Senior Software Engineer

NMI is building a mature, product-oriented Reliability Engineering function, and we’re looking for a Senior Software Engineer to play a key role in that evolution. This role sits on the Reliability Engineering team, which focuses on improving the reliability, performance, and operational maturity of critical platform services. The team’s mission is to move the engineering organization from reactive incident response toward intentional, engineered reliability through strong systems, tooling, and standards. As a Senior Engineer, you will operate beyond a single service or codebase, designing and building reliability frameworks, platform capabilities, and guardrails that improve uptime, observability, and operational confidence. This is a highly hands-on role with strong expectations around technical leadership, ownership, and delivery. Key Responsibilities: • Design and build reliability-focused frameworks, tooling, and standards that improve platform uptime, performance, and operational confidence. • Drive initiatives that move reliability from reactive response to proactive engineering, emphasizing prevention, early detection, and fast recovery. • Partner with engineering teams to embed reliability into system design, development practices, and deployment workflows. • Establish and evolve observability practices, including metrics, logging, alerting, and dashboards that enable clear operational insight. • Identify systemic risks and failure patterns, and lead efforts to address them through automation, architectural improvements, and process refinement. • Contribute hands-on to production codebases, internal tools, and platform services with a focus on long-term maintainability. • Influence technical direction across teams through design reviews, technical proposals, and clear written communication. • Improve operational maturity through better incident practices, po