Backend Developer (w/m/d) - Kotlin/Java

Legalhero; Berlin; Hybrid; EUR 60.000 - 80.000; Vollzeit

Zusammenfassung

A legal tech company in Berlin is seeking a (Senior) Backend Developer to design and implement robust server-side architectures. Responsibilities include maintaining high-performance backend services and collaborating with cross-functional teams. Ideal candidates have several years of backend experience and proficiency in Kotlin or Java. This position offers a hybrid work model, flexible working hours, and numerous benefits including a corporate pension scheme and various office perks.

Leistungen

Germany-wide public transport ticket

Dog-friendly office

Corporate benefits platform

20% employer contribution to pension scheme

Regular team events

After-work entertainment options

Free drinks and snacks

Qualifikationen

• Several years of experience as a (Senior) Backend Developer.
• Proficiency in Kotlin, Java, or another JVM-based language.
• Experience with LLM integrations and vector databases.

Aufgaben

• Designing and implementing scalable server-side architectures.
• Developing and maintaining high-performance backend services.
• Collaborating with frontend teams for feature integration.

Kenntnisse

Backend Development

Kotlin

Java

LLM integrations

Vector databases

English proficiency

German language skills

Microservices

Tools

AWS

Kubernetes

MySQL

Jobbeschreibung

What You'll Do

We are looking for a (Senior) Backend Developer who takes ownership and thinks about backend systems from initial concept through to production. Whether you’re building robust APIs, designing high-performance database architectures, or integrating AI solutions, your hands-on mindset and technical judgment make the difference. You will work closely with frontend, product, and AI teams and play an active role in shaping our technical future. As a (Senior) Backend Developer (m/f/d), you will be responsible for:

• Designing and implementing scalable server-side architectures and database models
• Developing, maintaining, and evolving high-performance, secure, and maintainable backend services
• Owning API design, versioning, and lifecycle management
• Collaborating closely with frontend teams to integrate user-centric features
• Building and operating scalable infrastructure for AI workloads and external API integrations
• Ensuring high software quality through automated testing (unit, integration, and end-to-end)
• Actively monitoring and evaluating new technologies and architectural trends

What you bring

Hard Skills

• Several years of experience as a (Senior) Backend Developer
• Strong proficiency in Kotlin, Java, or another JVM-based language
• Solid understanding of modern backend development principles and architectures
• Hands-on experience with LLM integrations (e.g. OpenAI, Anthropic, or comparable APIs)
• Experience working with vector databases (Pinecone, Weaviate, Qdrant) for RAG implementations
• Understanding of prompt engineering, context management, and AI orchestration frameworks (e.g. LangChain, LangGraph)
• Experience with message brokers and queueing systems (e.g. RabbitMQ or similar) is a plus
• Experience with Micronaut, MySQL, AWS, and Kubernetes is an advantage, but not a requirement
• Business-fluent English and good German language skills

Soft Skills

• Openness, courage, and a creative, solution-oriented mindset
• Clear communication and strong alignment with both team and product stakeholders
• High sense of ownership and strong quality awareness
• Enjoyment of working collaboratively in a fast-paced, dynamic environment

What we promise

Work Environment & Flexibility

• Office-first company: Hybrid setup with 3 days in the office and 2 days working from home, offering flexibility in how you structure your work
• Modern, air-conditioned office with plenty of natural daylight
• Central location between Gleisdreieck and Potsdamer Platz with excellent public transport access
• Spacious rooftop terrace with stunning views over Berlin

Benefits

• Full coverage of a Germany-wide public transport ticket
• Dog-friendly office – we’re happy to welcome four-legged team members
• Corporate benefits platform with attractive offers and discounts across many brands
• Company pension scheme with a 20% employer contribution – we invest in your future
• Regular company and team events to strengthen collaboration and team spirit
• After-work fun: Nintendo Switch, PS5, darts, and table football
• Free drinks, fresh fruit, and muesli available at all times

Company Culture & Collaboration

• Agile and modern mindset with open communication – every voice is heard
• Meaningful areas of responsibility with a strong focus on practical, real-world legal solutions
• The opportunity to actively shape our journey and contribute from day one
• Feedback is part of our culture – we believe in continuous, shared growth

Fast Application Process

• Fast feedback
• 1. Approx. 20-minute introductory call with our HR team
• 2. Approx. 60-minute on-site interview with your hiring manager
• 3. Approx. 30-minute meeting with the management team
• A prompt offer following the interview process