Berkshire Hathaway Specialty Insurance · Software Engineer
Updated · 2026-10-02

Berkshire Hathaway Specialty Insurance Software Engineer
Interview Guide

THE 60-SECOND BRIEF

As a Software Engineer at Berkshire Hathaway Specialty Insurance (BHSI), you play a vital role in building and scaling the digital platforms that drive commercial property, casualty, and specialty insurance products. You contribute directly to modern, full-stack applications and cloud-based ecosystems that support critical business operations, such as SME insurance and travel insurance domains. Your work directly impacts how brokers, customers, and internal teams interact with complex insurance workflows, ensuring seamless speed-to-market and high operational reliability. This role requires a balance of technical execution and collaborative problem-solving within a purposely non-bureaucratic, values-driven organization.

This guide is scoped to a Software Engineer candidate at Berkshire Hathaway Specialty Insurance.

Berkshire Hathaway Specialty Insurance candidates report 4 rounds over 3-5 weeks. The stages below are what candidates describe, not a published process.

RESTful APIsFull-stack developmentUnit testing

23 min read

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21Practice promptsAcross five skill areas

As a Software Engineer at Berkshire Hathaway Specialty Insurance (BHSI), you play a vital role in building and scaling the digital platforms that drive commercial property, casualty, and specialty insurance products. You contribute directly to modern, full-stack applications and cloud-based ecosystems that support critical business operations, such as SME insurance and travel insurance domains. Your work directly impacts how brokers, customers, and internal teams interact with complex insurance workflows, ensuring seamless speed-to-market and high operational reliability. This role requires a balance of technical execution and collaborative problem-solving within a purposely non-bureaucratic, values-driven organization. You will design, develop, and maintain features across frontend, backend, and data storage layers while upholding rigorous engineering practices like clean code, automated testing, and active code reviews. Whether you are building RESTful APIs, optimizing database interactions, or contributing to technical design discussions, your efforts help shape durable technology foundations that support long-term business growth. You can expect to work within self-sufficient, cross-functional Agile teams alongside product owners and quality engineers. BHSI values individual excellence within a team framework, emphasizing character, collaboration, and a passion for continuous learning.

01

Initial Screening

reported

The first step involves a preliminary assessment to evaluate your qualifications for the role.

What to demonstrate

  • The first step involves a preliminary assessment to evaluate your qualifications for the role
  • Depth in RESTful APIs

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.
Berkshire Hathaway Specialty Insurance Software Engineer candidate reports ↗
02

Technical Assessments

reported

You will undergo various technical evaluations to assess your coding skills and problem-solving abilities.

What to demonstrate

  • You will undergo various technical evaluations to assess your coding skills and problem-solving abilities
  • Depth in RESTful APIs

How to prepare

  • Answer aloud and timed: How have you approached full-stack feature delivery from concept through production in past environments?
  • Answer aloud and timed: What experience do you have designing and building RESTful APIs or service-oriented applications?
Berkshire Hathaway Specialty Insurance Software Engineer candidate reports ↗
03

Behavioral Evaluations

reported

Interviews focused on understanding your interpersonal skills and alignment with company values.

What to demonstrate

  • Interviews focused on understanding your interpersonal skills and alignment with company values
  • Depth in RESTful APIs

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 evaluations above and write down what you would ask to confirm before it.
Berkshire Hathaway Specialty Insurance Software Engineer candidate reports ↗
04

Final Discussions

reported

The concluding stage where final evaluations and discussions about the role take place.

What to demonstrate

  • The concluding stage where final evaluations and discussions about the role take place
  • Depth in RESTful APIs

How to prepare

  • Answer aloud and timed: 1–2 sentences introducing the category and what it tests. These questions test your ability to structure scalable solutions, reason about application layers, and make pragmatic trade-offs.
  • Answer aloud and timed: How would you design a scalable digital platform component to support distributed insurance operations?
Berkshire Hathaway Specialty Insurance Software Engineer candidate reports ↗

PracHub editorial advice for the preparation topics above.

01

Emphasize Simplicity

In technical design and coding discussions, always favor clean, maintainable, and straightforward solutions over complex over-engineering.

02

Know Your Resume

Be prepared to walk through your past projects, technical stack choices, and specific contributions in detail during initial conversations.

03

Demonstrate Collaboration

Highlight how you partner effectively with QA, product owners, and engineering peers to drive projects from concept to production.

Choose a category, try a prompt, then open its approach, worked solution or follow-up when you need it.

