Projects

Our own products, work with other teams, and experience building systems that run in production.

PLAYGRND Our own product

For the people who play, run and follow football.

PLAYGRND is a platform for local football. It brings together league and tournament management, organising games, player profiles and stats, and a community that follows teams, discusses matches and shares the game.

A featured-player query went from about 77 ms to 35 ms.

An individual query measurement from the case study.

View case study Open PLAYGRND

PLAYGRND: football competitions, match results, and community activity.

Memoato Personal memory

Memoato landing page showing a saved personal note and the details remembered from it

Personal memory you can verify.

Memoato keeps your original notes and shows the source behind a retrieved fact. It separates reviewed facts from assumptions, records corrections and allows separate access to logging and search.

Case study Open Memoato

NK Prugovo Pro bono for the community

NK Prugovo website homepage with the club crest and football imagery

A new website for a club built around its community.

We designed and built NK Prugovo's website pro bono, giving the club one clear place for its story, youth academy, media coverage, partners, and contact information.

Case study Open NK Prugovo

HILLS Lab engagements

Engineering work for other teams.

Backends, integrations and infrastructure for clinical research, games and live commerce. These engagements were delivered by the studio’s founder, Hrvoje Pavlinović.

Clarinessvia Povio

2021–2023

Connects patients with clinical trials and helps research teams manage recruitment and enrollment.

Backends for clinical research.

Built APIs, background jobs and database workflows for patient and trial management.
Integrated Twilio for call agents, resolved timezone scheduling issues and automated AWS deployments.

Recommendation · Povio

Open, professional, transparent in communication, and reliable on every agreed scope.

Goran MladenovicHead of Freelance at Povio

ReneVerse

2023–2025

A platform connecting games and advertisers through ads integrated into the game world.

From in-game events to advertising data.

Architected backend services for ad engagement data, targeting and real-time reporting.
Built GraphQL APIs, AWS infrastructure and backend integrations for Unity and Unreal Engine SDKs.

Recommendation

A top-tier engineer who made next-level impact across core Web2/Web3 services and real-time ad targeting infrastructure.

Vladan PetrovicCTO at ReneVerse during the engagement

Tilt

2025–

A live commerce platform with streams, auctions and real-time bidding.

Auctions, payments and shipping in one system.

Built backend workflows for auctions, inventory, seller tools and purchases during live streams.
Integrated Stripe and shipping services, and improved reliability across a distributed TypeScript platform on AWS.

Recommendation

Multiple people have called out the quality and speed of Hrvoje's work across several projects.

AbhiCEO at Tilt

The founder’s earlier work

Wider engineering experience.

Before HILLS Lab, Hrvoje worked at Ericsson Nikola Tesla, Profico and Rimac Automobili. That experience continues to shape how we approach new projects.

Ericsson Nikola Tesla

2015–2018

Develops communications products, telecom systems and ICT solutions.

Tools for analysis, testing and everyday engineering.

Developed internal tools: Nodebook, Atlas and AAT for data analysis and testing.
Moved selected Groovy/Grails tooling to Node.js and created a framework-independent language for test schemas.

Recommendation

Curious, proactive, and willing to take responsibility beyond his role early in his career.

Ivica VidovicHead of UDM Operations during the engagement

Profico

2018–2020

A digital product company working across strategy, design, web and mobile development.

Web products, integrations and growing the team.

Built web applications and backend APIs for media and real estate, including integrations across agency APIs.
Mentored developers, helped align engineering standards and improved performance in existing systems.

Recommendation

Someone we could truly rely on, not afraid to take responsibility and push new initiatives forward.

Ante MatijacaCo-founder of Profico

Rimac Automobili

2020–2021

Designs and builds electric hypercars and advanced automotive technology.

Vehicle telemetry and over-the-air updates.

Built backend services to ingest and process real-time vehicle telemetry.
Developed GraphQL services, Kafka event flows and OTA update workflows with rollback considerations.

Recommendation

An exceptionally capable engineer whose code was built to last in a highly challenging hypercar telemetry and OTA domain.

Denis GrahovacEngineering Manager at Rimac during the engagement