Andrei@Constantinescu.io
andrei@constantinescu.io

Summary

JavaScript Consultant with 10+ years of experience creating scalable web apps and intuitive interfaces using React, Next.js, and Node.js. I've developed microfrontend bridges for mobile apps, engineered a personal privacy-focused service network, and currently building a fitness app powered by React Native. When I'm not fine-tuning my custom LLM or at the gym, I'm delivering impactful solutions. Open to both short-term and long-term roles where I can make an immediate impact.

Skills

Experience

contractUnlikelyAI(AI)
UI Developer
Apr 2024 - May 2024
  • Revamped a chat-based application using React and Tailwind, delivering a fast and intuitive user experience.
  • Built an interactive graph-based interface with React and canvas, enhancing data visualization and communication.
contractBalyasny Asset Management LLP(Financial)
UI Developer
Oct 2022 - Dec 2023
  • Built internal trading analysis tools using ReactJS, NextJS, GraphQL, and Ag-grid, improving interaction speeds by 25% and reducing bundle size by 20%.
  • Contributed to a centralized monorepo, simplifying maintenance and ensuring consistent code and UI quality.
contractCMC Markets plc(Trading)
software consultant
Jul 2021 - Sep 2022
  • Built a real-time collaborative whiteboard tool with ReactJS, WebSockets, and Canvas API, fostering seamless team collaboration.
  • Enhanced performance by 40% through optimized rendering pipelines, ensuring a lag-free user experience.
  • Orchestrated SwiftUI integrations, delivering native responsiveness while maintaining web robustness.
contractBP plc(Energy)
software consultant
Mar 2020 - Mar 2021
  • Developed a framework-agnostic Payments SDK in TypeScript with 90% test coverage and built a ReactJS sandbox app to ensure reliability across payment scenarios.
  • Enhanced security by implementing an AWS-based user login monitor with automated alerts and notifications.
contractPartners Capital LLP(Financial)
frontend developer
Sep 2019 - Mar 2020
  • Developed a ReactJS and TypeScript application, replacing Excel-based processes and improving responsiveness by 35% through optimized state management.
  • Implemented an end-to-end testing regime with Cypress, ensuring feature reliability and system integrity.
contractKaluza(Energy)
senior frontend developer
Jun 2019 - Sep 2019
  • Built a real-time analytics dashboard with NodeJS, Kafka, and custom UK map visualizations using GeoJSON, WebGL, and D3.js.
  • Curated a Storybook component library and mentored junior team members, improving UI consistency and team collaboration.

Previous

  • contractNowTV (Sky UK)senior developerNov 2018 - May 2019
  • contractuSwitchsenior frontend developerAug 2018 - Oct 2018
  • contractThe Sun (News UK)full stack developerMar 2018 - Aug 2018
  • contractAIGfrontend developerNov 2017 - Feb 2018
  • contractThird Space Learningfull stack developerAug 2017 - Oct 2017
  • permanentBeamlysoftware engineerNov 2016 - Aug 2017
  • permanentKano Computingsoftware engineerJul 2015 - Oct 2016
  • permanentLearn Forwardsoftware engineerApr 2014 - May 2015

Key Highlights

BSc in Computer Science from University of Bucharest
View detailed resumeDownload resume