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Fiverr Pro
Nederlands
$
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Roman Lapenok
@rlapenok
Backend Developer
Wit-Rusland
Russisch, Engels
Over mij
Hi, I'm Roma — a Backend Developer with 3+ years of experience building scalable backend systems and microservice architectures using Go (Golang).
I develop fast and reliable REST/gRPC APIs, high-load services, and production-ready backend infrastructure. Experienced with PostgreSQL, Redis, ClickHouse, Kafka, RabbitMQ, Docker, CI/CD, and blockchain integrations.
I focus on clean architecture, performance optimization, and maintainable code that scales with business needs.
Skills
Roman Lapenok
offline •
Gemiddelde reactietijd: 1 uur
Bekijk mijn diensten
API en integraties
I will free build scalable golang microservices with grpc, graphql, and rest apis
API en integraties
I will free rest API development only 3 slots left
Werkervaring
Software Developer
Website • Fulltime
Jan 2026 - Jun 2026 • 5 mos
Worked on an educational platform for programming training, contributing to backend architecture, authentication systems, and internal platform services. Independently implemented and customized an IAM solution using Casdoor, building a complete registration and authentication flow based on OAuth 2.0. Designed API interfaces and developed backend business logic for new platform services, including database schema design and service integration. Participated in the implementation of a monitoring and business metrics system using VictoriaMetrics and Grafana, improving visibility into product KPIs and service health. Developed a parser service for processing quest-based educational tasks, converting assignments into structured internal models and accelerating new content integration by 40%. Performed prompt bug fixing, optimization, and code refactoring, reducing platform incidents and maintaining stable operation during active user training sessions.
Software Developer
Blockchain • Fulltime
May 2023 - Dec 2024 • 1 yr 7 mos
Worked on an analytical platform for blockchain networks and crypto wallets, focusing on high-load backend systems and scalable microservice architecture. Designed, developed, and refactored high-performance gRPC and REST APIs in Golang, implementing complex business logic and optimizing system reliability under heavy traffic. Integrated blockchain technologies using go-ethereum, including smart contract interaction, transaction automation, blockchain event monitoring, and Web3 service integration into backend infrastructure. Optimized analytical SQL queries and aggregations in ClickHouse, reducing data processing and report generation time by 50–70%. Built and maintained CI/CD pipelines for fast and reliable deployments, reducing release cycles by 3x and improving development workflow efficiency.