14 technical prompts0 include a worked solution

Collapse a redelivered event batch into per-aggregate high-water marks

easy
hashingat-least-onceaggregation

You drain a batch of up to 5,000,000 events, each (aggregate_id BIGINT, aggregate_version INT, event_type, payload). The log guarantees order within one aggregate only; the batch merges 64 partitions, and a relay failover has redelivered a range, so an older version for an aggregate can appear after a newer one. Given a map of last_applied_version per aggregate, produce the events worth applying, at most one per (aggregate_id, version), plus the count discarded. Target O(n) time. State the memory for 2,000,000 distinct aggregates and what you do when it does not fit.

Approach
  1. One pass, one hash map from aggregate_id to the highest version kept, and a discard counter. An event whose version is at or below last_applied_version for its aggregate is dropped without further work, which is the whole reason the event carries its version rather than a delta. O(n) expected time, O(d) space in distinct aggregates.
  2. Keep the maximum, never the last occurrence. The redelivered range means the final appearance of an aggregate in the batch can be an older version than one seen earlier in the same batch, so last-wins applies stale state over newer state and the projection regresses with no error anywhere.
  3. Cost the memory instead of calling it large: an 8-byte key plus a 4-byte version is 12 bytes of payload, and an open-addressed table held at a 0.7 load factor costs roughly 17 bytes per entry before per-slot metadata, so 2,000,000 aggregates is tens of megabytes in a native layout and several times that in a runtime that boxes both key and value.
  4. If the distinct set exceeds memory, partition on hash(aggregate_id) mod P and reduce each partition independently. Every event for one aggregate hashes to the same partition, so the per-partition result is exact and the merge is concatenation rather than a second reduction.
Follow-up
  • The payload is a patch rather than a snapshot, so applying only the highest version loses the intermediate changes. What changes in your reduction?
  • How do you detect that version 7 arrived while version 6 was never delivered, and what should the consumer do about the gap?

Merge partitioned event streams into one ordered feed with bounded lateness

hard
k-way mergewatermarksout-of-order streams

The read-model service consumes 64 log partitions carrying about 4,000 events per second in total. Each partition is ordered within itself, but partitions drift by up to 30 seconds, and the activity feed must present a tenant's events in occurred_at order. Produce the merge. State its complexity, the buffer it requires in events and in bytes, what happens when one partition is idle, and what you do with an event that arrives after you have already emitted its position. Payloads average 1 KB.

Approach
  1. Merge with a min-heap over the 64 partition heads keyed on (occurred_at, event_id): O(log P) per event and O(n log P) overall. The tie-break on event_id is what makes the output deterministic when two partitions carry the same millisecond, which matters because the feed is paginated and a non-deterministic order reorders pages under the reader.
  2. Emitting the heap head is only correct once every partition has produced everything up to that timestamp, so the emit condition is a watermark: the minimum across partitions of the highest occurred_at seen, less the allowed lateness. Events are held until the watermark passes them, which is what turns individually ordered streams into a jointly ordered one.
  3. Size the buffer from the lateness rather than guessing: 4,000 events per second times 30 seconds is 120,000 buffered events, and at 1 KB each about 120 MB of heap. That number is the real price of the ordering guarantee and belongs in front of whoever asked for it.
  4. Handle the idle partition explicitly, because it fails the feed rather than corrupting it: a partition with no traffic never advances its own maximum, so the watermark freezes and output stops entirely. Either every partition emits a periodic idle marker carrying the broker's current time, or the watermark falls back to wall clock for a partition silent beyond a threshold.
Follow-up
  • The lateness budget is raised to five minutes. What is the new buffer, and what besides memory changes?
  • The consumer restarts. Where does it resume from, and what does the feed look like for the first 30 seconds?

Track a rolling failure rate per destination for circuit decisions

easy
sliding windowring buffercircuit breaker

The egress service delivers about 1,500 webhooks per second across roughly 40,000 destinations, each call bounded by a 10 second timeout. Maintain, per destination, the failure rate over the trailing 60 seconds so a caller can ask before dispatch whether the circuit should open. Attempts arrive as (destination_id, finished_at_ms, outcome). Requirement: amortised O(1) per attempt, with total memory bounded by the destination count rather than by traffic. Give the structure, its exact memory, and the rule that stops a destination with three attempts from opening a circuit.

