Boosty Labs

Our customer  is a leading team behind the development of the first Bitcoin sidechain with full EVM compatibility, focused on enabling smart contract functionality on Bitcoin. Their mission is to drive financial inclusion through decentralized infrastructure built on top of the world’s most secure blockchain.

We’re seeking an experienced Senior QA Engineer with expertise in blockchain testing, particularly for Bitcoin and L2 technologies. In this role, you’ll take ownership of the quality and security of our cross-chain multi-actor bridge protocol, applying both manual and automated testing strategies to validate its robustness, performance, and resistance to misuse.

• Requirements:
  • 5+ years of QA engineering experience, including at least 2 years in blockchain technology (Bitcoin experience is a major plus)
  • Strong proficiency in test automation frameworks and tools
  • Experience with scripting languages such as TypeScript and Python, used for automated testing, integration workflows, and scripting blockchain interactions
  • Understanding of Bitcoin Core technologies and transaction models
  • Knowledge of native Bitcoin scripting (e.g., P2SH, P2WSH) and hands-on experience testing smart contracts in EVM-compatible environments like RSK using Hardhat or Truffle
  • Experience testing API endpoints and blockchain interfaces
  • Strong knowledge of software testing methodologies (manual, automated, unit, integration, security)
  • Experience with BDD techniques (e.g., Cucumber, Gherkin)
  • Understanding of distributed systems and asynchronous processes
  • Upper-Intermediate English level
• Nice-to-have:
  • Experience testing cross-chain bridges or similar interoperability solutions
  • Experience with blockchain transaction monitoring and validation
  • Proficiency with blockchain testing tools and frameworks
  • Understanding of cryptographic principles and security testing methodologies
  • Knowledge of performance and load testing for blockchain applications
  • Experience with CI/CD tools (e.g., Jenkins, GitHub Actions)
  • Familiarity with Bitcoin Improvement Proposals (BIPs) and RSK Improvement Proposals (RSKIPs)
• Responsibilities:
  • Design and implement comprehensive test strategies for our multi-actor bridge infrastructure
  • Develop and maintain automated test frameworks using TypeScript (with Playwright or WebdriverIO) for end-to-end testing, Python for integration and API tests, and blockchain-specific tools such as Bitcoin Test Framework, RSK Regtest, and Hardhat for smart contract validation
  • Perform in-depth manual testing of bridge functionalities, with a strong focus on edge cases, adversarial scenarios, and security-critical flows such as peg-in/peg-out validation, timeouts, actor disputes, and replay resistance
  • Create detailed test plans and test cases for peg-in and peg-out mechanisms between Bitcoin and RSK
  • Create and maintain test environments that replicate production-like conditions, using tools like Regtest, public testnets, and setups involving external actors or bridge participants
  • Work closely with developers to investigate issues, reproduce bugs, and verify fixes across environments
  • Document testing procedures, results, and identified issues in detail
  • Participate in code reviews from a QA perspective, providing insights on testability, reliability, and potential edge cases
  • Review and contribute to improvements in CI/CD testing pipelines
• What we offer:
  • Remote working format 
  • Flexible working hours
  • Informal and friendly atmosphere
  • The ability to focus on your work: a lack of bureaucracy and micromanagement
  • 20 paid vacation days
  • 7 paid sick leaves
  • Education reimbursement
  • Free English classes
  • Psychologist consultations

• Recruitment process:

  Recruitment Interview – Technical Interview – Customer interview – Customer Technical Interview

Boosty Labs is one of the most prominent outsourcing companies in the blockchain domain. Among our clients are such well-known companies as Ledger, Consensys, Storj, Animoca brands, Walletconnect, Coinspaid, Paraswap, and others.

