Nikola
Vrhovac

Experience

• Principal Front-end Developer (promoted from Senior, Nov 2025)

  Marktguru (ProSiebenSat.1) | Dec 2021 - present

  Marktguru digitizes flyers to help users find the best deals, using AI for personalized recommendations. It also offers shopping lists, store info, cashback, and targeted advertising for businesses.

  • Promoted to Principal in Nov 2025 after leading a team of three and shipping the company's first production AI features — LLM-driven recipe generation and personalized offers
  • Built a multi-tenant cashback application with interactive data visualizations that unlocked a key enterprise use case and brought in new subscribers
  • Architected the analytics and consent stack (GTM, GA4, Usercentrics, Mixpanel) across multiple products, keeping a primary app serving millions of users GDPR-compliant
  • Modernized the front-end stack: introduced Next.js and Astro, migrated build and test tooling to Vite and Vitest, and integrated Google and OpenAI generative models into core products
  • Improved front-end performance and accessibility, then set up weekly monitoring to hold the gains

  Tech stack:

  Preact, TypeScript, JavaScript, HTML, CSS, Python, Astro, Next.js, Node.js, Vite, Redux, Git, Docker, Azure, Webpack, Vitest, Jest, CI/CD, Netlify, Strapi CMS, WordPress

• Front-end developer

  BWIN (Entain) | Dec 2019 - Dec 2021

  Entain plc is an FTSE 100 company and one of the world's largest sports betting and gaming groups, operating in both the online and retail sectors.

  • Built a library of reusable Angular UI components that cut feature build-and-deploy time by an estimated 25%
  • Built a shared component system that cut development overhead and kept the UI consistent across hundreds of localized betting sites
  • Developed and optimized high-traffic enterprise apps serving millions of users globally

  Tech stack:

  Angular, TypeScript, LESS, SASS, Bootstrap, Webpack, Gulp, Node.js, GitLab, C#, Sitecore

• Front-end developer

  Gowi DOO | May 2017 - Dec 2019

  Gowi is a Serbian software company with over 20+ years of experience, serving enterprise clients in B2B publishing and media, legal, finance, public sector, and healthcare.

  • Architected the front-end for an LLM-powered app that aggregated global scientific-conference data, giving oncology and drug-therapy researchers personalized summaries to speed their work
  • Built data visualizations in Highcharts and D3.js that let clients spot trends and positive signals in complex drug-trial data
  • Started and ran React/Redux workshops that drove the company's adoption of both, smoothed new-developer onboarding, and cross-trained backend engineers into front-end work

  Tech stack:

  React, Redux, AngularJS, TypeScript, Highcharts, D3.js, PHP, WordPress, SASS, LESS, Bootstrap, Gulp, jQuery, Webpack, C#, .NET, Sitecore

• Web developer

  Civic Initiatives | Sep 2016 - Dec 2019

  Nonprofit organization with a mission to strengthen civil society through education, promotion of democracy, and support of active citizenship.

  • Sole developer across the full stack — front-end, back-end, design, themes, SEO, analytics, and architecture
  • Built and ran 10+ WordPress sites on Apache: setup, migrations, security, optimization, and backups

  Tech stack:

  PHP, WordPress, JavaScript, jQuery, CSS

• Technical project coordinator

  Farmdoor (Cookpad Inc.) | Aug 2014 - Sep 2016

  Farmdoor was a 24/7 farmer's market stand on the streets of Palo Alto. Customers were offered to buy fresh fruits and vegetables from self-serving stands using web or phone app.

  • Coordinated and planned work for the developer team
  • Built transactional and newsletter emails; managed timelines, scheduling, and reporting/data analysis

  Tech stack:

  Ruby on Rails, PostgreSQL, Heroku, HTML, CSS

• Web administrator

  Gigatron/ComTrade | Aug 2013 - Jul 2014

  One of the biggest computer/tech retailers in Serbia.

  • Managed and optimized the sales-page front-end, keeping product data accurate across layouts and designs

• System/Network administrator

  dpa (Deutsche Presse-Agentur) | 2003 - 2012

  The dpa is the largest press agency in Germany, founded in 1949, with headquarters in Hamburg.

  • Single-handedly ran all networks, servers, software, and hardware for dpa's Balkans office in Belgrade