Senior Software Engineer for Timisoara or Sibiu m/f/d

About ATOSS ATOSS Software SE is one of Germany’s most successful tech growth stories. As the market leader in Workforce Management Software, we help companies work more intelligently, creatively, and humanely optimizing the balance between profitability and people. We’re a rare company: according to Handelsblatt (10/24), just 309 public companies worldwide achieved over 20% return on sales for ten consecutive years. Only two are based in Germany and ATOSS is one of them. With 20 years of record-breaking growth, over €2 billion market cap, and listings in SDAX and TecDAX, we’re scaling globally and we’re growing. If you’re ready to drive impact in a high-performing B2B SaaS environment, this is your chance to elevate your career. The Person You are At ATOSS, we hire for both character and skill , seeking individuals who embody resilience, a pioneering spirit, and the passion to grow. We value those who: Think like entrepreneurs – taking ownership, pushing boundaries, and driving impact. Challenge the status quo – bringing fresh ideas and bold execution to the table. Thrive in change – seeing growth as a lifelong journey, both professionally and personally. The Role As a Senior Software Engineer in one of our Scrum teams, you will actively shape and evolve our enterprise product ASES in the Time & Attendance domain. Your team consists of ~10 people from our 250-person department. You help us roll out and improve our new time evaluation and wage calculation engine to bring value to our customers in different markets and industries. Whether or not you grow into a leadership role or not, we are looking for senior engineers who demonstrate strong ownership, technical leadership and accountability for outcomes. Why this role is exciting, impactful and challenging This role goes beyond implementing features. You will work on a mature, mission-critical enterprise system with complex domain logic, long-lived codebases, and high expectations for correctness and stability. Your work directly supports the daily work and affects the incomes of hundreds of thousands of employees, making stability and reliability essential – and giving you the opportunity to create real, lasting value at scale. Decisions often have long-term impact and require balancing technical quality, business constraints, and delivery pressure. Success in this role requires a strong sense of ownership, the ability to navigate complexity, and the willingness to take responsibility for outcomes and not just code. Team & Organization • You'll be part of a Scrum team of ~10 engineers. • Our Engineering department consists of 250+ professionals across multiple teams and fields. Key Responsibilities: 1. Ownership of Technical Solutions Design, implement and maintain core software components end-to-end Own delivery of both short- and long-running initiatives Ensure high quality through sound engineering practices and reviews Proactively drive improvements and innovation in the product and the organization Contribute to developing AI-powered agents and features – both as an integral part of our product and as internal tooling 2. Driving architectural decisions Lead and influence architectural decisions that align with business goals Balance short-term delivery with long-term sustainability 3. Stakeholder management and Communication Confidently engage with internal and external stakeholders at different levels Communicate clearly and effectively: present, align, negotiate and listen Translate between technical and non-technical perspectives 4. Mentorship and leadership Support and mentor fellow team members Optionally grow into a technical and/or people leadership role Key Requirements: Proven track record of ownership of complex technical solutions Demonstrated experience in leading projects or acting as a technical lead 6+ years of professional experience in software engineering Experience with AI-assisted development tools (e.g. Claude Code) Skills & Competencies: In-depth knowledge of Java We work with Spring Boot, SQL, Kafka, Azure, Claude and others - but we value conceptual knowledge over concrete technologies and frameworks Strong understanding of software architecture; Cloud-native application architecture is a plus Fluent in English (spoken and written); knowing German is a plus Experience in developing AI agents is a strong plus Education: Bachelor’s / master’s degree in computer science or a related field. Our Benefits Onboarding : HR Induction, Newbies-Day, Training for our internal products & Buddy-Program Benefits : meal vouchers, performance bonus, recommendation bonus, voluntary company bonus, free parking at our VOX Technology Park location in Timisoara, Bookster for bookworms, gaming rooms & rooftop access in Timisoara Company culture : flexibility through HYBRID working style (50% work from home), 25 vacations days from start, Diversity & Inclusion Team – culture talks, company event (Halloween/Christmas/ Summer party, team buildings), Barista corner in Timisoara, fresh fruit & sweets day after every release cycle, relocation package for those who wish to move to Timisoara/Sibiu Career and development: career model with Expert- & Leadership Track, LinkedIn Learning, German language course if department requires, Java and Scrum certifications Health Initiatives: medical subscription with a national-wide medical provider, 7Card for fitness activities, engagement events for employees Stability & Growth: Company listed on SDAX & TecDAX, with 19+ years of record-breaking revenue and a 30%+ EBIT margin. Certified Top Employer© for the 5th year in a row. 2 locations in Romania : TIMISOARA – VOX Technology Park | Calea Torontalului nr 69 | building B and SIBIU Str. Nicolaus Olahus | No.5 | Business Center Sibiu | Building B | Ground Floor Standard contract: CIM At ATOSS, great talent knows no limits. We welcome professionals from all backgrounds and empower their growth through an inclusive, skill focused environment. Join us and be part of a high-growth, future-focused company!