Nagy Elemer

Senior Full Stack Developer | API Design

Salary / Daily rate

Warsaw, Poland

Freelance, open to permanent contract

Skills

Fullstack DevelopmentReact

Languages

English

About me

Intro

Senior Full Stack Developer with 10+ years delivering scalable web solutions and API design expertise. Led teams to achieve 20% performance improvements and 96% test coverage while managing AWS infrastructure for high-traffic applications. Specialized in JavaScript/TypeScript, Python, and modern frameworks with proven results in user engagement growth.

Links

Work experience

Senior Full Stack Developer

Wonder

Nov 2023 - May 2025

1 year 7 months

- Led the development of the company's web site, ensuring scalability and high performance. - Collaborated with product managers and designers to build intuitive, user-friendly solutions. - Managed and mentored a team of three developers, delivering a key feature that increased customer engagement by 20%. - Implemented responsive design, optimizing the platform for mobile and tablet users. - Enhanced application performance, improving load time and overall user experience by 20%. - Applied Agile methodologies to streamline development workflows, ensuring timely delivery. - Established a robust testing strategy, achieving 96% test coverage across the codebase.

Full Stack Developer

The APP Solutions

Apr 2020 - Oct 2023

3 years 7 months

- Developed and maintained core features in a large-scale web application, focusing on a scalable backend architecture. - Collaborated with the QA team to identify and resolve software issues, ensuring a high level of quality. - Extended application functionality by integrating third-party APIs and optimizing existing features. - Managed and optimized AWS infrastructure, including EC2 instances, S3 storage, and RDS databases, improving system reliability.

Software Engineer

Tallium Inc.

Nov 2018 - Mar 2020

1 year 5 months

- Built responsive, high-performance websites, ensuring cross-browser compatibility and seamless user experiences. - Optimized SEO strategies, leading to a 15% increase in organic traffic and search engine visibility. - Developed and maintained front-end components using React.js, delivering scalable and maintainable code. - Designed and implemented RESTful and GraphQL APIs, improving data exchange efficiency and system interoperability. - Implemented unit testing to improve code quality and maintainability.

Full Stack Engineer

8allocate

Aug 2017 - Oct 2018

1 year 3 months

- Developed and maintained both front-end and back-end components of web applications. - Designed and optimized database queries, improving data retrieval performance and system efficiency. - Actively participated in Agile development cycles, contributing to regular sprints and delivering key features on schedule.

Full Stack Developer

WeSoftYou Inc.

Jan 2016 - Jul 2017

1 year 7 months

- Designed and developed RESTful APIs to support high-traffic applications and seamless data exchange. - Implemented a responsive user interface, increasing user engagement by 50%. - Developed efficient data storage solutions and optimized database queries for improved performance.

Junior Web Developer

DevIT

Jul 2014 - Dec 2015

1 year 6 months

- Assisted in the development and maintenance of websites and applications, ensuring adherence to best coding practices. - Contributed to database design and query optimization, improving data management and retrieval speed. - Worked with the development team to troubleshoot and enhance application functionality, improving system stability.


Education

Kyiv Polytechnic Institute

Bachelor's degree

2010 - 2014

3 years 11 months

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