Senior Node.js Developer

• 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.
• Practical understanding of:
• HTTP/1.1 and HTTP/2
• WebSocket
• TLS
• HTTP headers
• Caching
• Compression
• Ability to troubleshoot real-world networking problems.
• Experience designing modular systems with:
• Clean boundaries
• Dependency Injection
• Type-safe contracts
• Maintainable code structures
• Strong understanding of scalable application architecture.
• Experience with:
• Unit testing
• Integration testing
• End-to-end testing
• Comfortable using TDD as a practical engineering tool.
• Strong knowledge of SQL databases.
• Experience with ORM frameworks and database migrations.
• Understanding of indexes, transactions, and performance optimization.
• Experience with monitoring, logging, and tracing.
• Familiarity with CI/CD pipelines and monorepo workflows.
• Understanding of production environments and performance under load.

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.

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.

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.

• 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.
• 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.
• Implement tracing, metrics, and logging using OpenTelemetry.
• Build dashboards and alerts generated directly from code.
• Analyze system behavior under load and improve operational visibility.
• Maintain and extend runtime integrations with external web applications.
• Develop compatibility layers between internal systems and third-party clients.
• 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.
• Own projects end-to-end:
• Research
• Design
• Planning
• Development
• QA
• Documentation
• Retrospectives
• Leverage AI tools as an integral part of the engineering workflow.

• TypeScript (strict mode)
• Node.js
• Bun
• pnpm Workspaces
• Turborepo
• BiomeJS
• HTTP/1.1
• HTTP/2
• WebSocket
• TLS
• Circuit Breakers
• Load Balancing
• REST APIs
• OpenAPI
• RFC 9457 Problem Details
• SQL
• Drizzle ORM
• Database Migrations
• Hexagonal Architecture
• OpenTelemetry
• Prometheus
• Grafana
• SigNoz
• VictoriaMetrics
• Docker
• Kubernetes
• Helm
• GitLab CI
• React 19+
• Ant Design
• Vite
• TanStack Query
• AES-256-GCM
• HKDF
• HMAC Signatures
• JWT / RBAC
• SSRF Protection
• Rate Limiting
• Vitest
• Bun Test
• Playwright