We are fully committed to an agentic future.

Join Unlimit's AI engineering team in Serbia and work on the global payment infrastructure powering global, agent-driven commerce.

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Why

Payments are evolving from human-operated systems to intelligent, agent-driven platforms — designed to scale, adapt, and operate autonomously in a global economy.

From day one

You'll help turn fragmented financial ecosystems into a single programmable layer, making global expansion a matter of code, not geography.

The Unlimit AI hub team in the Belgrade office

Why join us?

At Unlimit, we're transitioning from a traditional fintech to an AI-native, agentic financial infrastructure. Meaning, we're at a point where foundational architectural decisions are being made. This is why we're actively hiring the best AI-driven engineers on the market to help us make choices that will shape product behaviour, system intelligence, and long-term autonomy.

If you're fond of designing autonomous systems, agent workflows, and API-first architectures at scale, and want to be part of a team of senior engineers working on how AI-powered financial systems will operate, this is the moment.

What your future tasks will look like

01

Designing and building AI agents that autonomously interact with APIs, financial systems, and external services

02

Architecting and scaling production-grade, AI-native systems used globally

03

Making core architectural decisions around agent autonomy, orchestration, observability, and safety

04

Working closely with Product and Design to translate complex financial and AI concepts into real, usable systems

05

Improving performance, reliability, and developer experience across high-load, distributed infrastructure

Tech stack

PRODUCTION Deterministic thinking
Java Kotlin Go

Our production systems are primarily built with these.

AGENTS Probabilistic thinking
Python

Agentic systems, orchestration, AI-assisted workflows, spec-driven development across the company.

Modern systems require both probabilistic and deterministic thinking.

AI agents accelerate delivery, reasoning, and experimentation. Deterministic platforms ensure compliance, scalability, reliability, and operational control.

We strongly discourage manual coding where automation can do better. Instead, we promote spec-driven development, reusable architectures, and AI-assisted engineering workflows across the company.

We value solid engineering fundamentals and pragmatic technology choices.

Our office in Belgrade

At Unlimit, we believe great work happens when people are in the same room. This is why we're building our IT hub in Belgrade, where technical teams can come together to solve problems, move faster, make better decisions, and stay aligned on what we're building.

Located centrally in Europe, at Skyline AFI Tower, we have designed a space you'll love working from.

Office meals
Proper equipment
Fitpass

Meet your future team

You'll work alongside top-tier professionals who have built and scaled complex systems and now focus on AI-native infrastructure. The team brings together different backgrounds, perspectives, and areas of expertise, all collaborating closely from our AI hub in Belgrade with a shared focus on building the next generation of global financial systems.

Valerii Ovchinnikov
Head of PayCore Valerii Ovchinnikov
Anastasiya Piatrkouskaya
Head of APM Anastasiya Piatrkouskaya
Roman Karchmitovich
Global Head of IT Roman Karchmitovich
Mikhail Bolshakov
Lead Solidity Developer Mikhail Bolshakov
Victor Shilo
Chief Technology Officer Victor Shilo
Ekaterina Mikselburg
HR Business Partner Ekaterina Mikselburg

Why Belgrade

Fast-growing tech hub one of the fastest-growing tech ecosystems in Europe. Billion-dollar startup ecosystem valued at over $1B. Strong and stable economy investment-grade country with rising global trust. Booming IT sector €4B+ in tech exports annually, with consistent year-on-year growth.

We also make sure people have what they need from day one, including market-leading compensation, health insurance, and relocation support if you're moving to Serbia from a different part of the world.

Hear from Unlimiters

Building a global, AI-native financial infrastructure requires people who understand complexity and take ownership of it. Here's how the team describes the experience of working at Unlimit.

A strong team, new products to build, and real ownership of the decisions you make — that’s what any engineer who wants to grow is looking for. Unlimit had all three. Constant growth and pushing my own limits. Things that felt hard or out of reach yesterday feel like everyday work today. The pace is high and the opportunities are genuinely open-ended. You get everything you need to grow as a specialist, build a strong team around you, and actually shape the product.

Lead Solidity Developer Mikhail Bolshakov

Joining Unlimit felt like the right move because it offered the opportunity to work on large-scale global payment solutions while continuing to grow as an engineer alongside a strong team. My experience at Unlimit has been very positive so far, challenging projects, talented colleagues, and plenty of opportunities to learn and make an impact. What feels different is the level of ownership and speed, people don’t just discuss solutions, they build and ship them quickly, with strong collaboration across the team.

Blockchain Application Engineer Vahe Hayrapetyan

Unlimit takes the same class of challenges (orchestration, retrieval, getting the agents to behave reliably at scale) and drops them into a global fintech context, where the volume, stakes, and reliability bar are a different order entirely. That was exactly the step up I wanted: harder versions of problems I already cared about, in a domain I’d had my eye on for a while. Being trusted to make real architectural calls from the start sealed it. A lot of places force a choice between moving fast on product and doing work you can stand behind technically. Here the team takes both seriously.

Senior AI Agents Engineer Ratko Nikolić

Our hiring process

01

Intro conversation

02

Deep-dive technical discussion

03

Hands-on AI agent workflow challenge

04

Team collaboration session

05

Final decision