Senior Software Engineer - Fullstack (m/f/d)

DUDE CHEM; Berlin; Vor Ort; EUR 90.000 - 120.000; Vollzeit

Zusammenfassung

Ratepay is seeking a Senior Software Engineer (m/f/d) to build secure, scalable Buy Now, Pay Later products for leading German retailers. You will own backend systems in a microservice architecture and collaborate across Product, Infrastructure and Risk teams.

Join a fast-growing fintech environment with a DevOps mindset, on-call responsibilities, and opportunities to mentor peers while driving innovation and technical excellence.

Qualifikationen

• 6+ years of hands-on Java backend development.
• Kotlin is a plus.
• Solid frontend skills with Vue.js or similar.
• Proficient in Spring/Spring Boot, Docker, Git, and Maven.
• Experience deploying apps in cloud environments, ideally AWS.
• Strong PostgreSQL knowledge; MongoDB/Redis a plus.
• Understand RESTful APIs, OAuth2, event-driven architectures (Kafka), microservices.
• Familiar with Kafka Streams and contract testing tools like PACT.
• Comfortable in agile teams and DevOps mindset.
• Experience in fintech or risk-related systems is a plus.

Aufgaben

• Own design, development, operation and improvement of systems for performance and stability.
• Integrate internal and external APIs in a microservice architecture.
• Collaborate with Product, Infrastructure and Risk in agile processes.
• Mentor junior engineers and share knowledge.
• Bring ideas to challenge status quo and drive innovation.
• Ensure operational success of services and participate in on-call.

Kenntnisse

Java backend

Kotlin

Vue.js frontend

Spring Boot

Docker

Git

Maven

AWS

PostgreSQL

MongoDB/Redis

REST APIs

OAuth2

Kafka

Microservices

Kafka Streams

PACT

Agile

DevOps

Fintech risk

Tools

Docker

Git

Maven

AWS

Jobbeschreibung

Your Mission

At Ratepay, we develop next-generation payment solutions that power the checkout experience for some of Germany’s largest online retailers and marketplaces. As a Senior Software Engineer (m/f/d), you’ll play a key role in building secure, scalable, and user-friendly Buy Now, Pay Later products in a dynamic and fast-growing e-commerce sector.

You’ll join a collaborative, agile team dedicated to enabling seamless commercial and technical onboarding of merchants, marketplaces, and resellers. Our focus is on modern integrations, fast onboarding, and intuitive configuration—making it easy for merchants to go live quickly while also improving the experience for internal Ratepay teams involved in the process.

Your Key Responsibilities:

• You take ownership of the design, development, operation and continuous improvement of our systems, ensuring high performance and stability.
• You integrate internal and external APIs within a modern microservice architecture, with scalability and maintainability in mind.
• You contribute actively to our agile software engineering process, collaborating with cross-functional teams including Product, Infrastructure, and Risk.
• You mentor and support junior engineers, sharing knowledge and fostering a culture of learning and growth.
• You bring in your ideas and technical experience to continuously challenge the status quo and drive innovation within the team.
• You will be responsible for operational success of the teams services also being on call.

That's What You Bring Along

• You have 6+ years of hands-on experience in Java backend development, with Kotlin being a plus.
• You possess solid frontend skills using Vue.js or another modern JavaScript framework.
• You are proficient in Spring/Spring Boot, Docker, Git, and Maven.
• You have experience building and deploying applications in cloud environments, preferably AWS.
• You have strong database knowledge, especially with PostgreSQL, and some familiarity with MongoDB or Redis is a plus.
• You understand RESTful APIs, OAuth2, event-driven architectures like Kafka, and microservices.
• Ideally, you are familiar with Kafka Streams and contract testing tools such as PACT.
• You are comfortable working in agile teams and embrace a DevOps mindset: “you build it, you run it.”
• Experience in fintech or risk-related systems would be an additional advantage.

That's How Working With Us Will Be

At Ratepay, you’ll work in an environment built on trust, ownership, and collaboration. We believe in empowering engineers with autonomy, modern tooling, and the space to make meaningful technical decisions. You’ll work closely with experienced colleagues from diverse backgrounds, benefit from transparent communication, and have the opportunity to grow both personally and professionally. We value balance, flexibility, and a healthy work culture—because great products are built by teams that thrive.

Equal Opportunities & Diversity

We value our diversity and welcome everyone to our team. Regardless of ethnic and social background, religious views, worldview, gender, sexual orientation, physical and mental limitations, age, marital status, educational background, and nationality. With over 200 employees and 40 different nationalities, we take our values seriously. These include; ownership, growth, integrity, collaboration, customer centricity and inclusion.