Senior Engineer, Platform

Happy Co is a company where people can grow their careers and work with like minded people, with no egos or politics. Happy Co is values driven and offers a flexible, supportive culture. Join Happy Co and Make Work Happy!

Happy Co is hiring a Senior Engineer, Platform to help scale the foundational systems that power our products and integrations. This role focuses on improving the reliability, performance, and extensibility of the platform while accelerating delivery of roadmap-critical initiatives.

The position plays a key role in three strategic initiatives:

• Expand our Property Graph to unlock new product capabilities
• Integration reliability and customer visibility to support mid-market adoption and retention
• Plugin and API enablement to accelerate ecosystem expansion

This engineer will operate as a hands‑on senior individual contributor
, owning delivery across platform components including integrations, APIs, and extensibility surfaces. The role requires strong technical judgment, cross-team collaboration, and a focus on measurable production outcomes.

• Design, implement, and maintain scalable platform services and APIs
• Lead delivery of roadmap‑critical platform capabilities including Property Graph and integration surfaces
• Evaluate architectural trade‑offs to ensure reliability, scalability, and extensibility

• Build and improve APIs and plugin frameworks enabling partner integrations
• Ensure integrations operate reliably across customer environments
• Improve visibility and monitoring across integration workflows

• Improve platform reliability, observability, and application performance
• Use production telemetry and monitoring data to diagnose and resolve performance issues
• Reduce operational overhead and improve system resilience

• Work closely with Product Engineering leads and stakeholders to deliver platform capabilities
• Support cross‑team execution for growth and retention initiatives
• Collaborate with product leadership and engineering stakeholders

• Participate in incident response and root‑cause analysis
• Implement preventative improvements based on operational learnings
• Ensure safe rollouts and strong production outcomes

• 6+ years of professional software engineering experience
• Technologies used:
  Golang, Ruby on Rails & Rust
• Strong experience building platform services, APIs, or infrastructure systems
• Experience improving system reliability, observability, and performance
• Demonstrated experience working on distributed systems or complex backend platforms
• Ability to own problems from design through production outcomes
• Strong collaboration skills working across engineering and product teams

• Experience designing graph-based data models or complex domain modeling
• Experience building developer platforms, plugin frameworks, or extensibility systems
• Background working with integration-heavy SaaS platforms
• Experience improving operability and observability of production systems
• Familiarity with cloud-native architecture and distributed systems

• Contribute to at least one roadmap‑critical platform milestone
• Participate in incident response with documented prevention improvements
• Deliver one measurable application performance improvement

• Platform roadmap milestones land with lower execution risk
• Fewer reliability regressions across key integration and API paths
• Faster cross‑team delivery of growth and retention initiatives
• Clear improvements in system performance, observability, and reliability

• Learn the current platform architecture, core service boundaries, and deployment/runtime model
• Build context on high‑impact integration pathways, API surfaces, and reliability pain points
• Get productive with our observability patterns and incident workflow

• Own and ship at least one scoped improvement to an API or integration surface with measurable impact on reliability, throughput, or…