You have experience, a broad view, and deep knowledge – and you have great ambition? You’ve just found your door. We are looking for a Java Developer who is willing to learn and grow fast. We are ready to invest with you in your development, aiming to cover two career levels within the upcoming months – and to get you to a Team Lead level. This position is the first role in the planned Custom Solutions squad. As the founding member, you will shape the squad from the very beginning. You’ll take responsibility—and have fun—with the recruiting process for future team members, together with our HR Recruiting team (after the relevant training and onboarding, of course). You will be deeply involved in defining how things will run. What will the squad do?

• Develop and maintain new containerized services
• Build custom solutions for Zertificon clients based on Z1 standard products and interfaces
• Focus on large enterprise customers

Your influence will boost innovation and success—not just for your team, but for the whole company. Be ready to step into a world of loose boundaries, enabled by Microservices connected via Message Brokers. Want to build your service in Go? Go for it. Found a new concept, framework, or library? Bring it to the table. You'll join a team of open-minded people, looking for kindred spirits. Freedom and responsibility will be part of your daily life.

Professional Java Developer IT-Security (f/m/d) - Transition role to the Team Lead level

Your tasks:

Development and Product

• Transforming and creating a containerized microservice architecture in Java (or other languages)
• Developing new products while combining legacy and monolithic Z1 software with new containerized versions
• Renovating, rebuilding—and making it shine
• Integrating legacy software components (monoliths) into the new product solutions
• Proactively planning and developing enterprise products with your team
• Finding new paths and solutions to strengthen our market position

Alignment with Other Teams

• Aligning your work with other RND teams to ensure a smooth fit in the overall architecture
• Being part of a cross-functional team that isn’t afraid of exploring new technologies or thought patterns

Team Building and Leadership

• Helping to build the team and recruit new members
• Eventually taking on the role of team lead
• Coordinating your team effectively and understanding its capabilities deeply
• Mentoring and guiding team members to deliver the features and results our enterprise customers expect

Miscellaneous / Strategic Thinking

• Analyzing blockers or issues in the development strategy—and preventing them before they happen

Your profile:

• You have a modernization mindset: turning complex legacy into clean, maintainable architecture.
• You have successfully worked in a development team for at least 4 years and successfully managed to deliver solutions and products with that team
• You have at least 2 years of practical experience working with Java. We work mainly with Java11/17/21
• You have deep knowledge and understanding of software architectures like monoliths and microservices.
• You have experience with security, e.g. PKI, S/Mime, OpenPGP, X.509 Certificates, PGP Keys

You are proficient with following technologies:

• Java: Java 11/17/21
• Linux: Basic proficiency in Linux commands
• Shell Scripting: ANSI Shell, Bash
• Frameworks: Spring MVC, Spring Boot, Data, Integration
• Message Brokers: NATS/RabbitMQ/Kafka
• Containerization: Docker, Kubernetes
• Microservice Design: Experience with microservice architecture
• Monoliths: Experience with monolithic applications
• Build Tools: Gradle/Maven
• Software Testing Methodologies
• Ideally, you already have knowledge about Email, SMTP, Java Mail and Bouncycastle
• You have a good level on English (at least B2)

Knowledge with Smart Cards or Hardware Security Modules is not a must, but brings great advantage!

We offer:

• Flexible working hours and home office possible
• Mobility: free Germany ticket, job bike leasing or car parking
• Allowances for food (e.g. Lieferando) and internet in the home office
• Benefits in the office: Roof terraces & green courtyard, organic fruit and drinks, parcel acceptance
• Get-together: pizza Friday in the office, regular team events, big summer party

Why Zertificon?

Zertificon stands for securing digital business. We develop trusted IT security solutions "Made in Germany" – built for businesses that value both protection and usability.

• Independent & committed: For over 20 years, we’ve built secure communication tools – as an owner-managed company with a clear stance
• Purpose-driven: We believe that digital communication must be secure and free. If you think Edward Snowden did the right thing as a whistleblower, we might just share the same values. As a sign of our support, we donate €1,000 to an organization that supports Edward Snowden for every new hire who mentions him in their application
• Hands-on excellence: We take on complex challenges because we can. Our in-house experts are top-tier – even external specialists often learn from us. When we want the best, we build it ourselves
• Agile by conviction: We think fast, act pragmatically, and improve continuously. No bloated processes, no "that’s just how it’s always been done.” Initiative is welcome – but of course, it will be challenged, and not every idea will make it through unchallenged
• Security that works: We build software that’s not only secure, but actually usable – not just for large enterprises with dedicated highly skilled IT teams, but also for small and mid-sized businesses that need strong security without the complexity
• Diverse & international: Our team of 120 people from 30+ countries shares one mission: making secure digital communication easily accessible to businesses of all sizes

If that resonates with you, we’d love to hear from you.

Want to know more? Please have a look at our Work at Zertificon page: https://www.zertificon.com/en/it-jobs-berlin/work-at-zertificon (https://www.zertificon.com/en/it-jobs-berlin/work-at-zertificon)

Questions?

You can reach our HR team at

• 49 30 5900 300-0

jobs@zertificon.com (https://mailto:jobs@zertificon.com)

Bereitgestellt in Kooperation mit der Bundesagentur für Arbeit.