Ruby on Rails Developer – Senior
SOFTSWISS is expanding its team and is looking for a Senior Ruby on Rails Developer. The role focuses on building and evolving Ruby on Rails services that power the iGaming platform, including high-throughput APIs, payment and wallet flows, real-time game integrations, and back-office tooling.
SOFTSWISS seeks an engineer who treats AI as a force multiplier, shipping fast with modern tooling while owning the architecture, edge cases, and production behaviour. The successful candidate will contribute to high-load gaming solutions used by millions of players.
- Design, build and evolve Ruby on Rails services that power the iGaming platform: high-throughput APIs, payment and wallet flows, real-time game integrations and back-office tooling.
- Work in an AI-augmented workflow: use coding assistants and agents for scaffolding, refactoring, test generation and code review and take full responsibility for the quality of what gets merged.
- Integrate LLM-based features into the product where they create real value: fraud and risk signals, player-support automation, content generation, internal analytics copilots.
- Own performance and reliability: profile hot paths, tune PostgreSQL queries, design caching and background-processing strategies, and drive incidents to root cause.
- Review code (human- and AI-written alike), mentor mid-level engineers and help set the team’s standards for how AI is used responsibly and effectively.
- Take part in architecture discussions, technical planning and cross-team initiatives.
- 4+ years of commercial Ruby on Rails experience; deep understanding of Ruby internals, Rails conventions and where to break them (required).
- Strong SQL and PostgreSQL skills: indexing, query planning, migrations on large tables without downtime (required).
- Solid grasp of distributed-system fundamentals: message queues, idempotency, eventual consistency, background jobs (Sidekiq or similar), caching (Redis) (required).
- Hands-on experience with AI coding tools in day-to-day work, and a clear opinion on when they help and when they hurt. Ability to evaluate and verify AI-generated code (required).
- Experience designing and consuming REST and/or gRPC APIs; familiarity with OpenAPI (required).
- Confident with Git, CI/CD pipelines, Docker; comfortable reading Kubernetes manifests and logs (required).
- Experience with observability tooling (Prometheus/Grafana, Sentry, OpenTelemetry or similar) (required).
- English at B2 or higher (required).
- Experience integrating LLM APIs (OpenAI, Anthropic, open-weight models) into production Ruby applications – prompt design, structured outputs, evaluation, cost and latency control (nice-to-have).
- Familiarity with RAG pipelines, vector databases (pgvector, Qdrant) or agent frameworks (nice-to-have).
- Understanding of security and data-privacy implications of AI features (PII handling, prompt injection, model output validation) (nice-to-have).
- Experience in fintech, payments or iGaming; knowledge of regulatory and responsible-gaming requirements (nice-to-have).
- Contributions to open-source Ruby projects, talks or technical writing (nice-to-have).
- Working knowledge of Go, Elixir or TypeScript for cross-service work (nice-to-have).
- Private health insurance
- Sports benefits
- Comprehensive Mental Health Program
- Free English lessons (online)
- Local language courses
- Paid time off
- Maternity leave support
- Referral program rewards
- Upskilling, internal workshops, and participation in professional conferences and corporate events
SOFTSWISS is a global tech expert with over 15 years of experience in providing innovative iGaming solutions. The company offers comprehensive software for online casinos, sports betting, and affiliate management. To expand its global presence, in 2024, SOFTSWISS acquired Turfsport, a leading South African betting software provider, and a significant stake in Ously Games GmbH, the company behind the fastest-growing European social casino, SpinArena.net. Additionally, the company appointed Formula 1 legend Rubens Barrichello as Non-Executive Director in Latin America, focusing on Brazil's growing market. SOFTSWISS is committed to transforming the iGaming and entertainment industry for the better through tech innovations. The Team helps operators and providers establish enduring partnerships by building profitable and scalable businesses.