Senior Back End Engineer (Ruby on Rails & GO)
$175,000–$185,000 year
RemoteUnited States
Job Summary
Design and own backend services across Ruby on Rails monoliths and Go microservices, implementing features from API contracts through deployment and monitoring. Support the migration to microservices by decomposing the Rails codebase, managing dual-write patterns, and contributing to architectural decisions. Build internal tooling APIs for Game Ops, Trading, and Risk teams to handle projection management, risk dashboards, and member operations. Lead end-to-end delivery of complex features, diagnose performance bottlenecks, and optimize database queries to improve system resilience. Mentor engineers through code reviews and pairing while advocating for best practices in testing, observability, and CI/CD. Participate in on-call rotation to address production incidents and drive long-term reliability improvements.
Required Qualifications
- 5–8 years of professional software engineering experience
- meaningful production time in both Ruby on Rails and Go
- Proven track record of owning and delivering complex, multi-component features in a team environment
- Experience working across monolith-to-microservices migrations
- extracting services
- managing dual-write patterns
- maintaining backward compatibility
- Experience designing and operating distributed systems or event-driven architectures
- Strong Rails proficiency
- understanding of the framework deeply
- write idiomatic Ruby
- know when to leverage or work around Rails conventions
- Strong Go proficiency
- write idiomatic, well-tested, production-quality Go code
- Solid PostgreSQL skills
- schema design
- query optimization
- performance tuning
- Solid understanding of API design
- REST and/or gRPC
- service boundary design
- Experience with asynchronous workflows
- background job processing (Sidekiq or similar)
- message queues
- event streaming
- Experience with containerization (Docker)
- orchestration (Kubernetes)
- Familiarity with CI/CD pipelines and deployment automation
- Understanding of observability practices
- logging
- metrics
- tracing
- Comfortable working autonomously with minimal direction on ambiguous problems
- Effective communicator who can articulate technical decisions to both engineers and non-technical stakeholders
- Able to context-switch between deep technical work and collaborative planning
- Experience working in a fully remote engineering organization
- Hands-on experience with event-driven architectures using Pulsar, Kafka, or similar
- Experience with NATS request/reply or JetStream patterns
- Familiarity with infrastructure tooling (Terraform, Kubernetes, ArgoCD)
- Experience in the daily fantasy sports or sports betting industry
- Experience leveraging AI-assisted development tools across the development lifecycle
- coding
- planning
- scoping
- code review
- Experience integrating AI tooling into engineering workflows to accelerate team productivity
- Must be authorized to work for any employer in the U.S.
- Must be available for on-call rotation
- Share responsibility for production incidents
- contributing to root cause analysis
- long-term reliability improvements
- Participate in on-call rotation
Desired Qualifications
- Experience in high-traffic, real-time systems — sports, gaming, fintech, or adtech
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