Java Developer (f/m/d) – Secure Communication Services

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. Tired of marketing fluff? So are we. This is why we like to keep our job descriptions short and sweet, telling you just the most important aspects of the position for you to make an informed decision whether to apply for this role. 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 servicesBuild custom solutions for Zertificon clients based on Z1 standard products and interfacesFocus on large enterprise customersYour 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) at an established IT-Security Company - Transition role to the Team Lead level Your responsibilities will include: 🔧 Development and ProductTransforming and creating a containerized microservice architecture in Java (or other languages)Developing new products while combining legacy and monolithic Z1 software with new containerized versionsRenovating, rebuilding—and making it shineIntegrating legacy software components (monoliths) into the new product solutionsProactively planning and developing enterprise products with your teamFinding new paths and solutions to strengthen our market position🤝 Alignment with Other TeamsAligning your work with other RND teams to ensure a smooth fit in the overall architectureBeing part of a cross-functional team that isn’t afraid of exploring new technologies or thought patterns👥 Team Building and LeadershipHelping to build the team and recruit new membersEventually taking on the role of team leadCoordinating your team effectively and understanding its capabilities deeplyMentoring and guiding team members to deliver the features and results our enterprise customers expect🧠 Miscellaneous / Strategic ThinkingAnalyzing 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 teamYou have at least 2 years of practical experience working with Java. We work mainly with Java11/17/21You 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 11/17/21Linux: Basic proficiency in Linux commandsShell Scripting: ANSI Shell, BashFrameworks: Spring MVC, Spring Boot, Data, IntegrationMessage Brokers: NATS/RabbitMQ/KafkaContainerization: Docker, KubernetesMicroservice Design: Experience with microservice architectureMonoliths: Experience with monolithic applicationsBuild Tools: Gradle/MavenSoftware Testing MethodologiesIdeally, you already have knowledge about Email, SMTP, Java Mail and BouncycastleYou 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! Our offer: Flexible working hours and home office possibleMobility: free Germany ticket, job bike leasing or car parkingAllowances for food (e.g. Lieferando) and internet in the home officeBenefits in the office: Roof terraces & green courtyard, organic fruit and drinks, parcel acceptanceGet-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 stancePurpose-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 applicationHands-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 ourselvesAgile 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 unchallengedSecurity 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 complexityDiverse & 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 Questions?You can reach our HR team at+49 30 5900 [email protected]