Senior QA Engineer (Typescript, Blockchain)

We are hiring in Europe!

🟢 At Dev.Pro, a US-based outsourced software development company, we're looking for contractors to join our global team of IT professionals helping tech companies scale their business through software engineering expertise. Operating as a remote-first company, our experts work across 55+ countries on five continents, giving us the flexibility and skillset to deliver high-quality engineering for projects of any size or complexity.
We invite a Senior QA Engineer to join our team and help evolve a large-scale blockchain-based platform for private markets. In this role, you’ll own end-to-end quality assurance, combining hands-on manual testing with building and expanding test automation across backend services, distributed systems, and blockchain integrations. You'll help establish testing approaches and automation practices from the ground up, working closely with engineering teams and business stakeholders to ensure reliable, high-quality releases.

🟩 What's in it for you:
Work on an innovative blockchain platform designed to bring trust and transparency to private markets
Deepen your expertise in blockchain systems, distributed architectures, and complex integrations
Drive the development of test automation frameworks and help shape quality practices across multiple projects

✅ Is that you?
5+ years in QA/SDET roles, covering both manual and automated testing across the full SDLC
Strong experience with backend and non-UI test automation
Hands-on experience developing, maintaining, and debugging automated tests
Strong programming skills for test automation, preferably with TypeScript/Node.js
Ability to define QA strategies, test plans, and quality gates from the ground up
Understanding of blockchain fundamentals, including wallets, transactions, and blockchain types
Experience testing REST APIs and RPC-based interfaces (JSON-RPC, gRPC)
Experience with Docker-based test environments and debugging containerized services
Experience integrating automated tests into CI/CD pipelines and establishing quality gates
Experience with AWS-based infrastructure
Experience with MongoDB or PostgreSQL
Strong analytical and problem-solving skills to identify risks and propose solutions
Ability to independently manage testing activities, take ownership of deliverables, and proactively communicate progress and blockers
Ability to adapt to changing priorities and demonstrate a flexible, hands-on approach to testing
Ability to define testing scope and balance test coverage between QA and engineering teams
Strong communication and collaboration skills across multiple stakeholders and teams
Upper-Intermediate+ English level

Desirable:
Hands-on experience testing blockchain systems, smart contracts, and transaction flows
Experience with Go for test automation
EVM testing experience using Foundry, Hardhat, or similar frameworks
Ability to read and understand Solidity or Rust code for smart contract validation
Experience with Layer 2 solutions and blockchain protocol testing
Experience testing asynchronous messaging systems (AWS SNS/SQS, Azure Service Bus)
Experience with Kubernetes
Experience with observability-driven testing
Experience testing MCP servers
Experience with performance and load testing

🧩Key responsibilities and your contribution
In this role, you'll lead testing activities across blockchain-based applications, from requirements analysis and manual validation to test automation and release support.

Review business requirements and technical documentation to understand system functionality and identify testing needs
Manually test new features and existing functionality to understand system behavior and guide test automation efforts
Define and improve QA strategies, test plans, and quality gates
Establish testing ownership and coordinate responsibilities between QA and engineering teams
Work closely with engineering and product teams to define test coverage and acceptance criteria
Build and maintain automated test suites, frameworks, and test harnesses, focusing on backend, integration, and contract testing
Test blockchain integrations, smart contracts, REST APIs, JSON-RPC endpoints, MCP servers, and other blockchain-specific functionality
Integrate and monitor automated tests within CI/CD pipelines and quality gates
Investigate and troubleshoot issues across distributed systems and blockchain integrations
Adjust testing priorities and approaches as project needs evolve
Maintain test documentation, report quality risks, and communicate testing progress and blockers
Help expand automation coverage and improve QA practices across multiple projects

Our next steps:
✅ Submit a CV in English — ✅ Intro call with a Recruiter — ✅ Internal interview — ✅ Client Interview - ✅ Contract Conditions