George Sereda Golang Engineer, 6+ years of experience

I'm a Backend Engineer with 6 years of commercial experience, including 2 years in team leadership.

Data-driven engineer focused on measurable impact - I go beyond shipping features to analyze both technical (SLOs, latency, reliability) and product metrics to assess real business outcomes. Expert in end-to-end software development within Agile, covering business requirements, architecture design, task decomposition and refinement, team management, delivery, CI/​CD, documentation.

Skilled in high-load (30k+ RPS), ensuring system scalability, reliability, and fault tolerance. Built fully automated release pipelines with high test coverage and analytics. Hands-on experience with migrating Golang /​ Python /​ Java /​ PHP monoliths to microservices, load balancing, service orchestration, and DevOps practices. Master in operating multiple roles, not just coding.

Speaker at public events, including Elastic Meetup⁠, Golang comminuty meetups of Amsterdam⁠ and Rotterdam⁠

Professional Experience
Senior Golang Engineer - B2B Team, Dumpert | Mediahuis Netherlands⁠
Jan 2024 – present1 yr 10 mos | Amsterdam, Netherlands
  • •Cut churn 27% by designing, building & launching subscription system: reqs, SaaS API, CI/​CD, release, metrics.
  • •Reduced automated tests runtime from 26 min to 42.2 sec, boosting overall team performance. How did I make it?⁠
  • •Decreased Support turnaround time from ≈42 min to 4.7 min by implementing internal tool. How did I make it?⁠
  • •Eliminated key bug source by introducing first cross-service automated testing flow.

    • Used stack: Golang, Python, DDD, Microservices, GCP, GKE, Kubernetes, Docker, Elasticsearch, Cassandra, PostgreSQL.

    Lead Golang Engineer, ieye.io | Intelligent Eye⁠
    Dec 2022 – Dec 2023 | 1 yr 1 mos | London, UK
  • •Cut time-to-market from 23 to 11 mos by leading backend: reqs, specs, API, coding, reviews & CI/​CD.
  • •Improved geolocation accuracy from 5–7 meters to 0.5 meters by inventing a novel method for calculating geoposition using Bluetooth beacons, enabling a key product feature.

    • Used Stack: Golang, Agile, DDD, Microservice, Amazon Web Services (AWS), Docker, GORM, Elasticsearch, PostgreSQL.

    Golang Engineer - R&D Team, SSV Labs⁠
    Oct 2021 – Dec 2022 | 1 yr 3 mos | New York, USA
  • •Boosted consensus success rate from 60.4% to 92.1% (on average) by optimizing SSV, making it production-ready.
  • •Improved system availability from 90% to 99.9% by introducing proactive production health monitoring and alerting.
  • •Reduced new customer processing time from 12 min to 50 sec by implementing multi-layer cache.

    • Used stack: Golang, AWS, Kubernetes, Kafka, Elasticsearch, PostgreSQL, MongoDB, Docker, Ethereum.

    Java/Kotlin Engineer, SAP Ariba⁠
    Feb 2019 – Oct 2021 | 2 yr 9 mos | Kyiv, Ukraine
    Skills

    Golang, Python, Java, Kotlin, Rust, AWS, Google Cloud (GCP, GKE), Azure, FastAPI, Django, Flask, SQLAlchemy, Celery, Cloudflare, Docker, Kubernetes, Terraform, CI/CD, Nomad, Consul, Vault, GORM, PostgreSQL, MySQL, MongoDB, Redis, Elasticsearch, Cassandra, ScyllaDB, ClickHouse, DynamoDB, Prometheus, Grafana, Jaeger, Apache Kafka, RabbitMQ, NATS, Pulsar, gRPC, GraphQL, REST, WebSockets, Gin, Fiber, Chi, JWT, OAuth2, SOLID, Microservices, ACID, DDD, CQRS, TDD, BFF, N-Tier, MVC, MVVM, Monolithic, SOA, Event-Driven Architecture, Serverless, RESTful, Clean Architecture, Distributed Systems, Agile, Scrum.

    Freelance & Pet
    Founder & Lead Engineer, Musik.co
    Feb 2025 – Present

    • Achieved 1.9x higher user satisfaction vs Spotify's recommendations (user surveys) by architecting AI-powered system using hybrid LLM ensemble (ChatGPT, Claude Sonnet, DeepSeek).

    Used stack: Rust, PostgreSQL, Docker, Kubernetes, ChatGPT & Claude & DeepSeek APIs, CI/​CD.

    Senior Golang Engineer, NDA - Centralized Exchange (CEX)
    Feb 2024 – Feb 2025

    • Drove 10k+ UAM and 3M+ trades/mo at launch by building AI-powered trading bots (Grid, DCA).

    • Achieved 72.3% price prediction accuracy by training custom TensorFlow model.

    • Optimized Match Engine to handle 600-800k orders/sec, enabling high-frequency trading.

    Used stack: Golang, C, Python, TensorFlow, MySQL, Redis, Docker, Kubernetes, WebSockets, Prometheus, Grafana, CI/​CD.

    Aug 2023 – Dec 2024

    • Veteran Subject Matter Expert 2023 & 2024

    • Brought 5000+ customers by authoring "Smart Contract Development" course. Link⁠

    • Brought 1900+ customers by authoring 2 project management courses. Link⁠

    Used stack: Solidity, Blockchain, Smart Contracts, JavaScript, TypeScript, web3.js, Ethereum.

    Aug 2023 – Feb 2024

    • Enabled mainnet launch by migrating Ethereum L2 fork from PoW to PoS with legacy tooling.

    • Built complete L2 infrastructure: architecture design, bridge integration, contract deployment.

    Used stack: Golang, Rust, Solidity, Ethereum, Geth, Lighthouse, Prysm, Hardhat, Web3.js, PostgreSQL, AWS, Terraform, Docker, Kubernetes, CI/​CD, Kurtosis.

    Education
    Bachelor's degree, Computer Science, National Technical University of Ukraine 'Kyiv Polytechnic Institute'
    Sep 2021 – Jun 2025 | Kyiv, Ukraine