Web3 Jobs in Sofia, Bulgaria

OpenTag is a full-product company on a mission to revolutionize the B2C and B2B gaming industry. We provide operators around the globe with a state-of-the-art platform that serves as a comprehensive solution for all their operational needs.

Our mission is to create the best software through empowered teams, centralized around our product. We do this to help great organizations reach ambitious goals and fulfill their purpose with equally great teams.

We are currently looking for a proactive and experienced Senior Golang Developer to join our dynamic iGaming platform team.

You will:

• Design and build scalable, low-latency distributed services for mission-critical business logic.

• Collaborate with Product Owners, Architects, and R&D leads to define technical solutions aligned with business goals.

• Take ownership of end-to-end software delivery: from technical design to deployment and monitoring in production.

• Lead and participate in code reviews, technical discussions, and knowledge-sharing sessions.

• Drive improvements in code quality, architecture, and system performance.

• Ensure observability and operational readiness from day one: metrics, logging, tracing, and alerting are second nature.

• Introduce modern tools, patterns, and practices to improve developer productivity and system reliability.
  

What We’re Looking For

• 5+ years of backend development experience, including 2+ years working with Golang in production.

• Experience designing and building high-throughput, real-time backend systems.

• Solid knowledge of SQL and NoSQL databases, with hands-on experience in modeling and performance tuning.

• Strong understanding of event-driven architecture and experience with messaging systems like Kafka, NATS, or similar.

• Deep hands-on experience with Docker, Kubernetes, and modern DevOps tooling (CI/CD, IaC).

• Proficient in writing tests (unit, integration, functional) and ensuring system resilience through automation.

• Sound knowledge of software architecture principles: DDD, Clean Architecture, hexagonal architecture.

• Experience with API lifecycle management, including versioning, deprecation, and graceful degradation.

• Familiarity with observability tooling such as Prometheus, Grafana, OpenTelemetry, and distributed tracing systems.

• Fluent with Git (Gitflow), Agile methodologies, and collaboration tools like JIRA and Confluence.

• Upper-Intermediate English or higher, capable of working in an international, cross-functional team.

Nice to Have

• Experience working in regulated, high-availability environments.

• Background in iGaming, particularly with systems related to bonusing, loyalty programs, or payments.

• Involvement in performance optimization, architectural refactoring, or tech leadership initiatives.

• Contributions to open-source projects or internal engineering tooling.

Why Join Us?

• Competitive compensation

• A dynamic, innovative culture offering autonomy and flexibility

• Comprehensive benefits including health insurance, vacation, professional development support, team events, and wellness allowances