Job Title: Senior Staff Software Engineer (Engineering Lead)

Company Name: Proximity Careers

Job Details: RemoteFull,Time

Job Url: https://hiring.cafe/viewjob/pi4lznp5cg9lx4b8

Job Description: Posted 2d agoSenior Staff Software Engineer (Engineering Lead)@ Proximity CareersView All JobsUnited StatesRemoteFull TimeResponsibilities:architect systems, lead data, ensure reliabilityRequirements Summary:10+ years software engineering, 3+ years in lead/architecture roles; strong C#/.NET, Azure, AWS, data and distributed systems expertise.Technical Tools Mentioned:C#, NET 8+, Azure, AWS, Azure Container Apps, AWS S3, Azure Data Factory, MassTransit Sagas, OpenTelemetry, Azure Monitor, Azure Managed Grafana, YARP, SQL, Entity Framework Core
The OpportunityProximity is seeking a Senior Staff Software Engineer / Engineering Lead to drive the architectural evolution of our cloud-native platform. This is a high-leverage player-coach role: you will define engineering standards, architect high-volume distributed systems, and lead a US-based team of engineers through complex technical challenges.You’re not just a lead — you’re a technical authority. You understand what happens to a database index when a table hits a billion rows. You can diagnose why a distributed transaction failed before you even open the logs because you helped design the system and its observability. You operate with the urgency to stabilize production systems, and the long-term perspective to build a platform that scales.Core Responsibilities1. Architectural Strategy & Cloud LeadershipArchitect and implement scalable microservices using .NET Aspire and Azure Container Apps, ensuring reliable service discovery, resiliency, and operational simplicity.Design hybrid cloud data strategies, managing complex ETL pipelines between AWS S3 and Azure Data Factory that handle terabytes of data with automated retries, resilience and binary copy resumption.Define the "Golden Path" for development, utilizing YARP as a strategic Backend-for-Frontend (BFF) to manage traffic routing, protocol upgrades, and legacy system strangulation.2. High-Volume Data EngineeringOwn the database architecture for high-load systems. Implement declarative partitioning (range/hash) strategies to maintain sub-millisecond query performance on datasets exceeding 1 billion rows.Optimize Entity Framework Core and SQL queries to ensure efficient partition pruning, preventing I/O bottlenecks.Manage the lifecycle of heavy data loads, ensuring zero-downtime migrations and non-blocking maintenance operations (e.g., VACUUM/ANALYZE).3. Distributed Systems & ReliabilityImplement eventual consistency patterns using MassTransit Sagas (state machines) to orchestrate complex, long-running business transactions across microservices.Enforce the Transactional Outbox pattern to guarantee message reliability, idempotency, and correctness in an event-driven architecture.Secure the infrastructure using Azure Private Link and VNet integration, ensuring critical data stores have no public exposure.4. Observability & Operational ExcellenceBuild a world-class observability stack using OpenTelemetry (OTel), Azure Monitor, and Azure Managed Grafana.Define Service Level Objectives (SLOs) and create dashboards that visualize saturation, latency, and error rates to proactively identify bottlenecks.Lead the team through root-cause analysis and incident reviews, fostering a blameless culture that prioritizes systemic improvement over individual fault.QualificationsExperience: 10+ years of software engineering experience, including 3+ years in a Lead, Staff, Principal, or architecture-focused role.Tech Stack: Mastery of C# /.NET 8+, Azure (Container Apps, SQL, Service Bus, ADF), and AWS (S3 integration).Heavy Load Expertise: Proven track record of scaling databases (PostgreSQL/SQL Server) to billions of rows. You can explain how you diagnosed and solved locking, bloat, or performance issues at scale.Integration Mastery: Experience with complex backend integrations. Knowledge of EDI standards (X12, NCPDP D.0) or healthcare claims processing is a major plus.Leadership Style: Demonstrated ability to lead remote teams, set best practices (RFCs, Code Review Standards), and mentor senior engineers.Work Authorization: Must be currently authorized to work in the United States without need for future sponsorship.Compensation & BenefitsBenefits: Comprehensive Medical, Dental, and Vision, 100% premium for employees and 25% coverage for dependentsCulture: A focus on technical excellence, where urgency means disciplined execution — and architecture is treated as a competitive advantage.Why ProximityBuild technology that strengthens access to care across the U.S. healthcare system.Shape the architecture of a platform evolving from automation to intelligence.Work alongside a data-focused, mission-driven team redefining how 340B programs operate.Be part of an organization with a clear, unified technical vision and high expectations for engineering excellence.