Bucharest Romania

This is Worldline.

Worldline helps businesses of all shapes and sizes to accelerate their growth journey - quickly simply and securely. We are the innovators at the heart of the payments technology industry shaping how the world pays and gets paid. Our technology powers the growth of millions of businesses across 5 continents. And just as we help our customers accelerate their business we are committed to helping our people accelerate their careers. Together we shape the evolution.

The Opportunity

Worldlines corporate purpose (raison dêtre) is to craft and operate leading digital payment and transactional solutions that enable balanced economic growth and reinforce trust and security in our societies. Worldline makes them environmentally friendly widely accessible and supports social transformation.

Were looking for a C Developer. Ready to share your skills and to challenge your colleagues in an international context link to a Company project!

Day-to-Day Responsibilities

• Design implement and maintain high-performance C modules for real-time transaction authorization.
• Develop low-latency trading/transaction processing paths with robust error handling.
• Integrate with other systems and data stores (Oracle database).
• Implement security controls (encryption authorization) and ensure compliance with PCI-DSS PSD2 and other relevant standards.
• Build and maintain unit integration and performance tests; participate in code reviews.
• Optimize CPU/memory usage latency and throughput; profile and tune critical paths.
• Collaborate with business analysts to translate risk rules and business logic into efficient C implementations.
• Maintain documentation version control practices and CI/CD pipelines.
• Troubleshoot production incidents and provide timely responses.

Who Are We Looking For

We look for big thinkers. People who can drive positive change step up and show whats next people with passion can-do attitude and a hunger to learn and practice this means:

• Strong proficiency in modern C (C11/14/17/20).
• Experience with real-time or near-real-time financial systems; low-latency programming and high-throughput design.
• Solid understanding of financial instruments settlement risk and transaction workflows; knowledge of authorization/risk checks.
• Experience with secure coding practices cryptography basics and secure storage.
• Knowledge of databases and data structures
• Testing and quality discipline: unit tests integration tests performance testing; continuous integration.
• Proactive collaborative with strong problem-solving and communication skills.
• As customer is german speaking and customer tickets are written in german a knowledge of the german language is advantageous.

Perks & Benefits

At Worldline youll get the chance to be at the heart of the global payments technology industry and shape how the world pays and gets paid. On top of that you will also:

• Hybrid Working Policy
• Gift vouchers on the occasion of Christmas/Easter Holidays
• Private medical services
• 21 vacation days/year
• Referral bonuses for new hires recommended by you
• WFH & Flexible Working Hours
• Full access to the Learning platform

Shape the evolution.

We are pushing towards the next frontiers of payments technology and we look for big thinkers to join our journey. People with passion can-do attitude and a hunger to learn and grow. Here youll work with ambitious colleagues from around the world take on unique challenges as a team and make a real impact on the society. And with our empowering culture strong technology and extensive training opportunities we help you accelerate your career. Wherever you decide to go. Join our global team of over 18000 innovators across 40 countries and shape a tomorrow that is yours to own.

Learn more about life at Worldline at

We are proud to be an Equal Opportunity employer. We do not discriminate based upon race religion color national origin sex (including pregnancy childbirth or related medical conditions) sexual orientation gender identity gender expression age status as an individual with a disability or any applicable legally protected characteristics.

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