Senior Full Stack Engineer (d/f/m)

Kleinanzeigen; Berlin; Hybrid; EUR 85.000 - 120.000; Vollzeit

Benefits dieser Stelle

Flexible hours

Hybrid work

Parental leave

Extra days off

Pension and life insurance

Personal development budget

Learning opportunities

Transportation allowance

Discounts

Referral program

Free shipping on Kleinanzeigen Direktk

Corporate benefits

Zusammenfassung

Kleinanzeigen is looking for an experienced software engineer to join a hybrid team based in Berlin Charlottenburg. You will work on end-to-end features spanning the Spring Boot backend and Astro/React frontend, driving growth-oriented initiatives and scalable architectures.

The role emphasizes collaboration with product, data, and business teams, with a focus on quality, observability, and maintainability. This is a growth-focused position in a dynamic ecommerce environment.

Qualifikationen

• 5+ years of professional software development experience.
• Proven track record of AI-supported delivery in backend and frontend.
• Experience in growth, ecommerce, or B2B platforms.

Aufgaben

• Full-stack feature development across Spring Boot backend and Astro/React frontend.
• Growth experiments and data-driven optimizations affecting subscriber growth.
• Designing APIs, data models, and integration patterns with security and cost in mind.
• Collaborating with Product, Business Development, and Data teams to translate growth hypotheses into tech solutions.
• Mentoring and establishing testing standards, monitoring practices, and quality benchmarks.

Kenntnisse

Java

Spring Boot

REST APIs

PostgreSQL

JavaScript/TypeScript

React

Astro

TailwindCSS

Kafka

CI/CD

Cloud basics

Observability

Microservices

Tools

CI/CD pipelines

Observability tools

Cloud platforms

Jobbeschreibung

Job Description

We have a hybrid role, and our office is based in Berlin Charlottenburg.

Job Requirements

Your profile

• 5+ years of professional software development experience
• Proven track record of AI-supported delivery in backend and frontend
• Experience working in cross-functional product teams, ideally in growth, e-commerce, or B2B platforms
• Solid backend experience with Java and Spring Boot ecosystem, building RESTful APIs and working with relational databases (e.g. PostgreSQL)
• Strong experience with modern JavaScript/TypeScript, React, and contemporary frontend tooling. Familiarity with Astro, TailwindCSS, or similar frameworks is a plus
• System thinking: Understanding of microservices architecture, event-driven systems (Kafka), API design principles, and distributed system patterns
• DevOps awareness: Experience with CI/CD pipelines, observability tools (monitoring, logging, metrics), and cloud infrastructure basics

Ways Of Working

• Product mindset: You connect technical decisions to business outcomes, understand how to balance speed with quality, and can identify systemic risks in growth-focused development
• Communication: You explain technical trade-offs clearly to non-technical stakeholders and foster alignment across teams and functions
• Ownership: You take responsibility for your systems' long-term health, considering dependencies, costs, and maintainability in your decision-making
• Growth mindset: You seek feedback proactively, stay current with emerging technologies (especially AI-assisted development tools), and contribute to team learning

This role

Job responsibilities

• Full-stack feature development: Design and implement end-to-end features across our Spring Boot backend services and Astro/React frontend applications, ensuring scalability, performance, and maintainability
• Growth experimentation: Build and iterate on conversion-focused features, A/B testing infrastructure, and data-driven optimizations that directly impact our subscriber growth metrics
• System design and architecture: Shape technical solutions for complex growth features, making informed decisions about API design, data modeling, and integration patterns while considering security, cost, and long-term maintainability
• Cross-functional collaboration: Partner closely with Product, Business Development, and Data teams to translate growth hypotheses into technical solutions, communicating trade-offs clearly and driving alignment
• Technical excellence and mentoring: Establish testing standards, monitoring practices, and quality benchmarks for growth initiatives. Share knowledge and mentor team members in full-stack development practices

Job benefits

At Kleinanzeigen, we care about our people — their wellbeing, growth, and life beyond work. Our benefits are designed to support you holistically, giving you flexibility and opportunities to thrive.

Flexibility

• Flexible working time (hybrid)
• 20 days “work from anywhere”
• Paid additional parental leave for both parents
• Extra paid days off for special occasions (e.g. your wedding or a move)

Wellbeing & Support

• Confidential support & coaching for you and your loved ones
• Annual company sports events
• Pension and life insurance

Growth & Development

• Personal development budget
• Learning opportunities to grow your skills and career

Perks & Everyday benefits

• Corporate benefits and exclusive discounts
• An attractive referral program
• Transportation allowance
• Free shipping on Kleinanzeigen Direktkauf

Kleinanzeigen is an equal opportunity employer that values diversity and inclusion. We welcome people of all backgrounds, races, religions, colours, national origins, gender identities, sexual orientation, ages, marital status, or disability.

If this role sparks your interest but you’re not sure you meet every single requirement, we’d still love to hear from you anyway.