Денис

Denis Yakovlev | Full-Stack Developer
Ukraine, Kremenchuk | [open contact info](look above in the "contact info" section) Email: [open contact info](look above in the "contact info" section)
LinkedIn: [open contact info](look above in the "contact info" section) Telegram: t.me/Denis_YakovIev

PROFILE SUMMARY
Full-stack dev with 3+ years of experience and a Master’s degree in Computer Science;
Focused on backend in Python, frontend in JS/TS, mobile development with React Native;
Worked on startups, AI agent apps, ERP systems, developed projects end to end from scratch;

SKILLS
Languages: English (Upper-Intermediate), Ukrainian (Native), Russian;
Programming Languages: Python, JavaScript, TypeScript;
Backend: Django, FastAPI, Express;
Frontend: React, React Native, Next.js;
Databases: PostgreSQL, SQLite, Redis, Firebase;
DevOps: Docker, Docker Compose, CI/CD (GitHub Actions, AWS CodePipeline);

WORK EXPERIENCE
Jun 2024 - Dec 2025 | Solwey Consulting | Full-stack Developer
Sep 2025 – Dec 2025 | Web apps for AI agents training
Tech stack: Python, TypeScript, FastAPI, React, SQLite, MapLibre GL (offline maps);
Improved search performance by 4x through SQL query optimization;
Achieved 100% search correctness on raw data by making automated tests covering 50k+ cases;
Resolved database migrations & seeding issues by rewriting git commit history with Python scripts;

May 2025 – Sep 2025 | ERP system
Tech stack: Python, JavaScript, FastAPI, Next.js, PostgreSQL, GraphQL, Redis, Celery;
Modified an open-source library to build a custom client for complex GraphQL database queries;
Used AI to simplify and enhance work with 2000+ pages of 25+ year old system documentation;
Optimized large data tables with 100+ columns to improve web app performance;

Jun 2024 – May 2025 | Universal messenger mobile app
Tech stack: TypeScript, JavaScript, React Native, Express, Firebase, Next.js, MongoDB;
Implemented mobile app state management with data caching and incoming message processing;
Designed database schemas to support a complex contacts system;
Implemented complex UI components including a message composer, image viewer and chat screen;

Jan 2023 – Jun 2024 | Psycholebedenko | Full-stack Developer
Psycholebedenko - Web app and Telegram-based platform for consulting and psychological services.
Tech stack: Python, Django REST Framework, Telebot, Celery, React, PostgreSQL, Redis;
Built and launched a web app, Telegram bot and Telegram Mini App from scratch;
Designed backend services, frontend integration, database schemas, deployed the system to AWS;
Integrated an existing React web app into a Telegram Mini App environment;

EDUCATION
2019 - 2023 | Bachelor’s Degree in Software Engineering
National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
2023 - 2025 | Master’s Degree in Computer Science
Kremenchuk Mykhailo Ostrohradskyi National University