Top C# Jobs in San Diego, CA

The Senior Software Engineer will lead projects for the Forms platform, designing and building features across web, mobile, and backend systems while mentoring other engineers and improving platform scalability and reliability.

Lead architecture and hands-on development of the end-to-end video pipeline (live ingest, transcoding, storage, playback, and developer SDKs). Mentor engineers, collaborate across mobile/web/ML/platform teams, own monitoring and on-call support, and help scale video streaming and VoD capabilities for millions of streams and clips.

Lead development of core client systems and engine-level infrastructure in Unity/C#. Diagnose and fix cross-cutting performance issues, upgrade third-party SDKs, evolve build tooling, produce design docs, scope multi-week infrastructure initiatives, mentor engineers, and drive profiling, optimization, and architecture changes to enable future features.

Lead design and build of scalable AWS cloud-based backend services and APIs powering web and mobile customer experiences. Own end-to-end feature delivery, improve grading and authentication workflows for scale and reliability, leverage AI tools to accelerate development, and provide technical leadership and mentorship across teams.

Manage and grow the Video Enablement engineering team, own core video pipeline (ingest, transcode, storage, playback), enable third-party device integrations, collaborate on video roadmap, ensure scalable resilient AWS infrastructure, mentor engineers, contribute technically when needed, and support production incidents and cross-team enablement.

Lead software architecture, design, development, testing, and deployment of real-time C4ISR and simulation systems. Drive customer engagement to gather requirements, guide development, mentor team members, and support demonstrations and live flight exercises. Participate across the full software lifecycle and support integration of distributed, full-stack capabilities.

As a Lead Software Engineer, you'll design and develop GenAI platforms, integrate LLMs, mentor engineers, and solve technical challenges for scalable solutions.

Design, build, and operate cloud-native, enterprise-grade SaaS services on Azure. Lead architecture and design, develop APIs and UIs, apply AI-enabled engineering tools, ensure observability, support production incidents, and drive reliability, performance, and CI/CD improvements across teams.

Provide advanced technical support for large MongoDB customers across the full MongoDB ecosystem (server, drivers, Atlas, Cloud Manager). Troubleshoot performance, architecture, recovery, security and storage issues end-to-end, develop support tools, mentor new hires, and liaise with product and engineering teams. Work EST shifts with a weekend shift expectation after ramp and participate in occasional off-hours coverage or regional events.

Lead architecture and delivery of scalable on-premises and hybrid datacenter IaaS systems. Decompose requirements, develop infrastructure blueprints, lead design reviews, provide technical leadership and knowledge transfer, implement automation and documentation, and ensure consistent implementation across programs while supporting program security and access requirements.

Twelve-week virtual fellowship teaching Palantir Foundry and AIP through live sessions and projects. Expect 5–10 hours/week, hands-on training, mentorship, certification opportunity, and potential interviews for employment. Program is unpaid.

Lead SRE efforts for DFIN SaaS: ensure availability, performance, scalability, and automation. Implement monitoring, CI/CD, IaC, container orchestration, AI-enhanced observability, incident response, RCA, and runbook automation while collaborating across engineering teams.

Design, build, and maintain cloud-native backend applications using C#/.NET on AWS. Leverage Claude for AI-assisted coding, participate in design and code reviews, improve performance and reliability, and mentor engineers while collaborating across product and architecture teams.

Design, architect, develop, deploy, and operate a DevSecOps software factory for aerospace programs. Implement and automate CI/CD pipelines, continuous build/integration/test/deployment/cyber, coordinate builds and delivery schedules, work in Agile teams with systems, embedded software, and test automation, and support cyber remediation and metrics collection.

As a Senior Software Engineer, you'll develop and build tools for creative projects while leading feature development and collaborating with teammates.

Design, develop, and maintain Windows-based machine control and automation software (C/C++, C#) for electro-mechanical test handlers. Own architecture, hardware integration, multithreaded/event-driven systems, field troubleshooting, reliability improvements, verification strategies, and mentorship across cross-functional teams.

Design, architect, and implement full-stack web applications and middleware solutions. Lead API management architecture and develop backend services using C# and SQL Server. Provide expert-level software engineering and middleware design across the application stack.

Senior .NET developer to deploy ASP.NET applications to Amazon Web Services, build real-time vessel tracking and reporting views, and work with C#, SQL Server, MVC, Windows Communication/Services, and firmware in an Agile environment. 6-month contract-to-hire based in San Diego.

Early-career software engineer contributing to embedded, networking, and mission-critical systems across kernel-to-UI stacks. Participate in SDLC, code reviews, testing, security requirement implementation, troubleshooting, and agile team activities to deliver secure software for U.S. defense platforms.

The role involves maintaining lab automation equipment, supporting workflow in protein therapeutic discovery, and collaborating on automation-driven research workflows.

Design, build, and operate scalable AWS-based backend services and APIs for the Collectors Vault. Own architecture and delivery, improve performance and reliability, mentor engineers, and leverage modern AI tools to accelerate development and engineering velocity.

Lead backend and full-stack work on the Payments team, building multi-gateway integrations (Stripe, PayPal), payment APIs, and customer payment UIs. Ensure secure, compliant (PCI-DSS) payment flows, reliability, observability, and scalability across AWS/Kubernetes microservices. Partner cross-functionally to design architecture, implement settlement/reconciliation, and maintain high availability.

The Principal Software Engineer will design and oversee architecture for software systems, collaborate with teams, and ensure robust, secure solutions for debt solutions products.

Develop scientific software for AI-native drug discovery, building data pipelines, APIs, and lab automation integrations while collaborating with scientists.

Design, implement, and optimize gameplay mechanics and systems. Collaborate with designers, artists, and developers to troubleshoot and refine code, optimize performance across platforms, and maintain clean modular code while staying current with game technologies.