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How Fastly Interviews in 2026: Process, Sample Questions & What They Score

The complete process, sample questions, and what interviewers score.

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Fastly / Interview snapshot

6

stages from
application to offer

42

reported questions

26

public sources

Last verifiedSep 2026
HOW TO READ THIS PLAYBOOK

Independent: SupaCV is not affiliated with or endorsed by Fastly. This is one well-documented shape of Fastly's interviews, not a script: processes change and vary by role, team, level, and region, so confirm specifics with your recruiter.

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01 / For every Fastly candidate

The process, start to finish.

Fastly is an edge cloud and CDN platform, and this playbook covers the track it is best known for: platform and systems engineering (edge protocols, caching, networking, security products), with a secondary note on its large customer-facing Customer Solutions Engineering track, since both dominate its open roles. Fastly does not publish an interview-process page.

The stage-by-stage structure below comes from a coaching guide that reconstructs candidate reports (recruiter call, technical screen, onsite of roughly 45-minute rounds, a collaborative problem-solving session, and sometimes a final leadership conversation), consistent with aggregate candidate data showing an average of three rounds and a response within one to two weeks.

Fastly does publish eight company values on its careers page, and those are listed here exactly as published, as the only official framework; Fastly publishes no interview rubric that maps questions to those values, so no question is asserted to map to one.

Technical content is grounded in Fastly's own live job descriptions: C, C++ and Rust with TLS, HTTP and QUIC for edge protocol roles; Go for security-product and backend API roles; Go, AWS/GCP, Docker, Kubernetes and Terraform for platform roles; TCP/IP, BGP, Anycast and DNS for network SRE roles; and HTTP, TLS, DNS, Varnish/VCL and HLS/DASH for customer solutions engineering. Candidate-reported questions skew heavily toward caching internals, protocol state machines, concurrency and distributed-systems design rather than puzzle trivia.

Stage 1:

Initial recruiter call

about 30 minutes

Screening conversation covering interest in the role, background, work culture and values, plus logistics such as location preference and work arrangement.

Stage 2:

Technical screening

varies

Video call led by a hiring manager or senior engineer, focused on live coding and problem solving, plus discussion of past projects and the technical decisions behind them. The source states the format but gives no duration; length varies by role and interviewer.

Stage 3:

Onsite interviews

about 45 minutes per round, multiple rounds

Several one-on-one rounds mixing technical and behavioral content: systems programming, distributed systems and performance optimization on the technical side; teamwork, communication and values alignment on the behavioral side. The number of rounds varies by team and level.

Stage 4:

Collaborative problem-solving session

varies

Part of the onsite in some loops: a coding or design problem worked through jointly with interviewers, to observe approach and communication rather than only the final answer. Not reported for every candidate.

Stage 5:

Final interview with senior leadership or cross-functional partners

varies

Described as happening in some cases only, covering long-term career goals, culture fit and contribution to the mission. Whether it happens varies by role and seniority.

Stage 6:

Decision and response

1 to 2 weeks after the last interview

Aggregate self-reported data: the average respondent completed 3 rounds and heard back within 1 to 2 weeks (67 percent said 1 to 2 weeks, 33 percent said within a week). Sample size is small (this breakdown reflects only 3 respondents), so treat as directional.

Reported interview time, one scale in minutes

Where the minutes go

  • Initial recruiter call~30 min
  • Onsite interviews~45 min

Not drawn: Technical screening, Collaborative problem-solving session, Final interview with senior leadership or cross-functional partners and Decision and response, whose durations are not given in minutes.

02 / What Fastly scores

Fastly company values

  1. 01

    Have a curious spirit

  2. 02

    Focus on our customer

  3. 03

    We are trustworthy

  4. 04

    Act with passion

  5. 05

    Operate with integrity

  6. 06

    We are competitive

  7. 07

    Embrace transparency

  8. 08

    We are good people

These eight values are published on Fastly's official careers page and appear here word for word and in the exact published order (https://www.fastly.com/about/careers). A third-party company profile (builtin.com) independently lists the same eight (curious spirit, customer focus, trustworthiness, passion, integrity, competitiveness, transparency, good people), describing them as outlined in Fastly's Code of Business Conduct.