Approach
  1. Name the exact-deque version and then reject it as the default. Holding timestamps and advancing a tail pointer past anything older than now minus 60 seconds is a correct two-pointer window at amortised O(1) per attempt, but its memory tracks in-window traffic, so one destination in a retry storm holds hundreds of thousands of entries while thousands of quiet destinations hold none.
  2. Use a ring of 60 one-second buckets per destination, each bucket a pair of counters for attempts and failures. On an attempt, advance the ring by the elapsed whole seconds, zeroing at most min(elapsed, 60) buckets, then increment the head. That is amortised O(1) with a fixed footprint per destination.
  3. State the footprint: 60 buckets times two 4-byte counters is 480 bytes of payload per destination, so 40,000 destinations is roughly 20 to 25 MB with per-entry overhead, bounded by the catalogue rather than by the rate. The cost is granularity, since the oldest bucket ages out in whole seconds, which is far tighter than the decision needs.
  4. Require a minimum sample before the circuit may open. A destination with three attempts and three failures reads as 100 percent and is not evidence; a floor of roughly 20 attempts in the window makes the ratio meaningful, and below that floor use a run of consecutive failures as the trigger instead.
Follow-up
  • The fleet is 30 instances and each sees roughly a thirtieth of a destination's traffic. Where does the rate actually live, and what does a per-instance answer get wrong?
  • A destination answers in 9.5 seconds and succeeds. It is not failing but it is consuming your per-destination concurrency. What signal should open the circuit here?

Built from the rounds and topics Berkshire Hathaway Specialty Insurance candidates report.

Small steps. Visible outcomes.0 / 7 completed
ONE WEEK · YOUR PACE

Prepare, practise & reflect

One practical outcome each day. Spend longer where you need it.

0 / 7 done
01Map the Berkshire Hathaway Specialty Insurance loop
  • Write out the reported sequence: Initial Screening, Technical Assessments, Behavioral Evaluations, 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 4 reported rounds, with the weakest marked.

02Work RESTful APIs
  • Spend the session on RESTful APIs, which Berkshire Hathaway Specialty Insurance candidates report being tested on.
  • Write one worked example in RESTful APIs and time yourself on it.

Deliverable: One timed worked example in RESTful APIs.

03Work Full-stack development
  • Spend the session on Full-stack development, which Berkshire Hathaway Specialty Insurance candidates report being tested on.
  • Write one worked example in Full-stack development and time yourself on it.

Deliverable: One timed worked example in Full-stack development.

04Work Unit testing
  • Spend the session on Unit testing, which Berkshire Hathaway Specialty Insurance candidates report being tested on.
  • Write one worked example in Unit testing and time yourself on it.

Deliverable: One timed worked example in Unit testing.

05Answer out loud: Technical and Resume-Based Discussions
  • Answer aloud, timed: 1–2 sentences introducing the category and what it tests. This section evaluates your practical hands-on experience, familiarity with specific technology stacks, and your ability to articulate past technical contributions.
  • Answer aloud, timed: Walk me through your work experience, projects, and the specific technologies you used in your previous roles.

Deliverable: Spoken answers to 2 reported Technical and Resume-Based Discussions question(s), under time.

06Answer out loud: System Design and Architecture
  • Answer aloud, timed: 1–2 sentences introducing the category and what it tests. These questions test your ability to structure scalable solutions, reason about application layers, and make pragmatic trade-offs.
  • Answer aloud, timed: How would you design a scalable digital platform component to support distributed insurance operations?

Deliverable: Spoken answers to 2 reported System Design and Architecture question(s), under time.

07Answer out loud: Behavioral and Cultural Alignment
  • Answer aloud, timed: 1–2 sentences introducing the category and what it tests. These inquiries measure how well you collaborate in cross-functional teams, navigate ambiguity, and align with core values like integrity and respect.
  • Answer aloud, timed: Why are you interested in joining BHSI, and how do your values align with our organizational culture?

Deliverable: Spoken answers to 2 reported Behavioral and Cultural Alignment question(s), under time.

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Behavioural rounds judge the decision you made and what it cost.

How do you handle writing and maintaining unit tests as part of your everyday development workflow?

medium
Technical and Resume-Based Discussions

How do you handle writing and maintaining unit tests as part of your everyday development workflow?

Approach
  1. Pick a story where you made the decision, not one where you watched it.
  2. State the situation in two sentences and spend the rest on the reasoning.
  3. Give the blast radius: what could have broken, and what you measured.
  4. 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?

Can you explain your experience working with cloud-based application concepts and distributed systems?

medium
Technical and Resume-Based Discussions

Can you explain your experience working with cloud-based application concepts and distributed systems?

Approach
  1. Pick a story where you made the decision, not one where you watched it.
  2. State the situation in two sentences and spend the rest on the reasoning.
  3. Give the blast radius: what could have broken, and what you measured.
  4. 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?

