Open to opportunities

Nikita Dobrenko

@nikitadobrenko

Full-stack Node.js and React developer focused on performance, refactoring, and reliable testing for production web platforms.

Lithuania

Message

What I'm looking for

I’m looking for remote opportunities where I can maintain and improve production web platforms, deliver performance optimisation, refactor legacy systems, strengthen testing and QA workflows, and use clear documentation to help teams ship with confidence.

I’m a full-stack Node.js/React developer experienced in maintaining and improving large production web platforms and internal tools. I’ve driven measurable impact through refactoring and performance optimisation (build times 10m→4.5m, API response 536ms→347ms) and improved search query performance, while increasing test coverage and strengthening documentation practices used by both engineers and product owners.

In fintech and high-traffic environments, I refactored legacy codebases, introduced the Repository Pattern across services, and built secure authorisation/authentication flows with Nest.js and Ory Keto. I also focus on reliability end-to-end—writing and maintaining unit tests with Jest, designing QA workflows and PR processes, and delivering cross-platform compatibility initiatives across web, Electron, and mobile browser contexts.

Experience

Work history, roles, and key accomplishments

Current

Frontend Developer

Current

GOCOWS

Mar 2025 - Present (1 year 4 months)

Delivered 20+ production features for web, desktop, and mobile platforms across RTC, messaging, media sharing, and recommendation systems. Introduced automated frontend testing to a long-running codebase, and improved QA workflows, ticket templates, and PR processes to reduce development rework.

React Automation Testing Jest WebRTC Messaging Systems UI Testing QA Processes PR Processes

Full Stack (MERN) Developer

FXC Intelligence

Nov 2023 - Mar 2025 (1 year 4 months)

Maintained and evolved production Node.js/React internal tools for a fintech data platform. Refactored legacy services using the Repository Pattern, improved authorization/authentication with Nest.js and Ory Keto, and wrote Jest unit tests with technical documentation and end-to-end Jira ticket ownership.

Node React TypeScript Jest Ory Keto Authentication Authorization PostgreSQL MariaDB Docker GitHub Actions Unit Testing

Full Stack (MERN) Developer

SoftServe

Nov 2020 - Nov 2023 (3 years)

Supported and extended a large-scale educational platform (Pluralsight) using Node.js and React. Refactored legacy frontend and backend code to reduce UI build times, optimized database queries, improved unit tests and overall test coverage, and produced technical documentation used by engineers and product owners.

React TypeScript Jest PostgreSQL MongoDB Docker Performance Optimization Refactoring Unit Testing Technical Documentation

Backend Developer

Ciklum

Sep 2018 - Aug 2019 (11 months)

Maintained and improved Node.js backend services for a high-traffic travel platform (Thomas Cook). Refactored a legacy search microservice to improve ElasticSearch query performance, reduced response times, increased backend test coverage with unit tests, and delivered an internal knowledge-sharing session on RabbitMQ.