Senior Back-End Engineer – Sports Betting in Sofia, Bulgaria. Competitive – discussed at interview.

At a glance

• Location: Sofia, Bulgaria
• Languages: English
• Salary: Competitive – discussed at interview
• Start: ASAP
• Relocation: not offered for this role

About the role

CloserHire is partnering with a fast-growing international technology company within the sports betting and iGaming industry to recruit a Senior Back-End Engineer for their team in Sofia, Bulgaria. This is an opportunity to work on high-performance, real-time sports betting products, building the systems and services that power complex betting operations. You will take ownership of backend development, architecture, integrations, and performance while working in an engineering environment where scalability, reliability

What you'll do

• Design, develop, and maintain high-performance backend services and applications
• Build scalable systems capable of handling high volumes of real-time transactions and data
• Develop and maintain APIs, microservices, and integrations with internal and third-party systems
• Contribute to the architecture and continuous evolution of the company’s sports betting platform
• Work with real-time sports data, betting feeds, pricing, and other platform integrations
• Design reliable solutions capable of supporting significant traffic during major sporting events
• Optimise backend services for performance, scalability, availability, and security
• Design and maintain database structures and data-processing solutions
• Write clean, maintainable, well-tested, and reusable code
• Troubleshoot complex production issues and implement long-term technical solutions

What we're looking for

• 5+ years of professional back-end software development experience
• Strong experience with a modern server-side programming language and its ecosystem
• Solid experience designing and developing RESTful APIs and microservices
• Strong knowledge of relational and/or NoSQL databases such as PostgreSQL, MongoDB, Redis, or similar
• Experience developing high-traffic, high-availability, or real-time applications
• Good understanding of distributed systems, asynchronous processing, and event-driven architectures
• Experience with messaging technologies such as Kafka, RabbitMQ, or similar is an advantage
• Strong understanding of software architecture, design patterns, and clean coding principles Experience with Git, CI/CD pipelines, automated testing, and modern development workflows Familiarity with Docker, Kubernetes, AWS, or other cloud technologies is highly advantageous
• Good understanding of application security, monitoring, logging, and performance optimisation
• Strong analytical and problem-solving skills

Salary

Competitive – discussed at interview

Bulgaria applies a flat 10% income tax, and living costs in Sofia, Plovdiv and Varna run well below Western European levels — the take-home goes considerably further than the headline suggests.

Benefits

• Senior-level position within a growing international sports betting technology company
• Opportunity to develop the core systems behind real-time, high-traffic betting products
• Modern technology stack and engineering-focused working environment
• High level of ownership over backend architecture and technical solutions
• Opportunity to influence scalability, performance, and platform development
• Collaborative international engineering team
• Professional development and career growth opportunities
• Exposure to complex real-time data and high-volume transactional systems
• Opportunity to work with modern cloud, microservices, and distributed-system technologies
• Modern working environment in Sofia, Bulgaria

Why Bulgaria?

Bulgaria is one of the best-value moves in Europe right now — city living at a fraction of Western European costs, an established international community, and a flat 10% income tax.

How the process works

• Apply with your CV — we read every application
• A short introductory call with CloserHire, around 30 minutes
• Interview with the company
• Offer, then we help with the paperwork and, where relevant, the move

From application to starting on the ground usually takes around five weeks.

CloserHire recruits for this role on behalf of our client. We are an equal-opportunity recruiter and consider every applicant on ability alone.