Senior Fullstack Developer — Java & React

The role 
 

As a Senior Full stack Developer, you will be a hands-on member of a high-performing engineering squad, building and operating business-critical digital services. 
 

This is a backend-led full-stack role. You will use Kotlin or modern Java, ideally Java 17 or later, together with the wider JVM ecosystem, to develop reliable services and APIs. You will also contribute to modern web interfaces using technologies such as React and TypeScript. 

You will work in an increasingly AI-augmented engineering environment. We are looking for people who are curious about AI-augmented engineering and willing to experiment with tools that improve software delivery. You will not be expected to use AI tools every day, but you should be open to applying them where they provide clear value, while validating outputs for correctness, security and maintainability. 
 

Working closely with product managers, designers, engineers, and architects, you will turn product requirements into well-structured, maintainable, production-ready solutions. You will contribute throughout the delivery lifecycle—from technical discovery and implementation through to deployment, production support and continuous improvement. 

You will take ownership of significant features and services, contribute to technical decisions, support other engineers and help maintain high standards of engineering quality. 
 

How you will make an impact 

• Build and maintain reliable JVM-based services using Kotlin or modern Java. 

• Design and develop APIs and integrations following industry standards. 

• Contribute to API design standards and documentation. 

• Deliver complete end-to-end features by connecting backend services and data with responsive web interfaces. 

• Use appropriate test-first and test-informed practices to create effective automated tests. 

• Experiment with AI-assisted engineering tools where they provide clear value, such as exploring solutions, improving tests, documenting systems or investigating issues. 

• Validate AI-assisted outputs for correctness, security, maintainability, and suitability before using them. 

• Contribute to event-driven workflows and asynchronous processing. 

• Participate in technical discovery, spikes, architecture discussions and peer code reviews. 

• Improve build, test and deployment pipelines to support safe and efficient delivery. 

• Embed structured logging, metrics and distributed tracing to make services easier to operate and troubleshoot. 

• Consider the operational, security and governance implications of engineering decisions, particularly in complex or regulated environments. 

• Identify and address technical debt, performance issues and reliability risks. 

• Share knowledge, support collective code ownership and contribute to a collaborative, low-ego team culture. 
   

What's important to us

• Strong commercial experience developing server-side applications with Kotlin or modern Java, ideally Java 17 or later. 

• Good knowledge of the JVM ecosystem and common backend development practices. 

• Experience designing, building and operating APIs. 

• Understanding of service reliability, maintainability, performance and security. 

• Proven experience writing effective automated tests. 

• Practical experience with relational databases. 

• Experience with modern frontend development, ideally using React and TypeScript. 

• Familiarity with CI/CD practices and supporting software in production. 

• Experience working collaboratively in an agile, product-focused engineering team. 

• Curiosity about AI-augmented engineering and a willingness to develop new ways of working. 

• A thoughtful approach to code quality, technical trade-offs and continuous improvement. 
   

Desirable experience 

• Practical experience using AI-assisted development or productivity tools in a software engineering context. 

• Familiarity with asynchronous & event-driven architectures. 

• Experience with frameworks such as Spring Boot, Quarkus, Micronaut or Ktor. 

• Cloud platforms such as AWS, Azure or GCP. 

• Developing with containers 

• Understanding the difference between relational, NoSQL and other persistence technologies. 

• Experience building shared platforms, common services or greenfield technical foundations. 

• Building APIs adhering to design principles such as RESTful API design 

• Building observable systems 

• Experience in regulated or financial-services environments. 

• Exposure to payments, transaction processing or other business domains. 

• Equivalent experience with comparable technologies will be considered. 
   

What success looks like 

In this role, you will: 

• deliver valuable, production-ready features with the squad; 

• build services and APIs that are reliable, reusable and easy for others to consume; 

• improve the reliability, performance and operability of the services you work on; 

• use emerging engineering tools thoughtfully and responsibly where they add value; 

• contribute constructively to technical decisions, API standards and code reviews; 

• help the team release software safely and efficiently; and 

• support a culture of learning, collaboration and shared responsibility. 
   

Working environment 

You will work as part of a cross-functional engineering squad alongside product, design and delivery colleagues. The role is expected to remain substantially hands-on, with opportunities to influence technical direction and support the development of other engineers. 

The role may include working on-site with clients, collaborating directly with client stakeholders and delivery teams to understand their needs, shape technical solutions and support successful delivery. This may involve occasional travel or agreed on-site working, depending on the project and client requirements. 

 

What we offer

• Work life blend: we offer a safe & healthy workplace, with flexible working hours and the possibility to work from home

• Profit share scheme: In addition to your annual salary, you may receive a profit share defined by the company’s success in the previous year

• Global and Diverse Zühlke community: witness how colleagues from all our 16 offices across the globe come together to create a unique, positive and inclusive work culture, learning from one another at annual team camps, and celebrating year-end parties and other local festivities.

• Committed to development: we are committed to the growth of our people and are investing in your development. We’re empowering you to build the skills you need to make a positive impact, both personally and for our clients, today and in the future.

To dive deeper into local benefits of working in Zühlke follow the link  

How to Apply
 

Important* To ensure a smooth review process, please submit all application documents (CV, cover letter) in English only.

AI can help you with your application, but please don't let it do all the talking. We want to understand your experience, your skills and what aligns you to the role. We don't use keyword scanning software, your CV is reviewed by real people, so make sure your application reflects you, not just an AI-generated CV.