Software Development Engineer 5

Years of Experience Required:
10+ years overall; 5+ years in IoT systems architecture mandatory
Education: Bachelor's or Master's in Computer Science, Software Engineering, or related technical field

Primary Function of Position
The contractor in this position will play a key role on the IoMT & Platform Integration team, expanding the MQTT-based IoT architecture across our embedded medical device platforms and AWS cloud infrastructure. This is a 50/50 architecture and hands-on development role — the contractor will leverage the MQTT architecture knowledge while actively contributing production-quality C++ and Python code alongside a team of 4 engineers. Close collaboration with internal engineering, cybersecurity, and product teams is expected throughout the engagement. Design proposals are subject to internal architecture and quality review gates.

Essential Job Duties

Support the expansion of the MQTT-based IoT architecture across our embedded medical device platforms and AWS cloud infrastructure; Produce architecture decision records (ADRs), interface contracts, design specifications, system diagrams;Implement connectivity middleware and communication services in C++ & Python on device side and cloud side;Architect and implement cloud-side integration using AWS microservices (EC2, S3, and related services) to support the migrated protocol layerDesign and implement security hardening: TLS/mTLS, certificate-based device authentication, topic-level authorization, and PKI lifecycle managementDesign for cloud connectivity reliability: offline buffering, reconnect strategies, message deduplication, and guaranteed delivery patterns appropriate for embedded systemsLead and participate in design reviews with the FTE engineering team; incorporate feedback from internal review gatesSupport debugging and root cause analysis of connectivity issues during migration and integration testingProduce thorough documentation and conduct knowledge transfer sessions to ensure continuity at engagement close

Required Skills and Experience
Deep expertise in C++ & Python for system-level software developmentStrong MQTT expertise — broker configuration, QoS levels, topic design, retained messages, MQTT 5.0 featuresSolid understanding of pub/sub and RPC messaging patterns, including how to implement reliable RPC over pub/sub protocolsWorking knowledge of AWS microservices (EC2, S3, and adjacent services); ability to design cloud-side components supporting device connectivityStrong grasp of network security fundamentals: TLS/mTLS, PKI, certificate management, and authorization patterns for IoT devicesProven ability to produce high-quality architecture documentation — ADRs, design specs, interface definitionsExcellent communication skills; able to lead design discussions and drive alignment across technical and non-technical stakeholdersQuality-first engineering mindset: writes clean, well-documented, maintainable code that teammates can own after the engagement endsAble to work independently and manage technical ambiguity with minimal guidance

Required Education and Training
Bachelor's or Master's degree in Computer Science, Software Engineering, or a related technical field10+ years of software engineering experience, with 5+ years focused on IoT systems architecture
Working Conditions

Onsite, 5 days per week at Sunnyvale, CA office
Able to work with computers and equipment over extended periods

Preferred Skills and Experience
Experience in regulated or safety-critical industries (medical, aerospace, industrial) — valued but not requiredBackground in asynchronous, event-driven, and multi-threaded system designFamiliarity with FMEA or software risk analysis processesFamiliarity with cloud observability and operational monitoring tooling (e.g., AWS CloudWatch)Strong industry experience in architecture and development of scalable, production-quality systems