Kotlin/Java Developer (Merchant Response)

Our team is developing a payment gateway for accepting funds from users on behalf of merchants, as well as sending funds from merchants to users. The system involves storing user payment data and is subject to PCI DSS compliance. It contains multiple integrations with payment systems, providers, and other gateways and processors, including 3DS.

Job Responsibilities

• Developing new payment integrations and services;

• Automating and optimizing integration processes;

• Analyzing external provider documentation, conducting rapid checks, and defining epics and tasks based on Proof of Concept;

• Participating in the design and development of high-load system architectures;

• Supporting and improving existing solutions and services;

• Writing high-quality, test-covered code (unit tests, integration tests);

• Conducting code reviews;

• Optimizing system performance and database queries;

• Analyzing and resolving production incidents and bugs;

• Processing and resolving requests from technical support and users as part of daily duties;

• Collaborating with the QA team to ensure the high quality of delivered products;

• Using AI-tools to accelerate delivery of integration modules and creating internal tools to generate integration code from business requirements;

• Maintaining technical documentation and writing technical specifications;

• Assisting in onboarding new developers and ensuring code quality;

• Definition and formation of technical epics — analyzing existing solutions, identifying opportunities to improve system architecture, performance, and reliability, preparing improvement proposals, and aligning them with the team lead and architect;

• Participation in the creation of business epics — analyzing requirements, assessing feasibility, and proposing alternative or optimized solutions based on technical expertise; collaborating with analysts and product managers to determine the best implementation approach;

• Preparing tasks based on approved epics, ensuring proper detailing and alignment with architectural and business requirements;

• Estimating task completion timelines, participating in sprint planning, and providing accurate technical time and effort estimates.

You’ll thrive here if you have

• 3+ years of commercial development experience with Kotlin (Java will be a plus);

• Experience working with the Spring Framework;

• Experience developing and integrating payment solutions (billing, payment gateways, and payment processors);

• Practical experience integrating with external payment providers;

• Experience designing and optimizing relational databases (MySQL);

• Experience with NoSQL databases (Redis);

• Practical experience using AI-assisted coding tools (Copilot, ChatGPT, Codeium, etc.) to improve speed and quality of development;

• Ability to critically review AI-generated code, ensuring production-ready quality and compliance with company standards;

• Knowledge of Event-Driven Architecture principles and experience with distributed messaging systems (e.g., Apache Kafka);

• Excellent command of core software development and design principles, test-driven development (TDD), and CI/CD processes;

• Solid understanding of microservice architecture;

• English proficiency level B1 or higher.

Preferred Qualifications:

• Experience with Camunda (creating and supporting processes);

• Solid understanding of PCI DSS standards, ISO 27001, and other information security methodologies;

• Practical experience working with AWS;

• Experience with Jira and GitLab CI/CD;

• Experience in designing or developing internal tools that automate or accelerate integration development (e.g., generators based on business requirements).

Conditions

We know that great talent deserves great conditions, so here's what you can expect when joining us:

• Full remote work.

• Competitive compensation with a service contract.

• Transparent performance reviews twice a year, with bonus opportunities and salary adjustments.

• An annual allowance that you can use for home office improvements, sports activities, equipment upgrades, and more—tailor it to what benefits you most.

• Investment in your development: paid language courses, access to various learning platforms, and a mindfulness benefit, including psychological support with 50% coverage.

• Career growth in a fast-scaling project with opportunities to influence technical decisions.

• A culture of recognition: our peer reward program celebrates contributions from across the team.

Benefits are provided in accordance with the company’s policies and eligibility criteria.

Recruitment process

1. HR interview (40 min);

2. Interview with hiring managers (1,5 hour);

3. Test task;

4. Final interview (1 hour) optional;

5. Recommendations check;

6. Offer.

Our team is developing a payment gateway for accepting funds from users on behalf of merchants, as well as sending funds from merchants to users. The system involves storing user payment data and is subject to PCI DSS compliance. It contains multiple integrations with payment systems, providers, and other gateways and processors, including 3DS.

Job Responsibilities

• Developing new payment features and services;

• Designing and implementing APIs (external and internal);

• Creating and maintaining processes in Camunda;

• Participating in the design and development of high-load system architectures;

• Supporting and enhancing existing solutions and services;

• Writing high-quality, test-covered code (unit tests, integration tests);

• Conducting code reviews, including frontend code;

• Optimizing system performance and database queries;

• Analyzing and resolving production incidents and bugs;

• Processing and resolving requests from technical support and users as part of daily duties;

• Analyzing documentation from external providers, conducting quick checks, and defining epics and tasks based on Proof of Concept;

• Collaborating with the QA team to ensure the high quality of the delivered product;

• Maintaining technical documentation and writing technical specifications;

• Assisting in onboarding new developers and ensuring code quality;

• Definition and formation of technical epics — analyzing existing solutions, identifying opportunities to improve system architecture, performance, and reliability, preparing improvement proposals, and aligning them with the team lead and architect;

• Participation in the creation of business epics — analyzing requirements, assessing feasibility, and proposing alternative or optimized solutions based on technical expertise; collaborating with analysts and product managers to determine the best implementation approach;

• Preparing tasks based on approved epics, ensuring proper detailing and alignment with architectural and business requirements;

• Estimating task completion timelines, participating in sprint planning, and providing accurate technical time and effort estimates.

Important and Challenging Tasks:

• Creating and developing reliable payment solutions with high security and performance levels;

• Optimizing the performance and scalability of payment systems;

• Integrating complex external providers;

• Participating in ensuring system compliance with high-security requirements (PCI DSS and others).

