Senior C++ Developer
Confirmed on the employer's own hiring board on Oct 16, 2026. First seen by Alion on Oct 16, 2026.
Who we are
flatexDEGIRO SE operates the leading and fastest growing online brokerage platform in Europe. Based on modern, in-house state-of-the-art technology, customers of the flatex and DEGIRO brands are offered a wide range of independent products with execution on top TIER 1 exchanges. The technological edge, high efficiency and strong economies of scale enable us to continuously improve our service offering for clients and to set leading standards in terms of product, price and platform quality.
With more than 3,5 million customer accounts and more than 75 million securities transactions processed in 2025, flatexDEGIRO is the largest retail online broker in Europe. In times of bank consolidation, growing digitalization and the immanent need of millions of Europeans to take their financial future into their own hands, flatexDEGIRO is ideally positioned for further profitable growth.
Want to know what it’s like to work for flatexDEGIRO?
Check out our Instagram @lifeatflatexdegiro and meet the great people that makes us who we are! Do you already see yourself as part of this team? Apply!
We’re looking for a Senior C++ Developer who thrives in high-performance backend environments, enjoys building clean and scalable architectures, and wants to influence how quality and reliability are built into mission-critical trading systems from day one. You’ll work in a modern environment where AI-supported tools are encouraged to boost productivity, code quality, and analysis. If you enjoy owning the performance and reliability of systems end-to-end and shaping how teams build and test software, this role is for you.
You bring us these skills:
- Minimum 4 years C++ development experience;
- At least Bachelor’s degree in Computer Science or similar;
- Python for test automation;Kafka/Redis for communicating with scalable components;
- Docker/k8s/helm, anything for a modern CI/CD environment (Jenkins/GitLab);
- Growth mindset, there is always something to be improved, and that's fine;
- Thrive in an environment that leverages best in class AI tooling to work more efficiently without sacrificing quality of outputs;
- Fluent in English.
This is what you’ll do:
- Process thousands of incoming trades in a fraction of a second;
- Service talks directly to stock exchanges, and cleverly assesses each transaction;
- Make stuff that is used by tons of people around the world;
- Love showing what you and your squad have created every sprint;
- Coach your back-end buddies in being better, stronger, faster;
- Improve coding standards, developer tools, and everything else a great developer needs.
Interested? This is what we offer you:
- Promise of a good work-life balance
- 30 days paid leave
- Personal and professional development with access to relevant courses
- Opportunities for career development
- Additional health insurance Luxe package (covering children under 18, dental and vision care)
- Best Doctors’ health insurance providing access to the best medical treatment worldwide*
- A challenging full-time job in an international and fast-growing company;
- A competitive salary
- Food vouchers (102 EUR net)
- The opportunity to participate in a new, enthusiastic team of likeminded professionals
*The insurance is available for individuals who have obtained permanent resident status in Bulgaria and have resided in the country for more than 183 days within the last 12 months
To make your life easier
You’ll enjoy the flexibility of our hybrid working model, which allows you to work both from home and from the office, with at least 50% of the time spent onsite. We truly value time together in the office - it’s a great opportunity to connect, collaborate, and exchange ideas with colleagues.
When you’re in, you can enjoy fresh fruit, good coffee, drinks, and snacks every day. Our modern Office X workspace is conveniently located in the southern part of Sofia with excellent transport connections, offering a comfortable and inspiring environment designed for collaboration and productivity.
To make working from home comfortable we offer a 25 EUR net internet allowance, provide a company laptop and many options to make your work@home comfortable, such as a chair, screen and headphones. And last but not least: a fully covered Sports card we provide is an easy way to get into shape!
Want to invite your friends to work for us as well? A generous referral bonus will be yours if they get hired, so spread the word once you start.
All qualified applicants will receive consideration for employment without regard to ethnicity, color, religion, age, sex, national origin, disability, sexual orientation, gender identity/expression, or any other legally protected status. flatexDEGIRO is an Equal Opportunity Employer.
flatexDEGIRO Sofia Branch
Petar Patev
Corporate Recruiter