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Serokell

Senior SDET (QA Automation, TypeScript)

Serokell
France · Contract · Mid-Senior
We are looking for a Senior SDET (QA Automation) to join a team of fierce and fun Serokellers and ensure the stability, performance, and reliability of a blockchain-based solution.

Currently, we do not have open roles, and our hiring process is passive, with a focus on building a talent pool for future opportunities. Hiring Process Overview: We invite interested candidates to fill in a form. Within a few months of completing the form, we conduct an HR screening with those whose profiles align with our requirements. When a position opens, we reach out to candidates who performed well in both stages and match the specific role needs, and invite for a technical interview.

Responsibilities

  • Own QA automation from pre-launch through post-launch stabilization.
  • Build and maintain TypeScript-first test suites (Playwright, Jest, Node-based tooling).
  • Design scalable API, UI, and CLI test coverage with reliable signals at scale.
  • Integrate tests into CI/CD (GitHub Actions, Docker; parallel pipelines) and enforce quality gates.
  • Create and manage containerized test environments (Docker, K8s) and test data.
  • Validate functional correctness and protocol interoperability; verify critical on-chain/user flows (when in scope).
  • Author and maintain manual and automated test cases where needed; keep documentation current.
  • Log, triage, track, and re-test defects in the agreed issue tracker.
  • Drive release readiness reviews and sign-off processes.
  • Collaborate closely with developers and DevOps; use advanced Git workflows.
  • Perform security testing and contribute to secure-by-default test coverage.
  • Support fast diagnosis and fixes for critical issues during stabilization after release.

Requirements

  • 5+ years of QA in blockchain or fintech.
  • Strong TypeScript automation expertise (Playwright, Jest, Node-based frameworks).
  • Deep understanding of TypeScript fundamentals, SOLID principles, and core data structures.
  • Proven experience with API / UI / CLI automation at scale.
  • Security testing experience.
  • CI/CD integration experience (GitHub Actions, Docker; parallel pipelines).
  • Advanced Git proficiency.

Nice-to-have

  • Rust familiarity.
  • Performance and load testing (k6).
  • Smart contract / DApp QA (Hardhat, Foundry, ethers.js, viem).
  • Web3 QA on major chains (Ethereum, Bitcoin, Solana, etc.).
  • Blockchain node and RPC testing, event verification.
  • Containerized test envs (Docker, K8s).

What We Offer

  • Competitive salary.
  • Attractive international projects.
  • Participation in the leading world conferences.
  • International teams and multicultural environment.
  • Fully remote work and flexible working hours.
  • Possibility to take days off at any time you need
  • Investment in your professional and career growth, which will correspond to wage growth.
  • Mentoring and training.
  • Opportunity to contribute to one of the functional programming industry’s leading blogs.
  • Therapy sessions to support your well-being.

By joining Serokell, you’ll become part of a warm community of ingenious engineers, computer scientists, designers, marketers, and other inventive people. You’ll take part in ambitious projects that build the next generation of computer software, explore bold initiatives free from bureaucracy, and enjoy our Slack channels that range from #music to #butthurt (did we mention our extensive custom emoji set?).

Key Skills

Ranked by relevance

docker typescript blockchain git ui functional programming devops slack cicd
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Country Guide

France

Large economy with strong startup and AI ecosystem

Posted
Dec 07, 2025
Type
Contract
Level
Mid-Senior
Location
Paris
Company
Serokell

Industries

Software Development

Categories

Engineering Information Technology

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