About project: Advanced blockchain analytics and on-the-ground intelligence to empower financial institutions, governments & regulators in the fight against cryptocurrency crime

• Requirements:
  • 6+ years of experience with Python backend development
    Solid knowledge of SQL (including writing/debugging complex queries)
    Understanding of data warehouse principles and backend architecture
  • Experience working in Linux/Unix environments
    Experience with APIs and Python frameworks (e.g., Flask, FastAPI)
  • Experience with PostgreSQL
  • Familiarity with Docker
  • Basic understanding of unit testing
  • Good communication skills and ability to work in a team
  • Interest in blockchain technology or willingness to learn
  • Experience with CI/CD processes and containerization (Docker, Kubernetes) is a plus
  • Strong problem-solving skills and the ability to work independently
• Responsibilities:
  • Integrate new blockchains, AMM protocols, and bridges into the our platform
  • Build and maintain data pipelines and backend services
  • Help implement new tools and technologies into the system
  • Participate in the full cycle of feature development – from design to release
  • Write clean and testable code
  • Collaborate with the team through code reviews and brainstorming
• Nice to Have:
  • Experience with Kafka, Spark, or ClickHouse
  • Knowledge of Kubernetes, Terraform, or Ansible
  • Interest in crypto, DeFi, or distributed systems
  • Experience with open-source tools
  • Some experience with Java or readiness to explore it
• What we offer:
  • Remote working format 
  • Flexible working hours
  • Informal and friendly atmosphere
  • The ability to focus on your work: a lack of bureaucracy and micromanagement
  • 20 paid vacation days
  • 7 paid sick leaves
  • Education reimbursement
  • Free English classes
  • Psychologist consultations

• Recruitment process:

  Recruitment Interview – Technical Interview

Our client is a crypto platform that enables institutions to participate in digital assets through custody, staking, trading, governance, settlement, and the industry’s leading security infrastructure.

• Project stack:

  Golang, Docker, Kubernetes, GCP

• Requirements:

  • Proficient in Golang
  • Experience with  gRPC, Docker, Kubernetes, and GCP
  • Strong understanding of wallet functionalities, including: how signing works and parameters needed to ensure validity on-chain (e.g., replay protection, fees, interactions with accounts/programs/coins)
  • Node-based scanning processes for retrieving account info, balances, transactions, block events, and mapping these to balance changes
  • Ability to navigate and understand open-source code, especially for protocol-level integrations.
  • Skilled in writing efficient, isolated tests and familiar with CI/CD tools to ensure test pass rates

   

• Responsibilities:

  • Write clean, well-documented, and readable code
  • Address feedback on pull requests efficiently
  • Develop isolated tests and ensure code passes through CI/CD pipelines.
  • Debug issues effectively to identify root causes across various environments.
  • Ensure live systems and testing stages function as expected without regressions
  • Work on wallet-related functionalities
  • Implementing secure signing mechanisms
  • Ensuring validity on-chain with replay protection and proper fee handling
  • Direct scanning from nodes for account and transaction data
  • Adapt integration strategies based on insights from open-source protocol code

   

• What we offer:

  • Remote working format
  • Flexible working hours
  • Informal and friendly atmosphere
  • The ability to focus on your work: a lack of bureaucracy and micromanagement
  • 20 paid vacation days
  • 7 paid sick leaves
  • Education reimbursement
  • Free English classes
  • Psychologist consultations

• Recruitment process:

  Recruitment Interview — Technical Screen — Client Screen — Coding Session — System Design Session

Our client is the world’s largest people-powered marketplace, connecting over 14 million users across 140+ countries to move, save, and store money – even without a bank account.
Founded in 2015 and based in the United States, offers safe, fast, and reliable access to the global economy through cryptocurrencies bought and sold on a borderless peer-to-peer payment network.
With over 500 payment methods for accessing Bitcoin, USDT, and other popular digital and local currencies, company is building a financial system connecting the world’s 5 billion underbanked to global opportunity.

Requirements:

• 5+ years of experience in administering and tuning Amazon RDS
• Deep understanding of PostgreSQL replication techniques, data warehouse design, and performance troubleshooting
• Proven experience with high availability and disaster recovery techniques
• Experience with database management in the microservice architecture
• Proven experience with automation tools based on Ansible/Terraform/scripts to manage databases and migrations

Nice to have:
 

• Past experience with other database technologies such as No SQL database systems is a plus
• Experience with MongoDB and/or Kafka
• Experience with the CI/CD solutions
• Experience with ETL processes, data pipelines and data integration through APIs, Airflow etc
• Experience or interest in cryptocurrency, blockchain and/or financial technology

Responsibilities:
 

