Description
Senior Java/Kotlin Developer
Team: Backend
Location: Belgrade
Commitment: Full-Time
Workplace Type: onsite
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’re looking for a Senior Java/Kotlin Developer to design and implement modern, scalable backend services that power Unlimit’s global financial platform.
You’ll play a key role in building and evolving our payments and banking infrastructure — designing resilient microservices, integrating with global partners, and contributing to an architecture that’s fast, reliable, and ready for the future of AI-driven financial technology.
What You’ll Be Doing
- At Unlimit, we are building the technology backbone for next-generation financial solutions—spanning payments, Banking-as-a-Service, crypto, and AI-driven services. As a Java/ Kotlin Developer, you will design and develop resilient microservices and APIs that enable these innovations to operate securely and at scale. You’ll build new integrations with external partners and payment systems, working across a distributed environment to ensure performance, reliability, and seamless operation. You will collaborate with other developers, DevOps, and data teams to optimize system design, automate delivery, and support continuous improvement across our engineering organization. Your work won’t stop at writing code—you’ll participate in design discussions, code reviews, and performance tuning sessions, constantly striving to make our systems more efficient and scalable. You’ll be encouraged to explore new frameworks and tools, helping keep our platform ahead of the curve and ready for AI-enabled automation, analytics, and decision-making. This role is ideal for someone who enjoys solving complex problems, takes ownership, and thrives in a fast-paced, collaborative environment where innovation and craftsmanship go hand in hand.
Qualifications You Will Bring
- 4+ years of hands-on experience with Java (Spring, Spring Boot) or Kotlin in production environments.
- Proven experience designing, developing, and debugging RESTful web services and microservices in distributed systems.
- Confident knowledge of Git, Gradle, and common development and delivery tooling used in modern backend engineering (CI/CD, artifact repositories, monitoring tools).
- Solid understanding of software architecture, performance optimization, and scalability in cloud environments.
- Ability to troubleshoot complex issues and deliver elegant, maintainable solutions under time pressure.
- Initiative, curiosity, and ownership—comfortable exploring new technologies and driving innovation from within.
- Strong English communication skills, with the ability to collaborate effectively in cross-functional and international teams.
- Strong AI-driven mindset and curiosity about emerging AI technologies.
- Hands-on experience using AI tools (e.g., LLMs, automation frameworks, AI-assisted development tools) to enhance productivity or system performance.
Nice to have:
- 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).
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.
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