Lead Java Developer

Acid Tango is a digital product studio. We transform our clients' ideas into digital products, with a focus on digital innovation and bringing disruptive ideas to life. In every project, we search for the perfect harmony between simplicity, aesthetics, and technology.

We're currently looking for a Lead software developer with solid Java expertise to join us. You'll bring experience in complex architectures and large-scale data systems, and you'll lead a team of talented developers building products that matter.

What you'll do

• Inspire, motivate, and lead senior and junior developers, fostering a culture of technical excellence and continuous learning.
• Work closely with our design team and clients to deliver beautiful, thoughtful, and effective products that have a real impact on their business.
• Drive the technical evolution of our clients' projects, from architectural decisions to day-to-day implementation.
• Champion high-quality engineering practices: TDD, clean code, code reviews, pair programming, and continuous refactoring.
• Define and evolve software architectures based on Domain-Driven Design (DDD) and Hexagonal Architecture principles, ensuring our codebases stay maintainable, testable, and aligned with business needs.
• Prioritize and coordinate code improvement initiatives across the team.
• Bring your ideas and knowledge to help us keep raising the bar.

What we're looking for

• 5+ years of experience in software development with Java.
• Strong command of the Spring Boot framework.
• Passion for software craftsmanship and clean, maintainable code.
• Deep knowledge of object-oriented programming, algorithms, and software architecture.
• Hands-on experience with Test-Driven Development (TDD) as a daily working practice.
• Solid understanding of Domain-Driven Design (DDD) : bounded contexts, aggregates, ubiquitous language, and strategic design.
• Practical experience designing and building applications with Hexagonal Architecture (Ports & Adapters) or similar approaches such as Clean Architecture or Onion Architecture.
• Significant back-end experience with Java, with a clear understanding of its strengths and trade-offs.
• Experience designing and exposing APIs (REST and ideally event-driven).
• Solid SQL skills and working knowledge of PostgreSQL, plus familiarity with non-relational databases such as Redis and MongoDB.
• Confident with Git, Linux environments, and the command line.

Nice to have

• Experience with CQRS, Event Sourcing, or asynchronous messaging (Kafka, RabbitMQ).
• Exposure to microservices and distributed systems.
• Familiarity with CI/CD pipelines and observability tooling.

What we offer

• Competitive salary by level: Senior (35–45K), Architect (45–55K), Tech Lead (55–65K).
• Performance-based bonus of up to 12% of your salary.
• €1,000/year education budget to keep growing.
• Flexible working hours and the option to work from home.
• €300 to improve your home setup.
• Challenging projects with a focus on innovation.
• A dynamic, diverse team that wants to leave a mark.
• International clients with thousands of users.

If you think you'd be a good fit, we'd love to talk. ;-)