Fastly does not publish an interview rubric, scoring scale, or any mapping from interview questions to these values, and no source shows an interviewer assessing a named value. Behavioral rounds are reported to assess "how you align with Fastly's values" in general terms only (an exact quote from the interviewquery.com guide). For that reason no question below is mapped to a value: no mapping is asserted where none is published.

03 / Coach's notes

Coach's tips.

The coach's tips are part of Interview Prep, which is included with Career.

04 / The research

Where this page comes from.

Compiled from public sources across 10 sites. Fastly's own page is among them: fastly.com/about/careers.

sites
10
coaching and prep guides
23
Fastly's own pages
3

Source composition

Where the research comes from

Grouped by the kind of site that published each source: Fastly's own domain, candidate forums, and everything else.

  • Coaching and prep guides23
  • Fastly's own pages3

05 / The questions

Sample questions, by category.

Roles in the full set

Roles are grouped by the category each question fits, not by the source. Switching roles is part of Interview Prep, included with Career. The counts show what each role holds in the full set.

  1. Sample question, Coding and data structures

    Find the median of two sorted arrays.

    Tests binary-search partitioning of two arrays to hit O(log(m+n)) instead of a naive merge.

  2. Sample question, Caching, concurrency and protocols

    Let me know how you would manage concurrent reads and writes in a custom LRU implementation

    Tests locking strategy and eviction-policy design for thread-safe LRU cache access.

  3. Sample question, Behavioral and values

    I want to know what you learned from your major failure at work.

Showing 3 of 42 reported questions. The rest are in Interview Prep.

Practice Fastly questions in Interview Prep

Interview Prep is included with Career. Add Fastly as a Target Role and it builds an 8-question practice session from Fastly's reported questions, scores your answers, and adds the coach's tips.

Start free: score your resume, no credit card. Prep for Fastly comes next, in Interview Prep on Career.

Score your resume, then prep for FastlyCompare plans

Common questions

Quick answers.

How many stages are in Fastly's interview process?

Fastly has 6 stages, set out in The process.

What framework does Fastly use to evaluate candidates?

Fastly evaluates candidates against Fastly company values, set out in What Fastly scores.

What kinds of questions does Fastly ask?

Fastly's questions fall into 4 categories, grouped in The questions.

How reliable is this Fastly interview playbook?

It is compiled from public sources, and the evidence is in The research.

Sources (26)

Every public source this page was compiled from. Links open in a new tab.

10 sites, by sources

  • prepfully.com9
  • boards-api.greenhouse.io6
  • fastly.com3
  • interviewquery.com2
  • comparably.com1
  • builtin.com1
  • indeed.com1
  • algodaily.com1
  • simplify.jobs1
  • en.wikipedia.org1
  1. 01fastly.com/about/careers
  2. 02fastly.com/about/careers/current-openings
  3. 03boards-api.greenhouse.io/v1/boards/fastly/jobs
  4. 04boards-api.greenhouse.io/v1/boards/fastly/jobs/8010849
  5. 05boards-api.greenhouse.io/v1/boards/fastly/jobs/8128535
  6. 06boards-api.greenhouse.io/v1/boards/fastly/jobs/8045052
  7. 07boards-api.greenhouse.io/v1/boards/fastly/jobs/8011076
  8. 08boards-api.greenhouse.io/v1/boards/fastly/jobs/7733190
  9. 09fastly.com/about
  10. 10interviewquery.com/interview-guides/fastly-software-engineer
  11. 11interviewquery.com/interview-guides/fastly
  12. 12prepfully.com/interview-questions/fastly/software-engineer
  13. 13prepfully.com/interview-questions/fastly/software-engineer
  14. 14prepfully.com/interview-questions/fastly/software-engineer
  15. 15prepfully.com/interview-questions/fastly/software-engineer
  16. 16prepfully.com/interview-questions/fastly/software-engineer
  17. 17prepfully.com/interview-questions/fastly/software-engineer
  18. 18prepfully.com/interview-questions/fastly/software-engineer
  19. 19prepfully.com/interview-questions/fastly/software-engineer
  20. 20prepfully.com/interview-questions/fastly
  21. 21comparably.com/companies/fastly/interviews
  22. 22builtin.com/company/fastly/faq/culture-values
  23. 23indeed.com/cmp/Fastly/faq/hiring-process
  24. 24algodaily.com/companies/fastly
  25. 25simplify.jobs/c/Fastly
  26. 26en.wikipedia.org/wiki/Fastly

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