Senior Engineer, Platform

HappyCo is a company where people can grow their careers and work with like minded people, with no egos or politics. HappyCo is values driven and offers a flexible, supportive culture. Join HappyCo and Make Work Happy!  The Position HappyCo 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. What you'll do (day to day) Platform Architecture & Development Design, implement, and maintain scalable platform services and APIs Lead delivery of roadmap-critical platform capabilities including Property Graph and integration surfaces Evaluate architectural tradeoffs to ensure reliability, scalability, and extensibility Integration & Ecosystem Enablement Build and improve APIs and plugin frameworks enabling partner integrations Ensure integrations operate reliably across customer environments Improve visibility and monitoring across integration workflows Reliability, Observability & Performance 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 Cross-Team Collaboration 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 Production Ownership Participate in incident response and root-cause analysis Implement preventative improvements based on operational learnings Ensure safe rollouts and strong production outcomes What were looking for Required Qualifications 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 Preferred Qualifications 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 How we measure success First 90 Days Contribute to at least one roadmap-critical platform milestone Participate in incident response with documented prevention improvements Deliver one measurable application performance improvement Longer-Term Success 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 Keys to optimum happiness at HappyCo Thrives in ambiguity and proactively builds clarity Focuses on long-term impact over quick wins Enables others through systems, not mandates Leverages technology and AI to empower people and simplify complexity Embraces the challenges and rewards of growing in a scaleup environment Timeline Expectations First 30 days: 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 First 60 days: Own and ship at least one scoped improvement to an API or integration surface with measurable impact on reliability, throughput, or operability Improve instrumentation and alerting for an existing platform workflow First 90 days: Contribute to at least one roadmap-critical platform milestone Participate in at least one incident with documented prevention follow-through Deliver one measurable application performance improvement Lead a meaningful cross-team implementation slice in platform scope and ship iteratively First 12 months: Platform milestones land with lower execution risk; fewer reliability regressions on key integration and API paths Faster cross-team delivery of growth and retention priorities Clear improvements in system performance, observability, and reliability Raised bar on operational quality through documentation, standards, and collaborative execution