Senior NodeJS Developer

About the Role We are looking for a Senior Node.js Developer to join our team and help build a distributed, high-load real-time networking platform that processes, transforms, and routes large volumes of HTTP and WebSocket traffic between clients and external services. This is a highly technical engineering role focused on network services, protocol-level development, observability, runtime integrations, and modern software architecture. Our platform is built as a large TypeScript monorepository running simultaneously on both Node.js and Bun, with a unified abstraction layer. We actively embrace AI-assisted development practices and expect engineers to take ownership throughout the entire software lifecycle—from research and design to implementation, testing, deployment, and continuous improvement. What You'll Do Core Platform Development Design, develop, and optimize services within our networking core. Build highly reliable systems for request processing, routing, load balancing, failover, and streaming data delivery. Contribute to platform scalability, performance, and operational excellence. Network Protocol Engineering Work directly with: HTTP/1.1 HTTP/2 WebSocket TLS CONNECT tunneling Compression technologies (gzip, brotli, zstd, deflate) Diagnose and resolve complex networking issues in production environments. Observability & Reliability Implement tracing, metrics, and logging using OpenTelemetry. Build dashboards and alerts generated directly from code. Analyze system behavior under load and improve operational visibility. Third-Party Integrations Maintain and extend runtime integrations with external web applications. Develop compatibility layers between internal systems and third-party clients. Software Engineering Excellence Write portable TypeScript code compatible with both Node.js and Bun runtimes. Ensure proper tree-shaking, modular design, and absence of cyclic dependencies. Participate in architecture discussions and technical decision-making. Full Ownership Delivery Own projects end-to-end: Research Design Planning Development QA Documentation Retrospectives Leverage AI tools as an integral part of the engineering workflow. 5+ years of commercial experience with TypeScript and JavaScript. Strong expertise in Node.js development. Deep understanding of: Asynchronous programming Event loops Streams Error handling High-performance backend systems Experience designing and maintaining production-grade services. Networking Knowledge Practical understanding of: HTTP/1.1 and HTTP/2 WebSocket TLS HTTP headers Caching Compression Ability to troubleshoot real-world networking problems. Software Architecture Experience designing modular systems with: Clean boundaries Dependency Injection Type-safe contracts Maintainable code structures Strong understanding of scalable application architecture. Testing & Quality Experience with: Unit testing Integration testing End-to-end testing Comfortable using TDD as a practical engineering tool. Databases Strong knowledge of SQL databases. Experience with ORM frameworks and database migrations. Understanding of indexes, transactions, and performance optimization. DevOps & Observability Experience with monitoring, logging, and tracing. Familiarity with CI/CD pipelines and monorepo workflows. Understanding of production environments and performance under load. Highly Valued Experience Reverse Engineering & Web Client Analysis We highly value engineers who have experience working with third-party web applications and browser internals, including: Reading and understanding minified or obfuscated JavaScript bundles. Reverse engineering application behavior without source code. Network traffic analysis using HAR files and proxy tools. Debugging HTTP/2 and WebSocket traffic. Browser instrumentation and runtime code injection. Working with Service Workers and modern SPA architectures. Cross-browser testing using Playwright and BrowserStack. AI-Assisted Development We actively build our engineering processes around AI-assisted development practices. We are looking for engineers who: Use AI critically and responsibly. Verify generated code and recommendations. Follow structured workflows from research to implementation. Understand security considerations when working with AI tools. Take ownership of outcomes rather than relying blindly on generated solutions. Tech Stack Core TypeScript (strict mode) Node.js Bun Monorepo & Tooling pnpm Workspaces Turborepo BiomeJS Networking HTTP/1.1 HTTP/2 WebSocket TLS Circuit Breakers Load Balancing Backend REST APIs OpenAPI RFC 9457 Problem Details Data Layer SQL Drizzle ORM Database Migrations Hexagonal Architecture Observability OpenTelemetry Prometheus Grafana SigNoz VictoriaMetrics Infrastructure Docker Kubernetes Helm GitLab CI Frontend (Admin Panel) React 19+ Ant Design Vite TanStack Query Security AES-256-GCM HKDF HMAC Signatures JWT / RBAC SSRF Protection Rate Limiting Testing Vitest Bun Test Playwright 20 vacation days and 5 family days yearly Flexible start to the workday Support from a professional corporate coach and psychologist Regular internal and external activities, workshops, trips, and corporate events Access to our internal knowledge base, meetups, and team-building activities Ongoing training in new technologies and continuous professional development support