Lead Java/Kotlin Software Engineer (m/f/d)

Ratepay; Berlin; Hybrid; EUR 80.000 - 100.000; Vollzeit

Zusammenfassung

A leading fintech company in Berlin is seeking a Lead Java/Kotlin Software Engineer to develop secure payment solutions. Responsibilities include leading software projects, enhancing system interoperability, and promoting best practices. Ideal candidates have over 10 years in JVM development and expertise in Java, Spring, and Kotlin. Flexible hours and remote work options are available.

Leistungen

Flexible working hours

Remote work (EU for up to 4 weeks a year)

28 vacation days per annum

Pension plan

Monthly lunches

Learning and development platforms

Gym membership or public transport allowance

Dog-friendly office

Qualifikationen

• 10+ years of professional working experience in JVM-based backend development.
• Hands-on expertise in Software Engineering using Java, Spring/SpringBoot, Kotlin.
• Experience in leading and driving initiatives and projects.

Aufgaben

• Lead the development, operation, and improvement of software systems.
• Drive projects and initiatives within the team.
• Integrate APIs in a microservices architecture.

Kenntnisse

JVM-based backend development

Java

Spring/SpringBoot

Kotlin

Git

Maven

Docker

Jenkins

AWS

RESTful APIs

microservices

event-driven architecture

OAuth

Jobbeschreibung

Lead Java/Kotlin Software Engineer (m/f/d)

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Your Mission
Born in the heart of Berlin’s fintech hub, Ratepay has passionately crafted tomorrow’s payment solutions for over a decade. Today, we’re proud to be Europe’s leading white-label Buy Now, Pay Later provider. Our success comes from teamwork, openness, and continuous improvement. We value shared goals over egos, fostering a culture of courage, commitment, and warmth. Our dedicated team of 200+ professionals powers the entire payment value chain - from integration to AI-driven risk management and dunning – delivering tailored payment solutions for businesses across Germany, Austria, Switzerland, and beyond.

As a Lead Software Engineer (m/f/d) at Ratepay, you will make a significant contribution to our shared mission of building and developing secure and simple payment solutions for the online retail market, which still continues to grow.

Responsibilities

• Lead the development, operation, and continuous improvement of scalable software systems.
• Take on a prominent role in your team and be the initiator and driver of projects, initiatives and improvements.
• Integrate internal and external APIs in a microservices architecture, ensuring system interoperability.
• Actively participate in the agile development process, collaborating with cross-functional teams to deliver features.
• Support and groom the entire engineering team, fostering growth, knowledge sharing, and collaboration through methods like pair programming and code reviews.
• Ensure adherence to best practices in software development to maintain high code quality.
• Collaborate with the team and the Principal Engineer to make key technical decisions.
• Ensure alignment between business objectives and technical implementation.

Qualifications

• At least 10 years of professional working experience in JVM-based backend development.
• Hands-on expertise in Software Engineering using Java, Spring/SpringBoot, Kotlin, Git, Maven, Docker, Jenkins and solid experience with cloud technologies (AWS).
• Experience in leading and driving initiatives and projects.
• Very good conceptual knowledge about RESTful APIs, microservices, event-driven architecture (Apache Kafka), OAuth (Auth0) and testing.
• Involvement in every step of the software lifecycle and internalisation of the DevOps approach ("you build it, you run it").
• Self-organised work as well as collaboration within the team and with other teams at Ratepay to deliver high value to our stakeholders and merchants.
• Very good English language skills.

Location & Eligibility

Due to our hybrid work model, we are looking for candidates based in or near Berlin. Visa or relocation support is not available at this time.

Working With Us

We’re more than just a workplace – we’re a vibrant community of innovators, collaborators, and visionaries who love what we do. Here, your career isn’t just a job. It’s an opportunity to thrive, learn, and make a difference. Benefits include:

• Flexible working hours
• Work remotely (EU for up to 4 weeks a year)
• 28 vacation days per annum
• Financial security including pension plan
• Monthly lunches
• Learning and development through various self-development platforms
• Gym membership or public transport allowance
• Dog-friendly office

Equal Opportunities & Diversity

We value our diversity and welcome everyone to our team. We embrace ownership, growth, integrity, collaboration, customer centricity and inclusion across our 200+ employees and 40+ nationalities.

About Us

Ratepay designs the future of payments. Established in 2009, we are Europe’s leading white-label Buy Now, Pay Later provider handling over 2.5M transactions per month. We operate across Germany, Austria, Switzerland and beyond, delivering direct debit, installments and prepayment options with AI-based risk management. We work with major partners and pride ourselves on teamwork, execution, and continuous improvement.

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