konradhopek

Project Leadership: Led the end-to-end design and implementation of a greenfield fiat payments infrastructure supporting global web and mobile platforms (React & React Native). Strategic Planning: Authored comprehensive PRD (Product Requirement Documents) for high stakes initiatives, including the Token Sale and IPO readiness infrastructure, aligning technical roadmaps with corporate milestones. System Architecture: Designed and refined seamless, fault-tolerant transaction pipelines that optimized fund transfers for speed and security, reducing friction in the user onboarding experience. Execution & Mentorship: Acted as a player/coach, contributing high quality code to the React/TypeScript codebase while mentoring a team of engineers on security best practices and high performance API design.

Full-Stack System Design: Directed the architectural design of frontend and backend systems within a large-scale SaaS ecosystem, focusing on modularity and high-traffic scalability. Modernization: Spearheaded a progressive migration of legacy AngularJS codebases to a modern React/TypeScript architecture, utilizing incremental release strategies to maintain 99.9% uptime. Performance Engineering: Optimized React Native mobile apps (Expo) and integrated GraphQL/REST APIs to improve UI responsiveness and data handling for millions of concurrent users. Infrastructure & Tooling: Established robust CI/CD pipelines and automated testing suites using Jest and Cypress; managed relational data persistence using PostgreSQL. Cross-Functional Leadership: Collaborated with product and design to influence technical strategy, ensuring system designs met complex enterprise customer requirements.
Stack: React, React Native, Expo, TypeScript, AngularJS, GraphQL, Node.js, Java, Jest, Cypress, PostgreSQL

Delivered features in Angular (v2+) with NgRx for a supply‑chain optimization platform. Co‑created a React‑based survey system and a React Native mobile app for field technicians. Designed backend services in Java (Spring Boot) and deployed to AWS.
Stack: Angular, React, React Native, Ionic, NgRx, RxJS, Spring Boot, GraphQL, AWS

Developed hybrid mobile apps with Cordova and native Android modules for public‑safety use cases. Implemented AngularJS UIs; automated tests with Appium and Python‑based services; CI/CD with Jenkins.
Stack: AngularJS, Cordova, Java, Android, Appium, Python, Jenkins