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Veselin Reljic

@veselinreljic

Lead React and React Native Engineer at Covantis; co-founded 1Grabber and led its location-based rewards platform from concept to production.

Serbia

Message

At Covantis, I was Lead Front-End Engineer for a large-scale agricultural trade execution platform, aligning developers across teams and leading implementation of complex product features. I contributed to front-end architecture and technical direction, with a focus on accessibility, performance, and maintainability.

On 1Grabber, which I co-founded, I led technical development of a location-based rewards platform from concept to production. I designed geolocation experiences and voucher redemption workflows, and owned the platform architecture, backend APIs, analytics infrastructure, and mobile release workflows.

Experience

Work history, roles, and key accomplishments

Current

Co-Founder & Lead Developer

Current

Grabber

Nov 2020 - Present (5 years 11 months)

Led end-to-end technical development of a location-based rewards platform from concept to production. Designed and implemented scalable geolocation-based user experiences, digital voucher redemption, and campaign management workflows.

React Native React TypeScript Expo MobX React Query Mapbox AWS Fastify Prisma PostgreSQL Firebase Analytics CI CD

Lead React / React Native Engineer

Covantis

Jul 2021 - Aug 2026 (5 years 1 month)

Lead Front-End Engineer aligning developers across teams to deliver scalable front-end solutions for a large-scale agricultural trade execution platform. Contributed to architecture, technical direction, and engineering standards, leveraging AI-assisted development tools.

React React Native TypeScript JavaScript (ES6+)Expo Mapbox NodeJS Fastify REST APIs Redux MobX React Query Storybook Jest React Testing Library Claude Code GitHub Co Pilot HTML5 CSS Web3 Gitlab CI CD

Front-End Engineer

ConsenSys

Jan 2021 - Jul 2021 (6 months)

Developed enterprise front-end solutions for banking clients using the ConsenSys Codefi platform. Integrated React-based applications with backend APIs and blockchain infrastructure, delivering scalable Web3 interfaces.

React Jest React Testing Library HTML5 CSS Web3 Ethereum CI CD

Core UI Team Lead

Komgo

Mar 2019 - Dec 2020 (1 year 9 months)

Led the Core UI team developing and maintaining a scalable, responsive, and accessible UI library for a global trade finance platform. Drove consistency, reusability, and maintainability of front-end systems and engineering standards.

React Jest React Testing Library HTML5 CSS Web3 CI CD

Front-End Developer

Datalex

Jan 2018 - Dec 2018 (11 months)

Developed scalable and accessible React-based applications for airline retail solutions, focusing on maintainability, performance, and production readiness.

React Jest React Testing Library HTML5 CSS CI CD

Front-End Developer

Ryanair

Jan 2016 - Dec 2017 (1 year 11 months)

Worked on a large-scale customer-facing flight management platform, extending an AngularJS application to streamline flight change workflows and reduce customer support load.

AngularJS Redux CI CD

Mobile & Web Developer

Various Companies

Jan 2005 - Dec 2015 (10 years 11 months)

Worked on mobile, gaming, and web applications using iOS, Android, Unity, AngularJS, PHP, and Flash technologies across fintech, entertainment, medical, and gaming industries.

iOS Android Unity AngularJS PHP Flash