Node.js developer

Prof-IT (https://prof-it.bz/) is an international IT company that has been successfully developing, launching, and scaling high-tech projects for over 12 years. We specialize in building innovative fintech and Web3 solutions, including crypto exchanges, wallets, and blockchain protocols. Currently, we are looking for a skilled Node.js / Nest.js Developer to join our core crypto project development team. If you thrive on technical challenges, clean architecture, and cutting-edge technologies, we’d love to have you on board!

Requirements:

• 1) Deep understanding of JavaScript and the ability to comfortably use TypeScript.
• 2) More than 2 years of commercial experience with Node.js.
• 3) More than 1 year of experience with the Nest.js framework.
• 4) Deep understanding of asynchrony and the principles of concurrent programming.
• 5) Intuitive understanding of SOLID and KISS. Awareness of GoF and other design patterns (or the ability to organically derive clean architectural solutions yourself).
• 6) Clear understanding of how and why Dependency Injection (DI) and DI containers work.
• 7) Experience with message queues like RabbitMQ / Kafka (specific technology is less important than understanding the pattern and use cases).
• 8) Strong experience with relational databases (PostgreSQL / MySQL). Experience with non-relational DBs is a plus.
• 9) Deep understanding of ACID, transactions, isolation levels, and locking mechanisms (row-level, table-level, deadlocks).
• 10) Database optimization skills: indexing, query profiling. Experience with window functions and temporary tables is a big plus.
• 11) Intuitive understanding of normal forms and knowing when denormalization is appropriate.
• 12) Ability to work with databases fluently at both the ORM level and via raw SQL queries.
• 13) Ability to utilize Redis appropriately.
• 14) Experience with WebSockets.
• 15) Hands-on experience with Docker and Docker Compose (at the level of spinning up the local environment and project dependencies).
• 16) Basic understanding of cryptography: distinguishing and correctly applying encryption, hashing, and digital signatures.

Nice to Have:

• 17) Practical experience with AI coding assistants (e.g., GitHub Copilot, Cursor) to accelerate development, while maintaining complete control over code quality and architecture.
• 18) Experience in building highly loaded, consistent systems.
• 19) Framework-agnostic approach: the ability to write clean code without heavy reliance on frameworks, or the agility to adapt to new ones quickly.
• 20) The ability to write clean, modular code that can be used for years on different projects with minimal changes.
• 21) Understanding of Web3 specifics: from blockchain data indexing to reliable raw transaction broadcasting.

We offer:

• Trial period — 1 month;
• Remote work;
• 8 hours working day;
• 10 working days of paid leave for 6 months;
• 10 paid sick days per year;
• If there is demand and ambition, career growth is possible.