• Work closely with the BI team and help maintain and develop more metrics insights
• Continuously evaluate and improve monitoring practices, introducing enhancements that boost platform scalability, reliability, and performance
• Develop and proactively review the monitoring of PostgreSQL database production
• Participate in database design and data modeling and provide recommendations for improvement or optimizations
• Provide query/index optimizations
• Ensure database availability and performance
• Mentor other engineers in developing efficient SQL queries
• Prepare automation related to database deployment and migrations
• Assist in developing data migrations
• Optimize AWS RDS and help reduce cost

What we offer:

• Remote working format
• Flexible working hours
• Informal and friendly atmosphere
• The ability to focus on your work: a lack of bureaucracy and micromanagement
• 20 paid vacation days
• 7 paid sick leaves
• Education reimbursement
• Free English classes
• Psychologist consultations

Our client has built a digital asset trading infrastructure for institutional investors. Client's seamless end-to-end platform connects to global crypto exchanges, custodians, and liquidity providers, via a single Application Programming Interface (API).
Built by industry experts with decades of combined experience in investment management and digital
technology. Our client provides market infrastructure at scale, enabling financial institutions, neobanks, and corporations to access digital asset markets quickly and efficiently.

We are looking for an engineer who will help build connections to exchanges & trading venues, custodians etc., to allow trading. Hands-on experience with trading and building API (as well as FIX) connections to trading venues/exchanges would be highly preferred.
 

Requirements:

• 5+ years of hands-on commercial experience with GO.
• Experience in the crypto space, including CeFi and/or DeFi platforms.
• Background in financial services (buy-side or sell-side).
• Proven experience designing client-facing APIs.
• Experience working in cloud-based and containerized environments (e.g., Docker, Kubernetes).
• Proficient in building and consuming APIs using REST, WebSockets, and/or FIX protocols.
• Solid understanding of data structures and algorithms.
• Excellent software design and debugging skills.
• Bachelor’s degree in Computer Science, Mathematics, Electrical Engineering, or a related technical field 

Nice to have:

• Building performant low-latency systems
• Performance testing distributed systems
• Messaging/streaming technologies
• Execution, order, or portfolio management systems
• Building monitoring dashboards using technologies such as the Prometheus and Grafana

Responsibilities:

• Design, build and enhance our extensive API based services written in Golang.
• Contribute and encourage API adoption both internally and externally.
• Help write comprehensive end to end feature tests and examples based on the API.
• Support platform integration with Exchanges, Brokers, OTC Platforms.
• Work with engineers, designers, product managers and senior leadership to ensure constant improvement and quality assured delivery.
• Monitor and support all production system components

What we offer:

• Remote working format 
• Flexible working hours
• Informal and friendly atmosphere
• The ability to focus on your work: a lack of bureaucracy and micromanagement
• 20 paid vacation days
• 7 paid sick leaves
• Education reimbursement
• Free English classes
• Psychologist consultations

Recruitment process: Recruitment interview - Technical interview - Client Interviews

Our project is a Shopping Tool for Effortless Reselling. This model allows shoppers to know upfront how much they can resell an item for within a specified period, typically up to five years. When ready to sell, users can initiate the process through the app or browser extension, ship the item using provided labels, and receive instant payouts via cash or store credit.

Requirements: 

• Proficiency with Angular 20 and TypeScript
• Strong knowledge of MongoDB and RESTful APIs
• Experience deploying and managing solutions on AWS (EC2, Lambda, S3, etc.)
• Solid understanding of agile development practices
• Excellent problem-solving and communication skills

Nice to have:
• Experience with CI/CD pipelines
• Familiarity with unit testing and test-driven development
• Knowledge of containerization (e.g., Docker)

Responsibilities:

• Design, develop, and maintain web applications using Angular 20 and TypeScript
• Build and optimize back-end services with MongoDB
• Deploy and manage applications in the AWS cloud ecosystem
• Collaborate with product and design teams to translate requirements into functional code
• Participate in agile ceremonies, code reviews, and continuous improvement initiatives
• Ensure performance, scalability, and security of all applications

What we offer:

• Remote working format 
• Flexible working hours
• Informal and friendly atmosphere
• The ability to focus on your work: a lack of bureaucracy and micromanagement
• 20 paid vacation days
• 7 paid sick leaves
• Education reimbursement
• Free English classes
• Psychologist consultations

Recruitment process: Recruitment interview - Technical interview - Client Interview