Senior Backend Engineer (Java)

Millions of people across Europe want better ways to build long-term wealth, but traditional investing feels complex, inaccessible, or out of reach.

Mintos is solving that. We've built a platform that makes passive income investing simple, transparent, and accessible, and we're expanding fast.

You'll revolutionize our internal payment infrastructure and support millions of investors across Europe in seamlessly managing their funds across all our investment products - all in one place. If this is the kind of problem you want to solve, let's talk.

As a Senior Java Developer, you'll help us build and scale our internal payment hub—seamlessly integrated, reliable, and secure.

You will:

• Deliver backend features end-to-end: from API endpoints to integrations with external payment providers and banking partners.
• Design and implement payment flows that connect our various asset classes (Notes & Loans, ETFs, Crypto ETPs, and upcoming products).
• Write clean, maintainable, well-tested code using modern Java and Spring Boot.
• Ensure high system reliability and performance for payment processing, covering edge cases and failure scenarios.
• Build and maintain APIs that enable other teams to integrate payment functionality into their products.
• Collaborate daily with engineers, product designers, and product owners to create intuitive payment experiences.
• Continuously improve performance, observability, and the overall developer experience.

Our tech stack:

We're working in a microservices architecture, with Java 21+, Spring Boot, RabbitMQ, and PostgreSQL. Our systems are event-driven, with eventual consistency, domain ownership, and observability as core principles.

Java 21, Spring Boot 3.5.x

Groovy 4, Spock 2.4

Lombok, vavr

Cucumber for end-to-end tests

RabbitMQ for inter-service communication

Liquibase, PostgreSQL

Gradle, Docker, Kubernetes

GitHub for source control and deployment pipelines

AWS services (ECS, ECR, RDS, CloudWatch, S3, SQS, SNS)

• Proven experience (5+years)in building scalable backend services using modern Java (11+), Spring Boot, and related tools
• Good grasp of distributed systems, message brokers (like RabbitMQ), and service boundaries
• Solid SQL skills and experience working with relational databases like PostgreSQL
• Familiarity with CI/CD tools, Docker, Git, and containerized deployment practices
• A test-driven mindset and a strong sense of ownership over your code in production
• Good communication skills and written English (we work in international teams)
• Experience working in agile cross-functional teams, with a passion for product discovery and delivering real user value

Nice to have

• Experience working in in core banking and accounting domains, or in other regulated domains
• Experience building RESTful APIs
• Experience building internal platform services that other engineering teams depend on
• Experience with event-driven architecture or patterns like event sourcing

• Flexibility that fits real life. We understand how important it is to stay connected with colleagues while having the opportunities to work remotely. Come to the office to collaborate and be productive side by side, work from home when you need to, and spend up to three months each year working from another country.
• Generous vacation policy. Rest and recovery are essential. We don’t limit vacation to the minimum required by law. Take the time you need to recharge and come back refreshed.
• Learning and growth. An annual €1,200 learning budget to support your professional and personal growth. Whether you want to explore something new or deepen your expertise, we’ll support you along the way.
• Very well equipped office. Comfortable environment matters. When in the office, enjoy the parking, showers, kitchen with snacks and drinks, massage chair, nap room and others.