Leszek Janecki
Senior Full-Stack Engineer
Wrocław
Summary
Senior Full-Stack Engineer with over 8 years of experience building scalable, high-performance web applications. Expert in modern JavaScript/TypeScript ecosystems, React/Next.js frontends, and diverse backend technologies including Node.js, .NET, Laravel/PHP, and WordPress. Proven track record of leading end-to-end development, API design (REST & GraphQL), cloud deployments on AWS, and implementing robust CI/CD pipelines. Passionate about clean architecture, security, and delivering maintainable solutions in remote and hybrid environments.
Overview
8
8
years of professional experience
Work History
Full-Stack Engineer
Coherent Solutions
01.2023 - Current
- Lead full-stack development of complex web applications, utilizing TypeScript, React, and Next.js to deliver responsive, high-performance user interfaces.
- Design and maintain backend systems with Node.js, .NET integrations, and PHP, paired with advanced database management in PostgreSQL and MySQL.
- Build and integrate REST and GraphQL APIs, manage AWS cloud deployments, and oversee CI/CD pipelines, security best practices, and scalability optimizations.
- Drive end-to-end engineering ownership, ensuring high-quality code, performance, and maintainability across the stack.
Full-Stack Developer
Graffino
10.2020 - 12.2022
- Specialized in frontend development using React, Next.js, Vue.js, and TypeScript to create dynamic, user-centric interfaces.
- Developed robust backend solutions with Laravel/PHP, Node.js, and custom WordPress integrations, emphasizing headless CMS architectures.
- Designed and implemented REST and GraphQL APIs, ensuring seamless integration and optimal performance across full application lifecycles.
- Contributed to full web application architecture, from initial planning to deployment and ongoing maintenance.
Full-Stack Developer
Smultron Web Development
07.2018 - 09.2020
- Delivered end-to-end web development for dozens of client projects, handling requirements gathering, implementation, and deployment.
- Collaborated closely with clients to translate business needs into high-quality, maintainable codebases.
- Built responsive frontends with React and modern JavaScript, integrated with WordPress/WooCommerce backends and REST APIs.
- Ensured projects met high standards for performance, accessibility, and scalability.
Education
Bachelor of Science - Computer Science
Poznan University of Technology
Poznan, Poland 05.2001 -
Skills
JavaScript
TypeScript
Reactjs
Nextjs
Vuejs
Nodejs
MongoDB
GraphQL
MySQL
PostgreSQL
REST APIs
HTML5
CSS
WordPress
WooCommerce
Laravel
NET Framework
CI/CD
Amazon Web Services (AWS)
Timeline
Full-Stack Engineer
Coherent Solutions
01.2023 - Current
Full-Stack Developer
Graffino
10.2020 - 12.2022
Full-Stack Developer
Smultron Web Development
07.2018 - 09.2020
Bachelor of Science - Computer Science
Poznan University of Technology
05.2001 -