Caris Life Sciences · Software Engineer
Updated · 2026-10-02

Caris Life Sciences Software Engineer
Interview Guide

THE 60-SECOND BRIEF

A Software Engineer at Caris Life Sciences plays a critical role in the revolution of precision medicine. Caris Life Sciences is a leading innovator in molecular science and artificial intelligence, focused on delivering actively personalized medicine to cancer patients. As an engineer in this space, you are not just writing code; you are building the highly scalable data pipelines, advanced laboratory information management systems (LIMS), and clinical trial matching platforms that process massive genomic, transcriptomic, and proteomic datasets. The impact of your work is direct and profound. The software systems you design and maintain enable pathologists, oncologists, and researchers to interpret complex molecular profiles, helping them make life-saving treatment decisions for patients worldwide.

This guide is scoped to a Software Engineer candidate at Caris Life Sciences.

Caris Life Sciences candidates report 3 rounds over 3-5 weeks. The stages below are what candidates describe, not a published process.

Technical interview (general)Technical interview preparationProblem solving skills

23 min read

Browse Software Engineer questions

See the practice prompts

18Practice promptsAcross five skill areas

A Software Engineer at Caris Life Sciences plays a critical role in the revolution of precision medicine. Caris Life Sciences is a leading innovator in molecular science and artificial intelligence, focused on delivering actively personalized medicine to cancer patients. As an engineer in this space, you are not just writing code; you are building the highly scalable data pipelines, advanced laboratory information management systems (LIMS), and clinical trial matching platforms that process massive genomic, transcriptomic, and proteomic datasets. The impact of your work is direct and profound. The software systems you design and maintain enable pathologists, oncologists, and researchers to interpret complex molecular profiles, helping them make life-saving treatment decisions for patients worldwide. This requires a unique blend of robust software engineering, high-throughput data processing, and a deep commitment to quality and compliance in a regulated healthcare environment. Whether you are optimizing cloud infrastructure to handle petabytes of genetic data, developing intuitive interfaces for clinical teams, or integrating machine learning models into live clinical workflows, the engineering challenges here are both technically complex and deeply meaningful. You will collaborate closely with bioinformaticians, clinical scientists, and product managers to translate cutting-edge science into production-grade software.

01

Recruiter Phone Screen

reported

A standard 30-minute call to discuss your background, experience with engineering tools, and salary expectations.

What to demonstrate

  • A standard 30-minute call to discuss your background, experience with engineering tools, and salary expectations
  • Depth in Technical interview (general)

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.
Caris Life Sciences Software Engineer candidate reports ↗
02

Technical Phone Screen

reported

A 1-hour interview with a hiring manager or VP focusing on technical discussions, architectural concepts, and a deep dive into your resume.

What to demonstrate

  • A 1-hour interview with a hiring manager or VP focusing on technical discussions, architectural concepts, and a deep dive into your resume
  • Depth in Technical interview (general)

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.
Caris Life Sciences Software Engineer candidate reports ↗
03

Virtual On-Site Interview

reported

Multiple rounds with different team members covering deep technical design questions and behavioral assessments.

What to demonstrate

  • Multiple rounds with different team members covering deep technical design questions and behavioral assessments
  • Depth in Technical interview (general)

How to prepare

  • Answer aloud and timed: Walk me through the most technically challenging software project you have designed and implemented. What were the bottlenecks, and how did you resolve them?
  • Answer aloud and timed: Tell me about a time you had to refactor a legacy system. What was your strategy for ensuring zero downtime or data loss?
Caris Life Sciences Software Engineer candidate reports ↗

PracHub editorial advice for the preparation topics above.

01

Know your resume inside out

Because the technical evaluations are deeply rooted in your past experience, you should be ready to discuss any technology, framework, or architectural pattern mentioned on your resume. Be honest about your contributions and ready to explain the "why" behind your choices.

02

Emphasize practical scalability

When discussing system design, focus on real-world constraints such as data consistency, network latency, security, and cost-efficiency rather than purely theoretical models.

03

Show passion for the mission

Caris Life Sciences is dedicated to fighting cancer. Expressing a genuine interest in how your software engineering skills can contribute to precision medicine and patient care will set you apart from other candidates.

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

12 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?

Find overlapping job attempts and peak concurrency from lease records

medium
sweep lineintervalsleases

A day of job_run history yields about 50,000,000 attempt records: (job_run_id, job_type, attempt, started_at, finished_at which is NULL when the worker died, lease_expires_at). Leases expire on a clock, so a job that outran its lease ran twice. Produce (a) every job_run_id whose attempts overlapped in wall-clock time and (b) the peak number of simultaneously running attempts per job_type with the minute it occurred. Target O(n log n). State how you treat a NULL finished_at and what clock skew does to your answer.

Approach
  1. Define the interval before sorting anything: an attempt occupies [started_at, COALESCE(finished_at, lease_expires_at)). finished_at is observed and lease_expires_at is only a promise, so every attempt without a finish contributes an estimate and the whole result is a lower bound on overlap rather than an exact count.
  2. For peak concurrency, sweep: emit 2n endpoints, sort by (timestamp, kind) with ends ordered before starts at equal timestamps, then walk the sequence maintaining a counter per job_type and record each type's maximum with its timestamp. O(n log n) dominated by the sort, O(n) space, or O(1) extra if the sort is external and the walk streams.
  3. For overlap detection, do not compare attempts pairwise. A single global sort by (job_run_id, started_at) gives both the grouping and the order; within a group, keep the maximum end seen so far and report an overlap exactly when the next start is less than that running maximum, which is one linear pass after the sort.
  4. Half-open intervals matter and are easy to get wrong: with closed intervals an attempt ending at the same millisecond another begins reads as concurrency two, and across 50,000,000 records that artefact swamps the real signal.
Follow-up
  • A handler is not idempotent and you have found 400 overlapping jobs. Which of them actually caused damage, and what would you query to find out?
  • Peak concurrency for one job_type is 4 against a configured cap of 4. Is the cap working, or is the data hiding attempts that never started?