1–2 sentences introducing the category and what it tests. These inquiries measure how well you collaborate in

medium
Behavioral and Cultural Alignment

1–2 sentences introducing the category and what it tests. These inquiries measure how well you collaborate in cross-functional teams, navigate ambiguity, and align with core values like integrity and respect.

Approach
  1. Pick a story where you made the decision, not one where you watched it.
  2. State the situation in two sentences and spend the rest on the reasoning.
  3. Give the blast radius: what could have broken, and what you measured.
  4. 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?

Why are you interested in joining BHSI, and how do your values align with our organizational culture?

medium
Behavioral and Cultural Alignment

Why are you interested in joining BHSI, and how do your values align with our organizational culture?

Approach
  1. Pick a story where you made the decision, not one where you watched it.
  2. State the situation in two sentences and spend the rest on the reasoning.
  3. Give the blast radius: what could have broken, and what you measured.
  4. 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 collaborated closely with product owners or quality assurance peers to resolve a deli

medium
Behavioral and Cultural Alignment

Describe a time when you collaborated closely with product owners or quality assurance peers to resolve a delivery roadblock.

Approach
  1. Pick a story where you made the decision, not one where you watched it.
  2. State the situation in two sentences and spend the rest on the reasoning.
  3. Give the blast radius: what could have broken, and what you measured.
  4. 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 handle shifting priorities and backlog refinement in an Agile team environment?

medium
Behavioral and Cultural Alignment

How do you handle shifting priorities and backlog refinement in an Agile team environment?

Approach
  1. Pick a story where you made the decision, not one where you watched it.
  2. State the situation in two sentences and spend the rest on the reasoning.
  3. Give the blast radius: what could have broken, and what you measured.
  4. 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 contributed to continuous improvement or shared knowledge within your engineering tea

medium
Behavioral and Cultural Alignment

Tell me about a time you contributed to continuous improvement or shared knowledge within your engineering team.

Approach
  1. Pick a story where you made the decision, not one where you watched it.
  2. State the situation in two sentences and spend the rest on the reasoning.
  3. Give the blast radius: what could have broken, and what you measured.
  4. 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

    How do you handle writing and maintaining unit tests as part of your everyday development workflow?

  • 02

    Can you explain your experience working with cloud-based application concepts and distributed systems?

  • 03

    1–2 sentences introducing the category and what it tests. These inquiries measure how well you collaborate in cross-functional teams, navigate ambiguity, and align with core values like integrity and respect.

  • 04

    Why are you interested in joining BHSI, and how do your values align with our organizational culture?

PracHub preparation framework ↗
How difficult is the interview process, and how much preparation time is typical?

The overall interview difficulty is generally rated as average, but the process is thorough and expects genuine technical competence. Candidates typically spend two to three weeks reviewing their past projects, brushing up on full-stack fundamentals, and preparing system design concepts.

Berkshire Hathaway Specialty Insurance Software Engineer candidate reports ↗
What differentiates successful candidates during the interview loops?

Successful candidates distinguish themselves by demonstrating clear communication, a strong grasp of end-to-end feature delivery, and a collaborative attitude. Interviewers appreciate engineers who favor simple, practical solutions and show a genuine curiosity about the insurance domain.

Berkshire Hathaway Specialty Insurance Software Engineer candidate reports ↗
What is the culture like at Berkshire Hathaway Specialty Insurance?

BHSI operates as a purposely non-bureaucratic organization that values individual excellence within a supportive team framework. The culture emphasizes integrity, respect, action-oriented execution, and always doing the right thing for customers and teammates.

Berkshire Hathaway Specialty Insurance Software Engineer candidate reports ↗
What is the typical timeline from initial screen to offer?

The timeline can vary depending on team requirements and location, but candidates generally progress through initial recruiter screens, hiring manager chats, and team technical rounds over the course of two to four weeks.

Berkshire Hathaway Specialty Insurance Software Engineer candidate reports ↗
Are there opportunities for career growth and mentorship?

Yes, BHSI provides exciting growth opportunities for career-oriented teammates, including tuition reimbursement, knowledge sharing, and pathways to grow into mentorship responsibilities over time as the engineering organization expands.

Berkshire Hathaway Specialty Insurance Software Engineer candidate reports ↗
What topics does Berkshire Hathaway Specialty Insurance test in interviews?

Berkshire Hathaway Specialty Insurance interviews most often cover SQL, Python, Communication (cross-functional), Documentation, and Root Cause Analysis. The exact emphasis depends on the specific role you apply for.

Berkshire Hathaway Specialty Insurance 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.