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Senior QA Engineer - Crypto

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Sokin

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Location:
Serbia , Belgrade

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Category:
IT - Software Development

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Contract Type:
Not provided

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Salary:

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Job Description:

We’re seeking a Senior QA Engineer to drive end-to-end quality for our crypto-enabled product area, embedding quality practices into the engineering team (“shift left”) and ensuring high confidence releases in a regulated environment. This is a hands-on role requiring strong automation skills (TypeScript E2E), deep understanding of crypto transaction lifecycles and failure modes, and the ability to use modern (including AI-assisted) testing approaches to improve coverage, speed, and signal quality.

Job Responsibility:

  • Embed quality “shift-left” practices into the delivery team: clarifying acceptance criteria, defining test strategy, and influencing design for testability and observability
  • Own end-to-end testing for crypto transaction flows across UI, API, and back-end services, including happy paths and high-risk failure scenarios
  • Validate crypto operations and lifecycle states (e.g., signing → broadcast → mempool → confirmations/finality → settlement), including handling of retries, idempotency, and reconciliation
  • Design, maintain, and continuously improve automated E2E tests written in TypeScript (e.g., Playwright), including enforcing code quality standards via linters and consistent review practices
  • Maintain and improve CI/CD execution of automated suites (gating, reporting, flaky test management, parallelisation, and environment stability)
  • Execute strong API testing practices (contract testing where applicable), covering authentication/authorisation, limits, validation rules, and error handling
  • Test non-functional requirements relevant to regulated crypto products: resilience, performance, monitoring/alerting behaviour, auditability, and production readiness
  • Partner with Product, Engineering, Compliance/Risk, and Operations to ensure controlled releases, traceable evidence, and clear go/no-go criteria
  • Contribute to test tooling and diagnostics, including reading/debugging services and test utilities in Python and/or Go as needed (log analysis, helpers, data generation, integration harnesses)
  • Apply AI-assisted testing pragmatically (e.g., generating/maintaining test ideas and cases, log triage, exploratory support), while managing risks such as hallucinations, data leakage, and over-reliance
  • Drive continuous improvement via root cause analysis, defect trend insights, and prevention-focused actions (not just detection)

Requirements:

  • 3-5 years of experience in QA/test automation, with strong ownership of quality outcomes in modern product teams (Senior level expectation)
  • Practical experience testing crypto or digital-asset products in production (or equivalent depth via a regulated fintech handling crypto rails)
  • Strong understanding of how to test crypto transaction products end-to-end, across multiple transaction types and operations
  • Strong knowledge of crypto concepts and “weak points” in regulated environments, including: Transaction lifecycle realities
  • Address risk
  • Custody/key management controls
  • Third-party/node/provider risk
  • Compliance expectations
  • Hands-on experience maintaining and running automated E2E tests written in TypeScript (e.g., Playwright), including code quality enforcement via linters (e.g., ESLint/Prettier) and stable CI execution
  • Working ability to read, debug, and contribute to test tooling and/or services written in Python and/or Go (e.g., integration harnesses, data builders, diagnostic tooling)
  • Strong API testing capability (REST/JSON
  • event-driven where relevant), including negative testing, schema/contract validation, and authZ/authN coverage
  • Experience integrating automated tests into CI/CD (e.g., GitHub Actions, Jenkins, or equivalent), including reporting, gating, and triage of flaky tests
  • Familiarity with cloud environments (AWS or equivalent) and the practicalities of test environments
  • Practical use of AI in testing: ability to use AI tools to improve coverage and speed (test design, exploratory support, log/trace triage)
  • Strong analytical thinking, clear written communication, and ability to work cross-functionally
  • Experience in regulated fintech/financial services with knowledge of crypto is required
  • Candidates will need to have the right to work in the jurisdiction that they are looking to work in
What we offer:
  • Inclusive work environment
  • Agility and flexibility in working culture
  • Accommodations during the recruitment process available upon request

Additional Information:

Job Posted:
February 17, 2026

Work Type:
Hybrid work
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