Mid .NET Engineer

FIRST. Best in Sports 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

As a Mid .NET Engineer in our core backend team, you’ll design and build high throughput microservices with .NET Core. You’ll be trusted with services that are central to the company’s business flow, and you’ll help shape our practices around performance, reliability, and scalability.

Responsibilities:

• Design, implement, and optimize backend services in .NET Core
• Own features end-to-end: from design discussions to deployment and monitoring
• Work on performance-critical code paths, focusing on throughput and memory efficiency
• Collaborate cross-team to integrate services into the broader system

Requirements:

• Strong C# / .NET Core experience (3–5 years hands-on)
• Good understanding of distributed systems, microservices, and async programming
• Practical knowledge of performance profiling, debugging, and optimization
• Experience with containerized deployments (Docker, K8s) or message-driven systems
• Proactive, ownership-driven mindset
• Exposure to high-scale or low-latency systems
• Knowledge of metrics/monitoring (Prometheus, Grafana, etc.)
• Interest in memory management, GC tuning, or low-level .NET internals

What do we offer?

• An open-minded environment that values you.
• An international multicultural team.
• Career development.
• An amazing office environment (table tennis, play station, all the fun stuff).
• Food vouchers (180 BGN).
• Additional health insurance.
• Sports card.
• 21 days paid 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 explicitly consent, in accordance with Regulation (EU) 2016/679 (General Data Protection Regulation), to the processing of the personal data contained in your CV, resume, and/or motivational letter strictly for the purposes of the recruitment and selection process conducted by the Company. By applying to this job offer, you also freely and expressly consent to the Company storing your personal data and considering your application for future employment opportunities, in accordance with the Company’s data retention policy and applicable legal requirements. You may withdraw your consent to the processing and/or storage of your personal data at any time, without affecting the lawfulness of processing based on consent before its withdrawal, by contacting sending an email request to the following address: dpo@first.bet

Why we need to process your personal data for another term:

• to be able to contact you when we have a suitable position that matches your profile;
• to be able to send you job offers which might be interested for you;
• to contact you directly, without needing you to go again through the whole selection procedure.

What we will continue to store for you?

• Your name, email, telephone number, social media profile link/s, picture from your CV;
• Your professional experience;
• Your skills, language proficiency, special info from your CV, sent by you.