Senior Golang Developer

📍 Location: Sofia, Bulgaria | Hybrid This role is open to candidates currently based in Bulgaria. We are unable to consider candidates based outside the country or requiring relocation to 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. Job requirements 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.AI mindset and adaptability: comfortable leveraging AI tools in the software development lifecycle to accelerate development, explore solutions, improve code quality, and automate repetitive tasks, while critically evaluating and validating AI-generated output. 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. What do We offer? An inspiring workspace with awesome teammates and a great vibeLearning opportunities with a dedicated training budget to level up your skills25 vacation days + an extra day off to celebrate your birthday 🎉Premium health insurance for your peace of mindBirthday vouchers and little surprises along the wayFree snacks, team lunches, and great coffee (because fuel matters ☕)Sports card, transportation, and food allowanceQuarterly team events that bring everyone together Excited to join us? Click the Apply button and let’s build something amazing together!