Unlimit10mo ago

Agentic Systems Engineer

Serbia·BelgradeFull-Timemid

Systems EngineerInfrastructure & Cloud

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Overview

About Unlimit Unlimit is a global fintech ecosystem built to eliminate financial borders holding businesses back. The company provides the extensive infrastructure needed to scale globally, integrating payment processing, multi-currency business accounts, BaaS and crypto gateways into a single,…

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About Unlimit

Unlimit is a global fintech ecosystem built to eliminate financial borders holding businesses back. The company provides the extensive infrastructure needed to scale globally, integrating payment processing, multi-currency business accounts, BaaS and crypto gateways into a single, intelligent platform.

Across 17 offices globally, Unlimit bridges hyper-local expertise with a high-capacity financial network, giving companies the agility to expand across regions with operational confidence and speed. Driving the evolution of payments, Unlimit is transforming its infrastructure from human-operated fintech into AI-native financial infrastructure — where APIs are consumed by machines, integrations are negotiated by agents, and systems evolve continuously through intelligent automation. Our next users are not only humans. They are AI agents acting on behalf of humans and businesses.

Unlimit serves more than the needs of businesses today; we are building the nervous system for a borderless global economy.

We are looking for a Senior AI Agent Engineer with deep Java/Kotlin expertise to design and build the agentic backend layer powering Unlimit’s global financial platform.

You will not just write backend services. You will design AI agents that generate, operate, validate, monitor, and evolve backend services.

This role is for engineers who understand that the future of software is Human + AI co-creation, and soon — AI-to-AI collaboration.

At Unlimit, backend engineering is evolving into agent engineering.

You won’t simply write Java or Kotlin services. You will design and implement AI agents that build, refactor, test, and optimize those services — agents that actively participate in the software lifecycle rather than passively assisting it. Instead of creating microservices only for human consumption, you will architect systems that are self-describing, agent-consumable, and machine-operable by design.

Your APIs will not just be called — they will be reasoned about. AI systems will understand their contracts, constraints, and behaviors. You will help construct a full pipeline from requirements to deployment, where validation agents automatically enforce PCI-DSS rules, regulatory constraints, scalability requirements, and architectural standards. Compliance will not be a checklist at the end — it will be continuously verified by intelligent systems embedded in the flow.

And it won’t stop at build-time automation. You will develop autonomous monitoring agents capable of detecting anomalies, diagnosing root causes, and triggering corrective workflows in production environments operating at global financial scale. Traditional microservices will be redesigned into agent-ready execution units — modular, observable, introspectable components that machines can safely evolve.

You will collaborate closely with DevOps, Data, and AI teams who are building their own agents, uniting these systems into a coordinated multi-agent ecosystem that powers our financial infrastructure.

The outcome is simple but transformative: your code will not only serve production. It will serve the agents that run production.

A mindset that sees AI not as a tool, but as a new execution layer. You design systems where agents act, validate, and evolve software — not just assist humans.

Proven experience integrating LLMs, MCP servers, and multi-agent systems into real engineering workflows — not experiments, but production-oriented pipelines.

Hands-on work with frontier models such as Claude Opus 4.x, GPT-5.x Codex or similar — using them for structured reasoning, code generation, validation, orchestration, and system design.

Strong understanding of context engineering and token economics — including prompt architecture, reusable memory patterns, retrieval layers (RAG), persistent state management, and optimizing token consumption for long-horizon agent workflows.

Ability to design guardrails for autonomous systems — validation layers, policy enforcement, compliance checks, circuit breakers, and architectural constraints that keep AI-driven systems stable and safe.

4+ years of strong Java (Spring/Spring Boot) or Kotlin experience in production environments — enabling you to validate, constrain, and refine what AI agents generate.

Deep understanding of distributed systems and scalable backend architectures in high-throughput, low-latency environments.

Experience designing resilient microservices capable of operating under financial-grade reliability and regulatory requirements.

Comfort building observable, introspectable, automation-friendly systems — because agents cannot safely operate opaque services.

Strong communication skills to collaborate effectively in a global AI-first organization where engineering, data, compliance, and product intersect.

Experience in fintech, payments, or banking systems.

Experience working with AWS services and infrastructure.

Familiarity with containerized deployments (Docker, Kubernetes) and CI/CD pipelines.

Exposure to AI-enabled systems or interest in integrating intelligence into applications.

Background in event-driven architectures and message-based systems (Kafka, RabbitMQ).

Software developers will not disappear. But software development as we know it will.

We are transforming Unlimit into an AI-first, agent-native fintech platform.This role sits at the center of that transformation.

If you want to:

Build financial infrastructure for AI agents

Replace manual engineering with autonomous systems

Design platforms where machines are first-class users

Work at the frontier of fintech + AI

Then this is your role.

Join Unlimit Team now!

Unlimit is an equal opportunity employer. We believe passionately that employing a diverse workforce is central to our success. We make recruiting decisions based on your experience and skills. We welcome applications from all members of society irrespective of age, sex, disability, sexual orientation, race, religion or belief.

Location & Eligibility

Where is the job

Belgrade, Serbia

On-site at the office

Who can apply

Listed under

Worldwide

Listing Details

Posted: October 14, 2025
First seen: March 26, 2026
Last seen: September 3, 2026

Posting Health

Days active: 160
Repost count: 0
Trust Level: 29%
Scored at: September 3, 2026

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Unlimit

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Unlimit is a global fintech company offering comprehensive payment solutions to businesses, enabling them to expand and optimize their payment processes.

Employees

350

Founded

2009

Domain

Jobs

External application · ~5 min on Unlimit's site

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