Jan Kolenko

Senior Full Stack Engineer
& Product-Oriented Technologist

Product-driven software engineer with deep expertise in building performant, accessible, and user-centric digital experiences. Skilled in architecting full-stack systems, designing scalable backend services, and developing polished, maintainable frontend interfaces. I thrive at the intersection of engineering and product — contributing not just code, but ideas that shape impactful, long-lasting solutions. Proficient in database and web technologies. I build pixel-perfect, engaging, and accessible digital experiences.

Back in 2015, I logged my first "Hello World!" to the console — and never looked back. Since then, I've had the privilege of building software for a culinary concept, a start-up, and a huge corporation.

Today, I work on building accessible, high-performance internal tools and user interfaces at Adidas. I thrive where design and engineering intersect — crafting experiences that are intuitive, scalable, and technically sound. I don't just ship code; I contribute ideas, challenge assumptions, and collaborate closely with teams to shape better products.

When I'm not at the computer, I'm probably catching up on software news, playing or watching sports, reading, spending time with friends and family, or heading to the gym.

  1. 2024 - PRESENT

    Senior Full Stack Engineer & Product Architect

    Partnered closely with product managers and designers to architect and reshape the New Home tab within the Confirmed app, defining the core user experience and technical vision. Led the redesign and full rebuild of the CRM platform from the ground up, focusing on seamless user workflows and modern UI/UX principles. Developed key features around Latte — the custom rendering engine powering the app — optimizing how it processes and renders components for enhanced performance and flexibility. Championed product-driven engineering, contributing ideas and actively participating in strategic meetings to drive impactful improvements beyond code.

    • React
    • TypeScript
    • Node.js
    • Custom Render Engine
    • CRM Architecture
  2. 2023 - 2024

    MVP Email Delivery & CRM Developer

    Designed and built a scalable MVP for an email delivery system leveraging AWS Pinpoint as the cloud backend. Created a custom CRM enabling users to build emails via drag-and-drop with predefined, reusable components optimized for email clients. Implemented advanced features such as template management, newsletter subscription/unsubscription workflows, and scheduling capabilities — adding a robust abstraction layer on top of AWS services. Focused on optimizing email code output for deliverability and responsiveness while ensuring an intuitive user experience.

    • AWS Pinpoint
    • Node.js
    • React
    • TypeScript
    • Email Templating
    • Drag-and-Drop UIs
  3. 2022 - 2023

    Senior Full Stack Engineer

    Reimagined and implemented a new CRM interface for an internal localisation platform, focusing on improving usability and efficiency for content and language teams. Contributed to the backend microservice architecture using Node.js and PostgreSQL, working alongside other engineers to shape scalable services. Drive product improvements by collaborating closely with product managers, designers, and cross-functional teams to deliver accessible, user-centric tools on an agile 2-week sprint cadence. Contribute to CRM enhancements for seamless user workflows, ensuring high code quality and system reliability across services.

    • Node.js
    • PostgreSQL
    • Docker
    • TypeORM
    • Redis
    • JavaScript
    • TypeScript
    • React
  4. 2019 - 2022

    Lead Software Engineer

    Build, style, and ship high-quality websites, design systems, and cross-platform digital experiences for a diverse array of clients using technologies such as Node.js, JavaScript, TypeScript, React, HTML, CSS and more. Lead the development and architecture of technical tools like content management systems, REST APIs, and continuous integration pipelines to fulfill business requirement.

    • Node.js
    • JavaScript
    • TypeScript
    • React
    • Storybook
    • MobX
    • Styled Components
  5. 2017 - 2019

    Senior Software Engineer

    Engineered and improved major features of heycar's customer-facing web app using React. Proposed and implemented scalable solutions to issues identified with cloud services.

    • React Native
    • React
    • MobX
    • JavaScript
    • Typescript
  6. 2016 - 2017

    Software Engineer

    Developed, maintained, and shipped production code for client websites primarily using HTML, CSS, Sass, JavaScript, and jQuery

    • HTML
    • CSS
    • JavaScript
    • jQuery
    7. View full résumé

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