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 Caris Life Sciences 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 Caris Life Sciences loop
  • Write out the reported sequence: Recruiter Phone Screen, Technical Phone Screen, Virtual On-Site 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 3 reported rounds, with the weakest marked.

02Work Technical interview (general)
  • Spend the session on Technical interview (general), which Caris Life Sciences candidates report being tested on.
  • Write one worked example in Technical interview (general) and time yourself on it.

Deliverable: One timed worked example in Technical interview (general).

03Work Technical interview preparation
  • Spend the session on Technical interview preparation, which Caris Life Sciences candidates report being tested on.
  • Write one worked example in Technical interview preparation and time yourself on it.

Deliverable: One timed worked example in Technical interview preparation.

04Work Problem solving skills
  • Spend the session on Problem solving skills, which Caris Life Sciences candidates report being tested on.
  • Write one worked example in Problem solving skills and time yourself on it.

Deliverable: One timed worked example in Problem solving skills.

05Answer out loud: Practical Technical Experience & Tooling
  • Answer aloud, timed: What software engineering tools, frameworks, and languages are you currently using in your day-to-day work, and why?
  • Answer aloud, timed: How do you approach choosing the right database (SQL vs. NoSQL) for a high-throughput, data-heavy application?

Deliverable: Spoken answers to 2 reported Practical Technical Experience & Tooling question(s), under time.

06Answer out loud: Resume & Project Deep Dives
  • Answer aloud, timed: Walk me through the most technically challenging software project you have designed and implemented. What were the bottlenecks, and how did you resolve them?
  • Answer aloud, timed: Tell me about a time you had to refactor a legacy system. What was your strategy for ensuring zero downtime or data loss?

Deliverable: Spoken answers to 2 reported Resume & Project Deep Dives question(s), under time.

07Answer out loud: Behavioral & Collaboration
  • Answer aloud, timed: Tell me about a time you had to collaborate with non-technical stakeholders, such as scientists or product managers, to define system requirements.
  • Answer aloud, timed: How do you handle disagreements with other engineers regarding technical design or code reviews?

Deliverable: Spoken answers to 2 reported Behavioral & Collaboration question(s), under time.

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

Describe your experience with cloud platforms (like AWS or Azure) and how you have deployed scalable services

medium
Practical Technical Experience & Tooling

Describe your experience with cloud platforms (like AWS or Azure) and how you have deployed scalable services in the cloud.

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 had to refactor a legacy system. What was your strategy for ensuring zero downtime or

medium
Resume & Project Deep Dives

Tell me about a time you had to refactor a legacy system. What was your strategy for ensuring zero downtime or data loss?

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 had to collaborate with non-technical stakeholders, such as scientists or product man

medium
Behavioral & Collaboration

Tell me about a time you had to collaborate with non-technical stakeholders, such as scientists or product managers, to define system requirements.

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 disagreements with other engineers regarding technical design or code reviews?

medium
Behavioral & Collaboration

How do you handle disagreements with other engineers regarding technical design or code reviews?

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 a project's requirements changed mid-way through development. How did you adapt and ensur

medium
Behavioral & Collaboration

Describe a time when a project's requirements changed mid-way through development. How did you adapt and ensure successful delivery?

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 do you want to transition your software engineering skills into the biotech and precision medicine space a

medium
Behavioral & Collaboration

Why do you want to transition your software engineering skills into the biotech and precision medicine space at Caris Life Sciences?

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

    Describe your experience with cloud platforms (like AWS or Azure) and how you have deployed scalable services in the cloud.

  • 02

    Tell me about a time you had to refactor a legacy system. What was your strategy for ensuring zero downtime or data loss?

  • 03

    Tell me about a time you had to collaborate with non-technical stakeholders, such as scientists or product managers, to define system requirements.

  • 04

    How do you handle disagreements with other engineers regarding technical design or code reviews?

PracHub preparation framework ↗
Is there a LeetCode style coding round in the interview process?

No, candidates have reported that the Caris Life Sciences interview process does not typically involve abstract LeetCode-style algorithmic puzzles. Instead, the focus is heavily on your practical experience, system design skills, and your ability to discuss and defend the technical decisions on your resume.

Caris Life Sciences Software Engineer candidate reports ↗
Do I need a background in biology or bioinformatics to apply?

No, a formal background in biology is not required. However, you must demonstrate a strong curiosity and willingness to learn about molecular science, oncology, and precision medicine, as you will be working closely with scientists and medical professionals.

Caris Life Sciences Software Engineer candidate reports ↗
What is the typical timeline for the interview process?

The initial stages of the process, including the recruiter screen and the hiring manager interview, often move very quickly. However, candidates have occasionally reported longer wait times for feedback after the virtual on-site. It is highly recommended to follow up proactively with your recruiter.

Caris Life Sciences Software Engineer candidate reports ↗
What is the remote work policy for software engineers?

While Caris Life Sciences has major offices and laboratories in locations like Phoenix, AZ, and Irving, TX, many software engineering positions support remote or hybrid work arrangements depending on the specific team and project requirements.

Caris Life Sciences Software Engineer candidate reports ↗
What topics does Caris Life Sciences test in interviews?

Caris Life Sciences interviews most often cover Statistical Foundations, Account Executive sales skills, Data Analytics / Metrics Focus, Technical interview (general), and Data Integration. The exact emphasis depends on the specific role you apply for.

Caris Life Sciences 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.