HubMub
-
Serokell

Middle SDET (TypeScript, Web3)

Serokell
France · Contract · Entry
We are looking for a Middle SDET (QA Automation) to join a team of fierce and fun Serokellers and help ensure the stability, reliability, and quality 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

  • Support QA activities from pre-launch through stabilization after release.
  • Build and maintain TypeScript-first automation (Playwright, Jest, Node-based tooling).
  • Design API, UI, and CLI test coverage with reliable, actionable signals.
  • Integrate tests into CI/CD (GitHub Actions, Docker; basic pipelines) and keep them green.
  • Collaborate with engineers/DevOps to provision containerized test environments and, when needed, ephemeral testnets.
  • Author and maintain manual and automated test cases; keep test docs current.
  • Log, triage, track, and re-test defects in the agreed issue tracker.
  • Participate in release readiness reviews and sign-off.
  • Use Git proficiently in day-to-day work (branching, merges, rebases, conflict resolution).

Requirements

  • 3+ years of QA in blockchain or fintech.
  • TypeScript test automation experience (Playwright, Jest, Node-based frameworks).
  • Solid understanding of core data structures.
  • Hands-on API / UI / CLI automation.
  • CI/CD integration experience (GitHub Actions, Docker; basic pipelines).
  • Git proficiency (branching, merges, rebases, conflict resolution).

Nice-to-have

  • Rust familiarity.
  • Performance and load testing (k6).
  • Security testing.
  • 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, ephemeral testnets).

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 blockchain ui functional programming typescript slack cicd git
Login to Apply
🇫🇷

Country Guide

France

Large economy with strong startup and AI ecosystem

Posted
Dec 06, 2025
Type
Contract
Level
Entry
Location
Paris
Company
Serokell

Industries

Software Development

Categories

Engineering Information Technology

Related Jobs

3 roles aligned with this opportunity

View all jobs
View Job Details
In Tandem
Related

Product Data Scientist

2026-06-16

Full-time
Associate
France
Technology
Engineering
View Job Details
Flix
Related

Junior Java/Kotlin Engineer (m/f/d) - Station Management & Inventory

2026-06-13

Full-time
Not Applicable
Germany
Software Development
Engineering
View Job Details
Digital Waffle
Related

Back End Developer

2026-06-12

Full-time
Mid-Senior
Germany
Data Infrastructure
Analyst