Top Senior C# Jobs in San Diego, CA

Leads software quality engineering across digital banking products by designing scalable automated tests, expanding frameworks, integrating testing into CI/CD, analyzing defects, and closing testing gaps. Partners with engineering and product teams on quality strategy, reviews automation code, mentors SDETs and QA professionals, leads testing teams, supports bug triage, and establishes consistent testing standards across multiple product areas.

Own and improve Dropbox’s Windows endpoint platform, including provisioning, application delivery, patching, compliance, security configuration, troubleshooting, fleet health, and automation. Build code-managed endpoint operations using Intune, FleetDM, osquery, infrastructure-as-code, and GitOps practices. Lead cross-functional improvements, establish reliable deployment workflows, mentor engineers, review code and designs, and document reusable operational practices.

Designs and evolves AWS infrastructure as code using CDK, develops backend software primarily in TypeScript, and applies secure engineering practices for regulated environments. The role contributes to architecture, code reviews, CI/CD pipelines, production support, observability, and on-call operations. It collaborates cross-functionally, builds scalable and reusable systems, supports SOC 2 compliance, and uses AI coding assistants to improve development, testing, and documentation.

Develop and maintain C#/.NET software for electric and gas distribution engineering tools. Implement features, fixes, integrations, tests, and CI/CD automation while configuring enterprise systems for customer needs. Collaborate in Scrum, participate in reviews, reduce technical debt, document processes, and mentor teammates. The role may involve GIS or Enterprise Asset Management integrations and requires strong software development experience in utility or energy infrastructure environments.

Leads architecture and hands-on development of scalable backend systems and APIs supporting real-time applications. Owns the engineering lifecycle, writes high-performance code, establishes testing and reliability practices, resolves production issues, guides technical roadmaps, collaborates cross-functionally, and mentors engineers. The role requires expertise in object-oriented backend development, distributed cloud systems, automated testing, system monitoring, and technical leadership.

Designs, builds, and improves test automation frameworks and production-quality test code across unit, integration, end-to-end, performance, and security testing. Partners with cross-functional teams to embed quality throughout the software development lifecycle, validates APIs and databases, supports CI/CD automation, and works with distributed systems and modern web architectures. The role also involves code and design reviews, debugging, documentation, communication, and mentoring junior engineers.

Design, build, and maintain scalable C#/.NET production applications and backend services on AWS. Use Claude for AI-assisted coding, refactoring, debugging, and analysis. Collaborate on architecture, system design, code reviews, performance, scalability, and reliability. Participate in technical decision-making, mentor engineers, and promote engineering best practices across cloud-native systems.

Develop scalable test automation frameworks, QA tools, and intelligent testing systems using Playwright, C#, and JavaScript/TypeScript. Integrate automated testing into CI/CD pipelines, build end-to-end, integration, and performance solutions, and apply AI techniques to improve test generation and defect detection. Partner with engineering and QA teams, troubleshoot reliability issues, contribute to test strategy, and mentor colleagues on automation and modern testing practices.

Designs and leads large-scale distributed systems and microservices architectures using cloud-native platforms. Responsibilities include service decomposition, domain-driven design, distributed data management, API and event-driven architecture, resilience, observability, security, and production operations. The role leads architecture initiatives across multiple teams, evaluates platform and service mesh technologies, supports high-traffic systems, and guides long-term maintainability, cloud optimization, and platform engineering efforts.

Design, develop, and modernize a proprietary loan management platform. Build scalable full-stack solutions, improve architecture, reliability, monitoring, testing, and deployment practices, and resolve complex technical issues. Partner with Product, QA, DevOps, and Engineering teams while contributing to technical strategy, code reviews, development standards, mentoring, and continuous improvement across production and development environments.

Leads systems architecture, lifecycle engineering, sustainment, modernization, integration, testing, and troubleshooting for U.S. Navy tactical networks. Analyzes failures, develops Linux-based software solutions, manages configuration and engineering documentation, supports Agile DevOps delivery, and coordinates with customers, vendors, and engineering teams. The role includes technical reviews, presentations, occasional off-hours support, onsite casualty response, and up to 10% CONUS/OCONUS travel. Requires active Secret clearance, U.S. citizenship, and eligibility for Top Secret clearance.

