Zoran Ćulum

Experience

1. Senior Frontend Engineer, Symphony

   May 2025 – Present Fintech

   • React
   • Next.js
   • TypeScript
   • Python
   • .NET
   • Azure
   • Design and build enterprise fintech systems, from frontend architecture through to service integration.
   • Lead a group of frontend engineers on delivery, code quality and technical direction.
   • Write proposals and technical documentation that support client engagements.
   • Joined as a frontend engineer and moved into the senior role.

2. Software Engineer and Tech Lead, Toptal

   Aug 2022 – May 2025 Healthcare

   • React
   • React Native
   • Node.js
   • .NET
   • Azure
   • Delivered frontend solutions for enterprise healthcare clients on contract.
   • Worked across front end and back end on consultancy projects with shifting requirements.
   • Deployed and released client platforms that gave teams clearer insight into their own data.

3. Software Engineer, My QR Code

   Mar 2023 – Dec 2024

   • React
   • TypeScript
   • Next.js
   • Built product features and owned the payment integrations end to end.

4. Software Engineer, Unizen

   May 2022 – Sep 2024 Blockchain

   • React
   • React Native
   • Next.js
   • Node.js
   • Web3
   • Designed the interface for trading across several decentralised exchanges, plus an NFT marketplace, and kept swaps smooth under tight deadlines.
   • Integrated MetaMask and Coinbase wallets with blockchain data APIs including Bitquery, OpenSea, LooksRare, Blockspan and Moralis.
   • Built a dashboard for tracking initial coin offerings and token airdrops.
   • Built a mobile app that verifies ownership of luxury cars and bags using RFID chips and on-chain records.

5. Software Engineer and Tech Lead, HTEC Group

   Dec 2020 – May 2022 eCommerce

   • React
   • Next.js
   • Node.js
   • GraphQL
   • PostgreSQL
   • AWS
   • Started the project as the only developer and released a stable product with a frontend team of twelve.
   • Set the architecture and held the performance of the main eCommerce site, including a full checkout used by thousands of people a day.
   • Built the seller back office and a custom ticketing service inside it, with separate applications per staff role, used by museums and other art institutions.
   • Led the frontend team and took part in technical and managerial decisions.

6. Software Engineer, Oroundo Mobile GmbH

   Dec 2018 – Dec 2020

   • Node.js
   • React Native
   • Next.js
   • MongoDB
   • PostgreSQL
   • AWS
   • Jenkins
   • Built a custom API gateway for the company's microservice architecture.
   • Built real-time time tracking, payroll and subscriptions for a waste collection company, with more than 200 field staff checking in daily and thousands of customers.

7. Web Developer, Flashboys

   Jan 2018 – Dec 2018

   • React Native
   • Vue.js
   • PHP
   • Built a crypto wallet app for Android and iOS and shipped it to production.

8. Web Developer and Consultant, QSD BiH

   Feb 2018 – Apr 2018

   • Laravel
   • Vue.js
   • Developed a ride-hailing platform in Laravel and Vue.js.

9. Backend Developer, OGO Sense

   Sep 2016 – Jan 2018

   • PHP
   • Laravel
   • WordPress
   • Lead backend developer on projects for small and medium businesses across several industries.
   • Started as a web development intern and stayed on full time.

Selected work

Education