We are looking for a highly motivated and experienced Senior Software Engineer (Java) to join our team. Senior Software Engineer (Java) is responsible for designing, developing, and maintaining scalable, high-performance backend systems that power our products and services. In this role, you will translate business and product requirements into robust technical solutions, ensuring reliability, security, and performance across backend services. You will work closely with cross-functional teams, including frontend developers, DevOps engineers, product managers, lead engineers, and solution architects, to design and implement efficient, scalable, and maintainable backend architectures using modern Java technologies. You will also contribute to architectural discussions, apply best practices, and support the overall quality and sustainability of the codebase. If you are curious by nature, adaptive, collaborative, and always one step ahead, then join us and be a Commencer!
Responsibilities
Design, develop, and maintain scalable and high-performance backend systems using Java and Spring Framework (Spring Boot, Spring MVC, Spring Data, Spring Security, etc.)
Contribute to system architecture decisions and lead the design of both monolithic and microservices-based solutions
Develop and maintain Backend-for-Frontend (BFF) layers and core backend services to support scalable applications
Strong understanding of design principles, design patterns, and architectural best practices (DDD, TDD, and layered architecture)
Build and maintain RESTful APIs and ensure high availability and performance
Collaborate with cross-functional teams including product, design, and QA to deliver high-quality solutions
Ensure code quality through code reviews, best practices, and clean code principles
Write and maintain unit and integration tests
Troubleshoot, debug, and optimize existing systems
Participate in CI/CD processes and support deployment activities
Mentor junior developers and contribute to team knowledge sharing
Stay up to date with emerging technologies and industry best practices
Experience with AI technologies and a strong interest in learning and applying them in real-world use cases
This role requires flexibility in working days to align with client schedules, as some clients operate between Sunday and Thursday.
Qualifications
BSc/MSc/PhD degree in Computer Science or a related field, or equivalent practical experience
At least 5 years of professional experience in backend development with Java Strong experience with Spring Framework (Spring Boot, Spring MVC, Spring Data, Spring Security, etc.)
Strong understanding of OOP principles, design patterns, and scalable system design
Experience with microservices architecture and distributed systems
Hands-on experience with relational and non-relational databases (e.g., PostgreSQL, MySQL, MongoDB, Redis)
Familiarity with message brokers (e.g., Kafka, RabbitMQ) is a plus
Basic knowledge of front-end technologies such as JavaScript, HTML5 and CSS3
Strong unit test and debugging skills
Proficiency in code versioning tools such as Git
Familiarity with CI/CD pipelines and DevOps practices is a plus
Strong sense of analytical thinking and problem-solving skills
Excellent attention to detail
Highly effective time management and multitasking skills
Strong verbal and written communication skills both in English and Turkish
Why Commencis?We want people to thrive at Commencis. Here’s what Commencers like about working here: Competitive Compensation & Benefits: We offer a competitive salary, private health insurance, pension and retirement plans through a company-backed pension system, meal card, commute compensation, work-from-home support, and a paid birthday off. Happier Weekdays: We offer flexible working hours, including a remote working option. Enjoy online events, guest speakers, office refreshments, a meeting-light culture, and many more perks to enhance your weekdays. Never Stop Learning: We support learning and development programs for almost anything. Additionally, we provide access to leading online e-learning platforms like Udemy and various libraries. Community & Socials: We are a tight-knit community that loves gathering together. Our social activities include happy hours, workshops, a New Year party, breakfast & lunch get-togethers, movie nights, and our Summer Festival. Open Culture: We maintain a flat organizational structure with a culture of direct and open communication. We value Commencers’ voices and address any suggestions and questions you may have. About CommencisJoin us in paving the way for a thriving digital society! Commencis has more than two decades of expertise in the world of experience design, software engineering and cloud technologies. Our products and solutions are used by leading brands in financial services, insurance, airlines and retail in more than 20 countries. We help our clients around the globe to commence their next evolution and pave the way for a thriving digital society. We love discovering what’s next. We value collaboration, curiosity, and an open mindset at work. If you share the same passion with our fellow Commencers, then let us unleash your world-class potential! We will process your personal data as part of our recruitment procedures. To find out more, please consult our Candidate Privacy Notices.
