Senior Java/Kotlin Developer at Unlimit

Belgrade, Serbia

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Not SpecifiedCompensation

Senior (5 to 8 years)Experience Level

Full TimeJob Type

UnknownVisa

Fintech, Payments, Financial ServicesIndustries

Requirements

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

Responsibilities

Design and develop resilient microservices and APIs for payments, Banking-as-a-Service, crypto, and AI-driven services
Build new integrations with external partners and payment systems in a distributed environment
Ensure performance, reliability, and seamless operation of backend services
Collaborate with developers, DevOps, and data teams to optimize system design, automate delivery, and support continuous improvement
Participate in design discussions, code reviews, and performance tuning sessions
Explore new frameworks and tools to keep the platform ahead of the curve for AI-enabled automation, analytics, and decision-making

Skills

Key technologies and capabilities for this role

JavaKotlinMicroservicesAPIsBackend DevelopmentPayment ProcessingScalable SystemsIntegration

Questions & Answers

Common questions about this position

What experience level is required for this Senior Java/Kotlin Developer role?

The role requires 4+ years of hands-on experience with Java (Spring, Spring Boot) or Kotlin in production environments.

What key technical skills are needed for this position?

Candidates need proven experience designing, developing, and debugging RESTful web services and microservices in distributed systems, confident knowledge of Git, Gradle, and CI/CD tooling, plus a solid understanding of software architecture, performance optimization, and scalability in cloud environments.

What is the salary or compensation for this role?

This information is not specified in the job description.

Is this a remote position, or is there a location requirement?

This information is not specified in the job description.

What kind of work environment or company culture can I expect at Unlimit?

You'll work in a fast-paced, collaborative environment with 700+ experts across 17 global offices, collaborating with developers, DevOps, and data teams on resilient microservices for payments and AI-driven financial technology, where innovation, ownership, and craftsmanship are valued.

Unlimit

Provides borderless payment solutions globally

About Unlimit

Unlimit provides borderless payment solutions for businesses aiming to grow locally and globally. The company has developed a large in-house payment infrastructure that allows it to offer a wide range of financial services, including payment acceptance, payment processing, and corporate fund management. Businesses can easily acquire cards, utilize alternative payment methods, and handle international transfers through Unlimit's platform. What sets Unlimit apart from its competitors is its extensive coverage and variety of payment options, including unique local methods tailored to different regions. This enables businesses to confidently enter new markets. Unlimit's goal is to support innovative companies in moving beyond traditional banking technologies, facilitating their expansion and financial management in the evolving fintech landscape.

London, United KingdomHeadquarters

2009Year Founded

VENTURE_UNKNOWNCompany Stage

FintechIndustries

201-500Employees

Benefits

Hybrid Work Options

Paid Vacation

Risks

Increased competition from fintech startups targeting niche markets like the female economy.

Regulatory scrutiny in emerging markets due to DeFi, GameFi, and NFT collaborations.

Challenges in African market expansion due to local regulatory environments.

Differentiation

Unlimit offers the largest in-house developed payment infrastructure globally.

The company provides unique local payment options tailored to specific regions.

Unlimit's borderless payment solutions facilitate seamless international business expansion.

Upsides

Embedded finance growth aligns with Unlimit's BaaS offerings.

Rising digital wallets and contactless payments boost Unlimit's card issuing services.

Cross-border e-commerce growth supports Unlimit's borderless payment solutions.

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