Senior Software Engineer, Quality Engineering (SDET) at Startale Development (BVI) Ltd – Japan | Jobyssey

Design and build testing architecture, automation frameworks, developer tooling, CI/CD integrations, and AI-powered quality systems across backend services, frontend applications, blockchain integrations, and trading infrastructure.

Responsibilities

Design and evolve the quality engineering platform
Define unit, integration, contract, API, and end-to-end testing architecture
Build reusable testing frameworks, shared libraries, fixtures, and developer tooling
Design deterministic test data generation and management strategies
Build AI-assisted quality engineering workflows
Build LLM-based systems for test generation, maintenance, failure analysis, root cause identification, and regression detection
Build automated test suites for APIs, backend services, frontend applications, and blockchain interactions
Integrate automated testing into CI/CD pipelines and implement quality gates
Optimize test execution through parallelization, test selection, caching, and infrastructure improvements
Validate trading flows, order matching, execution paths, routing logic, fee calculations, and settlement
Verify consistency between backend services, blockchain state, and frontend behavior
Develop load, stress, endurance, and resilience testing
Validate system behavior during failures, timeouts, and outages
Improve system observability and production issue investigation
Collaborate with Backend, Frontend, Blockchain, DevOps, and Product teams
Mentor engineers on automated testing and quality engineering

Requirements

Write clean, maintainable, production-quality software
Build scalable automation frameworks and reusable testing libraries from scratch
Have 5+ years of experience in SDET, quality engineering, test automation, or software engineering
Have strong JavaScript or TypeScript skills
Have experience with Playwright or Cypress
Have experience testing REST, JSON-RPC, GraphQL, WebSocket, or similar APIs
Have experience integrating automated testing into CI/CD pipelines
Have experience with Docker and containerized testing environments
Have strong communication and cross-disciplinary collaboration skills

Explore more jobs

Responsibilities

Requirements