Looking for a job

Daniil Rozhok

@daniilrozhok

Experienced Full Stack Software Engineer building scalable web and mobile systems with real-time functionality and reliable APIs.

Ukraine

Message

What I'm looking for

I’m looking for a role where I can build scalable web/mobile products, own real-time features (WebSocket/WebRTC), and deliver reliable REST/GraphQL APIs—while writing clean code, improving performance, and tackling meaningful architecture challenges.

I’m an experienced Full Stack Software Engineer with approximately 5 years of professional experience designing and developing scalable web and mobile applications. I focus on the JavaScript/TypeScript ecosystem, with deep expertise in React, React Native, Next.js, and Node.js (NestJS).

I specialize in building high-traffic systems and delivering real-time functionality using WebSocket and WebRTC, plus reliable APIs through REST and GraphQL. I bring a strong foundation in performance optimization, clean code, and complex architectural problem-solving.

Across projects, I’ve built and maintained GraphQL API layers, implemented real-time collaboration and financial data pipelines, and designed backend pagination, caching strategies, and stable authentication flows. I also work with PostgreSQL and MongoDB, Redis caching, and cloud infrastructure like AWS and Firebase—partnering closely with product and design to ship impactful features.

Experience

Work history, roles, and key accomplishments

Full Stack Software Engineer

Confidential Fintech Project

Designed and implemented real-time financial data pipelines using WebSockets and backend aggregation services, supporting market data, transactions, and portfolio management. Built NestJS backend APIs and optimized mobile performance for large datasets and complex financial charts, including a JWT/refreshtoken authentication refactor and Redis/React Query caching.

React Native Redux toolkit React Query NestJS WebSockets PostgreSQL Redis JWT CI CD Firebase

Full Stack Software Engineer

Acceptic

Developed backend services for IoT device communication and real-time updates, including device provisioning orchestration and telemetry/device management APIs. Implemented synchronization logic using polling plus event-driven flows, with offline handling, retry strategies, and improved frontend API interaction.

Next.js React Query Zustand WebSockets Firebase PostgreSQL Offline Retry Strategies

Full Stack Software Engineer

Miro

Migrated product features to the web platform using shared backend services, improving system stability and test coverage. Built and maintained a GraphQL API layer and implemented real-time collaboration with WebSockets, including backend pagination and caching strategies.

React GraphQL WebSockets AWS S3 Redis Caching Strategies

Full Stack Software Engineer

Babyjourney

Built backend capabilities for real-time chat and WebRTC-based video consultations, enabling real-time updates via WebSockets. Implemented push and in-app notifications and optimized API responses for mobile usage to improve engagement and reliability.

React Native WebRTC WebSockets PostgreSQL Firebase Push Notifications Real Time Systems

Full Stack Software Engineer

Internal Admin Platform (E-commerce)

Built an internal admin platform for managing products, orders, and users, including backend services for catalog, pricing, and inventory. Implemented role-based access control, REST and GraphQL APIs for frontend integration, and background jobs for order processing and notifications, with CI/CD deployment setup.