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Hi, I'm Denis Kuivalainen, a full-stack developer with 4+ years of experience building scalable web applications across front-end and back-end systems. I specialize in modern frameworks, API development, and system integrations, and I enjoy turning complex requirements into reliable, high-performance solutions. I'm passionate about collaborating with cross-functional teams, learning new technologies, and delivering clean, maintainable code that helps clients succeed. In my spare time I enjoy exploring new design patterns, contributing to open source, and continuously refining my craft.…Hi, I'm Denis Kuivalainen, a full-stack developer with 4+ years of experience building scalable web applications across front-end and back-end systems. I specialize in modern frameworks, API development, and system integrations, and I enjoy turning complex requirements into reliable, high-performance solutions. I'm passionate about collaborating with cross-functional teams, learning new technologies, and delivering clean, maintainable code that helps clients succeed. In my spare time I enjoy exploring new design patterns, contributing to open source, and continuously refining my craft.

Denis Kuivalainen

Full Stack Developer, Web Developer, Back-End Developer, +2

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Hi, I'm Denis Kuivalainen, a full-stack developer with 4+ years of experience building scalable web applications across front-end and back-end systems. I specialize in modern frameworks, API development, and system integrations, and I enjoy turning complex requirements into reliable, high-performance solutions. I'm passionate about collaborating with cross-functional teams, learning new technologies, and delivering clean, maintainable code that helps clients succeed. In my spare time I enjoy exploring new design patterns, contributing to open source, and continuously refining my craft.…Hi, I'm Denis Kuivalainen, a full-stack developer with 4+ years of experience building scalable web applications across front-end and back-end systems. I specialize in modern frameworks, API development, and system integrations, and I enjoy turning complex requirements into reliable, high-performance solutions. I'm passionate about collaborating with cross-functional teams, learning new technologies, and delivering clean, maintainable code that helps clients succeed. In my spare time I enjoy exploring new design patterns, contributing to open source, and continuously refining my craft.

Available to hire

Hi, I’m Denis Kuivalainen, a full-stack developer with 4+ years of experience building scalable web applications across front-end and back-end systems. I specialize in modern frameworks, API development, and system integrations, and I enjoy turning complex requirements into reliable, high-performance solutions.

I’m passionate about collaborating with cross-functional teams, learning new technologies, and delivering clean, maintainable code that helps clients succeed. In my spare time I enjoy exploring new design patterns, contributing to open source, and continuously refining my craft.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

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Expert

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Expert

Expert

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Expert

Intermediate

Language

English

Fluent

Work Experience

Full Stack Developer

April 1, 2021 - November 1, 2024

Designed and maintained an AWS-based microservices infrastructure handling over 10K monthly transactions and generating €1.5M+ in revenue. Built a serverless backend using Lambda, DynamoDB, RDS/PostgreSQL and other AWS services; implemented a CI/CD pipeline with GitHub Actions. Led frontend and mobile interfaces with Next.js/React and React Native, hosted on AWS and Google Cloud Platform, enabling scalable payment, subscription, and content-management workflows. Implemented media upload to cloud storage and contributed to the web console for user management and payments, delivering end-to-end solutions with a focus on reliability and performance.

Fullstack Developer at Reactron Technologies Oy

April 2, 2021 - November 2, 2024

Designed, developed, and maintained software solutions for various clients. Worked on both front-end (web and mobile) and back-end development, ensuring seamless functionality, performance, and security. Collaborated with partner teams to understand client needs and deliver scalable solutions in a consulting environment.