Technology Stack and Tools:

• Kotlin / Java;

• MySQL;

• Redis;

• Apache Kafka;

• Camunda 8;

• Redshift;

• Keycloak;

• AWS;

• Spring Framework;

• GitLab CI/CD;

• Jira;

• Sentry;

• Kibana;

• Grafana;

• AI-assisted coding tools (Copilot, ChatGPT, Codeium, etc.).

You’ll thrive here if you have

• 3+ years of commercial development experience with Kotlin;

• Experience with the Spring Framework;

• Experience in developing payment solutions (billing, payment gateways, payment processors, exchanges);

• Practical experience integrating with external providers;

• Experience designing and optimizing relational databases (MySQL);

• Experience with NoSQL databases (Redis);

• Practical experience using AI-assisted coding tools (Copilot, ChatGPT, Codeium, etc.) to improve speed and quality of development;

• Ability to critically review AI-generated code, ensuring production-ready quality and compliance with company standards;

• Knowledge of Event-Driven Architecture principles and experience working with distributed messaging systems (e.g., Apache Kafka);

• Excellent command of core software development and design principles, test-driven development (TDD), and CI/CD processes;

• Experience implementing simple and moderately complex interfaces using ReactJS and/or Svelte;

• Strong understanding of microservice architecture;

• English proficiency level B1 or higher.

Preferred Qualifications:

• Experience with Camunda (creating and supporting processes);

• Solid understanding of PCI DSS standards, ISO 27001, and other information security methodologies;

• Practical experience working with AWS;

• Experience with Jira and GitLab CI/CD.

Conditions

We know that great talent deserves great conditions, so here's what you can expect when joining us:

• EU-based employment contract and a 3-year Cyprus work visa with full support for your relocation and visa processes, including assistance for your family.

• EU passport. Opportunity to obtain an EU passport after 4 years of residence

• Full relocation package: flights to Limassol for you and your family, a company-covered apartment for the first month, and full relocation support to make your move smooth and hassle-free.

• Provident fund (Cypus): a long-term savings plan co-funded by you and the Company together (available after probation) that grows throughout your time with us in Cyprus.

• Transparent performance reviews twice a year, with bonus opportunities and salary adjustments.

• Private medical insurance for you and your family

• Corporate mobile plan (unlimited in Cyprus with roaming included)

• Mindfulness & well-being support, including psychological assistance with 50% coverage.

• 50% coverage of school and kindergarten fees for your children.

• Fully covered sports benefits, and also access to in-house electric scooters and bike rentals

• Professional growth support: language courses, conferences, training programs, and coaching.

• Peer recognition program: receive and share kudos for great work.

• A fully equipped office in Limassol’s city center, with everything you need for deep work and collaboration.

• Free breakfasts and lunches in the office and an in-house coffee bar with high-quality drinks and a health bar stocked with nutritious snacks.

• A strong engineering culture: international teams, corporate events, team buildings, and hackathons — because great work happens in great communities.

Benefits are provided in accordance with the company’s policies and eligibility criteria.

Recruitment process

1. HR interview (40 min);

2. Interview with hiring managers (1,5 hour);

3. Test task;

4. Final interview (1 hour) optional;

5. Recommendations check;

6. Offer.

About Revolut

People deserve more from their money. More visibility, more control, and more freedom. Since 2015, Revolut has been on a mission to deliver just that. Our powerhouse of products — including spending, saving, investing, exchanging, travelling, and more — help our 80+ million customers get more from their money every day.

As we continue our lightning-fast growth,‌ 2 things are essential to our success: our people and our culture. In recognition of our outstanding employee experience, we've been certified as a Great Place to Work™. So far, we have 13,000+ people working around the world, from our offices and remotely, to help us achieve our mission. And we're looking for more brilliant people. People who love building great products, redefining success, and turning the complexity of a chaotic world into the simplicity of a beautiful solution.

About the role

This role offers the opportunity to relocate to Poland, Spain, or the UAE. You'll receive support from Revolut throughout the entire process. Once you move, you'll have the flexibility to work remotely or in a hybrid model in our offices in Krakow, Barcelona, Madrid, or Dubai.

Our Technology team builds the systems and experiences that keep Revolut moving. From the infrastructure behind our innovative app to the features used by millions of people around the world, they bring sharp thinking, speed, and a focus on meaningful impact to everything they do.

We’re looking for a Backend Engineer who's interested in every step, stage, and release of a feature to collaborate effectively with team members across the business.

You'll keep frameworks lean and focus on what matters: clean, maintainable code, shipped fast with TDD, DDD, and continuous integration and delivery.

Our stack includes Java 17/21, GCP, Kubernetes, Grafana, Prometheus, NewRelic, PostgreSQL, Redis, Spock, jOOQ, and Flyway.

Up to shape what's next in finance? Let's get in touch.

What you'll be doing

• Building mobile APIs
• Developing microservices to evolve our architecture
• Perfecting systems that our business depends on, like risk management, fraud detection, and payment processing
• Focusing on greenfield development and improvement of existing systems

What you'll need

• Fluency with Java
• 6+ years of experience in backend development
• A bachelor's degree in computer science, maths, physics, or similar field
• To be a quick learner with an ambitious attitude and results-driven personality
• The ability to work well as part of a team in a fast-paced environment
• Excellent communication and organisational skills
• Fluency in English

Nice to have

• Experience with Kotlin or Scala
• Experience in finance
• Experience in a startup or scale-up
• Experience in a product-focused environment

Compensation range

• Poland: PLN25,500 - PLN40,000 gross monthly*
• Other locations: Compensation will be discussed during the interview process

*Final compensation will be determined based on the candidate's qualifications, skills, and previous experience