FIRST. is a dynamic and innovative global technology company that provides B2B SaaS solutions for online sports platforms. We are at the forefront of innovation, empowering gaming partners with revolutionary sportsbook solutions. Our cutting-edge sportsbook software, premium data feeds, and unwavering commitment to partner success are reinventing the gaming industry. About the role We are looking for a Strong Middle / Senior JavaScript Developer with a focus on Back-end to join our fantastic engineering team. Our server architecture is micro-services based, running on JavaScript/TypeScript using Nest.js framework with MongoDB and Pulsar as a queue-based communication. A bit about your future role Develop and maintain API-based projects Collaborate with team members to design and implement new features Optimize applications for performance and scalability Troubleshoot and debug issues Write clean and maintainable code What we are looking for Solid experience in NodeJS development Proficiency in JavaScript (ES6+) Experience with NestJS Good understanding of RESTful APIs A proactive mindset - genuine motivation and enthusiasm to build and grow Good communication and teamwork abilities Good verbal and written English communication skills (we are a multi-national team) Excellent analytical and problem-solving skills What will help you succeed Experience running mature API products in production University degree in Computer Science, Software Engineering, or Mathematics Experience with high-load architecture Experience with Pulsar, Aerospike What do we offer An open-minded environment that values you An international multicultural team Career development An amazing office environment Food vouchers (95 EUR) Additional health insurance Sports card Up to 24 days of paid annual leave Flexible working hours Manicure, massage, breakfast, and snacks in the office Wedding and new baby bonus Team building activities If you are interested in joining our diverse and dynamic team, we are looking forward to your application. Only short-listed candidates will be contacted. Confidentiality of all applications is assured! By submitting your application, you acknowledge that the Company will process the personal data contained in your CV, résumé and/or motivational letter for the purposes of managing the recruitment and selection process, in accordance with Regulation (EU) 2016/679 (General Data Protection Regulation), applicable data protection legislation and the Company’s Recruitment Privacy Notice. Providing this consent is entirely optional and will not affect your application for the current position. You may withdraw your consent to the retention and use of your personal data for future employment opportunities at any time, without affecting the lawfulness of processing carried out before its withdrawal, by sending an email request to [email protected] . As part of the application form, you will also be asked whether you agree to the Company retaining and using your personal data beyond the applicable six-month retention period, for a total period of up to 24 months following the completion of the recruitment process, so that you may be considered and contacted for future employment opportunities.