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 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:

• 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.

Requirements

• 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:

• and
• WebSocket
• TLS
• 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 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

• 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

Benefits

• 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