you ensure code quality and maintainability in your projects?
PracHub editorial advice for the preparation topics above.
Practice coding challenges
Utilize platforms like LeetCode or HackerRank to refine your coding skills and prepare for technical assessments.
Understand GEHA's mission
Familiarize yourself with GEHA’s goals and values, and think about how your work as a software engineer can contribute to these.
Be ready to share examples
Prepare specific examples from your past experiences that showcase your skills and successes. Use the STAR (Situation, Task, Action, Result) method to structure your responses.
Engage with the interviewers
Ask insightful questions about the team dynamics and current projects. This shows your interest in the role and helps you gauge if it’s the right fit for you.
Choose a category, try a prompt, then open its approach, worked solution or follow-up when you need it.
What are the key differences between synchronous and asynchronous programming?
What are the key differences between synchronous and asynchronous programming?
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 string in C#.
Write a function to reverse a string in C#.
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?
How would you implement a search algorithm to find an element in a sorted array?
How would you implement a search algorithm to find an element in a sorted array?
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?
Keep soft-deleted accounts from blocking re-registration
app_user holds user_id, tenant_id, email CITEXT, password_hash (NULL for SSO principals), email_verified_at, auth_version, status ('invited','active','suspended','deactivated'), created_at, updated_at, deleted_at. Two live accounts for one address inside a tenant must be impossible, but an address freed by a soft delete must be reusable, and the same tenant may delete and re-register it repeatedly. Write the uniqueness DDL for PostgreSQL 16, then the equivalent for MySQL 8 where partial indexes do not exist, and say what each permits once three deleted rows already hold that address.
Approach
- Start from what is actually unique: not (tenant_id, email), but (tenant_id, email) among live rows. PostgreSQL says that directly — CREATE UNIQUE INDEX app_user_live_email ON app_user (tenant_id, email) WHERE deleted_at IS NULL. A full constraint over the same two columns burns the address permanently the first time someone deletes an account.
- Keep case-insensitivity in the type or the index, never in the application: CITEXT as given, or UNIQUE (tenant_id, lower(email)) as an expression index where the extension is unavailable. A case-sensitive unique column is exactly how two accounts for one human appear.
- For MySQL 8 the predicate has to move inside the key: add a discriminator column that is a constant 0 while the row is live and is set to user_id on delete, with UNIQUE (tenant_id, email, deleted_marker). Live rows share the constant and still collide; deleted rows differ from each other and stop colliding.
- State the NULL variant and its dependency: leaving the marker NULL for deleted rows also works, because a unique index treats NULLs as distinct — true in MySQL, and true in PostgreSQL only under the default NULLS DISTINCT, which PostgreSQL 15 lets you reverse. Check the polarity against the three existing deleted rows: constant-on-live is what preserves the collision you want, and reversing it silently admits duplicate live accounts.
Follow-up
- A deleted account re-registers with the same address the next day. Do the old resource rows follow the new user_id, and how does the API keep the two principals apart?
- How do you honour an erasure request while resource_revision.actor_user_id still references this table?
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?
Explain the principles of Object-Oriented Programming (OOP).
Explain the principles 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 do you ensure code quality and maintainability in your projects?
How do you ensure code quality and maintainability in your projects?
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 walk us through a challenging bug you encountered and how you resolved it?
Can you walk us through a challenging bug you encountered and how you resolved it?
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?
Design a RESTful API for a healthcare application. What considerations would you keep in mind?
Design a RESTful API for a healthcare application. What considerations would you keep in mind?
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 scaling an application to handle increased user traffic?
How would you approach scaling an application to handle increased user traffic?
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?
Discuss the trade-offs between microservices and monolithic architectures.
Discuss the trade-offs between microservices and monolithic architectures.
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?
You are given a legacy codebase with no documentation. How would you approach understanding and improving it?
You are given a legacy codebase with no documentation. How would you approach understanding and improving it?
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 do you troubleshoot performance issues in a web application?
How do you troubleshoot performance issues in a web 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 GEHA candidates report.
Prepare, practise & reflect
One practical outcome each day. Spend longer where you need it.
0 / 7 done01Map the GEHA loop
- Write out the reported sequence: Phone Screen, Technical Interview.
- 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 2 reported rounds, with the weakest marked.
02Work C#
- Spend the session on C#, which GEHA candidates report being tested on.
- Write one worked example in C# and time yourself on it.
Deliverable: One timed worked example in C#.
03Work .NET Framework
- Spend the session on .NET Framework, which GEHA candidates report being tested on.
- Write one worked example in .NET Framework and time yourself on it.
Deliverable: One timed worked example in .NET Framework.
04Work Object-Oriented Programming (OOP)
- Spend the session on Object-Oriented Programming (OOP), which GEHA 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).
05Answer out loud: Technical / Domain Questions
- Answer aloud, timed: Explain the principles of Object-Oriented Programming (OOP).
- Answer aloud, timed: Describe your experience with the.NET framework and how you have utilized it in your projects.
Deliverable: Spoken answers to 2 reported Technical / Domain Questions question(s), under time.
06Answer out loud: System Design / Architecture
- Answer aloud, timed: Design a RESTful API for a healthcare application. What considerations would you keep in mind?
- Answer aloud, timed: How would you approach scaling an application to handle increased user traffic?
Deliverable: Spoken answers to 2 reported System Design / Architecture question(s), under time.
07Answer out loud: Behavioral / Leadership
- Answer aloud, timed: Describe a time you faced a conflict within your team. How did you handle it?
- Answer aloud, timed: How do you prioritize 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.
Describe your experience with the.NET framework and how you have utilized it in your projects.
Describe your experience with the.NET framework and how you have utilized it in your 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?
Describe a time you faced a conflict within your team. How did you handle it?
Describe a time you faced a conflict within your team. 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?
How do you prioritize tasks when working on multiple projects?
How do you prioritize 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?
Give an example of how you have mentored a junior developer.
Give an example of how you have mentored a junior developer.
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 your experience with the.NET framework and how you have utilized it in your projects.
- 02
Describe a time you faced a conflict within your team. How did you handle it?
- 03
How do you prioritize tasks when working on multiple projects?
- 04
Give an example of how you have mentored a junior developer.
How difficult is the interview process?
The interview process at GEHA can be considered rigorous, focusing heavily on both technical and behavioral aspects. Candidates typically prepare for several weeks to feel confident in their abilities.
GEHA Software Engineer candidate reports ↗What differentiates successful candidates?
Successful candidates often showcase strong technical skills along with effective communication and collaboration abilities. They demonstrate a clear understanding of GEHA's mission and align their responses with the company’s values.
GEHA Software Engineer candidate reports ↗What is the culture like at GEHA?
GEHA promotes a collaborative and innovative culture. Employees are encouraged to share ideas and work together to enhance healthcare solutions, making it a supportive environment for professional growth.
GEHA Software Engineer candidate reports ↗What is the typical timeline from initial screen to offer?
Candidates can expect a timeline of 2-4 weeks from the initial interview to receiving an offer. Keep in mind that this can vary based on the team and other external factors.
GEHA Software Engineer candidate reports ↗Are there remote work opportunities?
Yes, GEHA offers remote work options for certain positions, including software engineering roles. Be prepared to discuss your preferences and experience with remote collaboration during the interview.
GEHA Software Engineer candidate reports ↗What topics does GEHA test in interviews?
GEHA interviews most often cover Stakeholder Management, Data Quality Management, C#, Salesforce (CRM Platform), and Sales Operations (Domain Knowledge). The exact emphasis depends on the specific role you apply for.
GEHA 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.
- 01GEHA 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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