Open to opportunities

Евгений Колосков

@0003683

Senior backend engineer building microservices and high-performance Go systems with Node.js, NestJS, and deep networking.

Russian Federation

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What I'm looking for

I’m looking for a team that builds microservices with strong engineering discipline—clear contracts, observability, and performance. I want to keep shipping backend features while also working on Go-based high-throughput systems and networking.

I’m a backend engineer with 5 years of experience building microservice architectures in Node.js / TypeScript / NestJS, and I focus on reliable, observable systems. In my current role, I designed and shipped 3 microservices from scratch in 6 months, using a schema-first contract system (JSON Schema / OpenAPI) and delivering fixes that cut release delay by 2 weeks.

I care about operational excellence: I completed 100+ code reviews across cross-functional teams, set up distributed tracing with OpenTelemetry + Grafana, and reduced mean time to diagnose incidents from hours to minutes. I also built a Telegram bot-based authentication flow and introduced production metrics via Prometheus + Grafana in earlier work.

Alongside product development, I build high-performance networking systems in Go. My traffic filtering & bot-mitigation side project achieves 100,000+ RPS, uses raw sockets for TCP packet parsing, manages kernel-level nftables sets, and delivers p99 latency under 5 ms with profiling-driven zero-allocation hot paths.

Experience

Work history, roles, and key accomplishments

Current

Senior Backend Developer

Current

Rosa Khutor Resort (LLC)

Apr 2025 - Present (1 year 3 months)

Designed and shipped three microservices within six months to support core resort infrastructure during peak season. Built a schema-first contract system (JSON Schema/OpenAPI) and implemented distributed tracing with OpenTelemetry and Grafana to reduce incident diagnosis time.

NestJS TypeScript PostgreSQL RabbitMQ OpenTelemetry Grafana OpenAPI Code Review

Middle+ NestJS Backend Developer

FSK Leader

Dec 2023 - Apr 2025 (1 year 4 months)

Built an agent sales platform handling 10,000+ agents and hundreds of transactions per day in the real-estate segment. Implemented a two-way 1C ERP integration, optimized critical SQL queries, and delivered Telegram-based authentication with metrics via Prometheus and Grafana.

NestJS TypeScript Sequelize PostgreSQL Keycloak Prometheus Grafana SSE Jest

Backend Developer (Node.js)

Digital League of Economy

Mar 2023 - Dec 2023 (9 months)

Built a survey distribution system for Ingosstrakh (email and SMS), improving throughput and performance at peak load. Implemented an automated OSAGO policy renewal flow using a Kafka-based saga pattern, along with Redis caching for reference data.

Fastify PostgreSQL Oracle Kafka Redis Docker

Backend Developer (JavaScript/TS)

ITooLabs

Feb 2022 - Mar 2023 (1 year 1 month)

Developed core business logic for a high-load VoIP platform, including SIP call routing, distribution, and failover across operator trunks. Migrated a JavaScript codebase to TypeScript over six months and contributed to RTP traffic mirroring for analytics and QA.

JavaScript TypeScript NestJS RabbitMQ Go PostgreSQL MongoDB Docker Kubernetes

Go Systems Developer

Independent (Self-employed)

Built a high-throughput traffic filtering and bot-mitigation system in Go with kernel-level packet routing via nftables/netfilter. Implemented TCP/TLS fingerprinting, behavioral heuristics, challenge-response flows, and rate limiting, achieving low latency and high RPS.

Go Nftables Linux Pprof Sync.Pool TCP TLS Fingerprinting Rate Limits