Develops enterprise Java software for payloads and tasking applications in an Agile environment. Responsibilities include object-oriented design, GUI development, microservices, SOA, web services, XML technologies, software integration, testing, and full SDLC participation. The role collaborates with systems engineering, cloud, DevSecOps, test automation, and systems test teams. It requires maintaining a Top Secret clearance and obtaining Special Program Access, with on-site work in San Diego and approximately 10% travel.

Develop, maintain, and execute automated tests for safety-critical embedded and real-time software. Analyze software requirements, perform integration and acceptance testing, diagnose defects, and support qualification activities. Collaborate with systems, hardware, software, and integration engineers across development, laboratory, and operational environments. Create test procedures, technical documentation, integration plans, and software scripts while working within Agile and full SDLC processes.

Develop and maintain enterprise digital experiences across Sitecore XP, XM Cloud, and Content Hub. Responsibilities include backend C#/.NET development, frontend implementation, content modeling, integrations, headless architectures, CI/CD deployments, platform upgrades, legacy migrations, troubleshooting, and performance tuning. The role also requires collaboration with editors, marketers, and stakeholders across complex, potentially multi-brand Sitecore environments.

Volunteer Principal Full Stack Engineer to lead and contribute across frontend and backend (React/React Native, Node.js, MongoDB). Own feature development, mentor engineers, collaborate with product/design, ship scalable code, and support CI processes. Must commit 4+ hours weekly and attend a weekly standup; first task includes launching a fundraising campaign.

Develop and document enterprise-grade SaaS platform functionality while improving quality and performance. Responsibilities include full-stack development, functional and unit testing, defect triage, code reviews, API and process documentation, operational support in regulated environments, and collaboration within Agile and DevOps teams. The role requires expertise in C#, ASP.NET Core, T-SQL, Entity Framework Core, web technologies, software design, debugging, distributed architectures, and high-performance APIs.

Lead technical strategy and architecture for Azure Storage geo-replication, data protection, failover orchestration, and business continuity. Drive cross-team delivery, operational excellence, telemetry, automation, AI-assisted operations, and represent the team in executive and customer engagements.

Designs and develops software to automate onboarding, validation, management, tracking, and lifecycle operations for new hardware deployed in Microsoft datacenters. Responsibilities include requirements analysis, system design, coding, debugging, optimization, reliability engineering, monitoring, on-call support, and incident response. The role collaborates with Azure teams and stakeholders while improving scalability, security, availability, observability, and performance across cloud and distributed systems.

Develop compiler and high-performance computing solutions that translate .NET and Java bytecode into optimized CUDA and ROCm code for CPUs and GPUs. Analyze customer algorithms, design parallel implementations, extend compilation infrastructure, build reusable libraries, and optimize throughput and latency. Apply expertise in GPU programming, compiler architecture, mathematics, and software engineering to deliver performance matching or exceeding hand-tuned binaries.

Lead customer-facing HPC deployments and serve as the escalation point for complex hardware, operating system, application, and compiler issues. Deploy and debug GPU-accelerated Kubernetes clusters across on-premises and cloud environments, using Python, C#/.NET, CUDA, and ROCm. Diagnose issues involving NVIDIA and AMD GPUs, high-speed interconnects, PCIe topology, and driver stacks. Create technical documentation, reproduce customer failures, and collaborate with engineering and R&D on bug reports and product improvements.

Design, develop, customize and maintain enterprise Sitecore solutions (versions 9/10, SXA, JSS, XM Cloud). Produce technical specs, implement components, test and debug in test and production, support teammates, perform demos to customers, and escalate/resolve issues.

Design, develop, test, and maintain backend services and APIs for secure fintech and crypto products. Collaborate with engineering and product teams on architecture, code reviews, system design, and deployment using Azure. Optimize backend performance and scalability, resolve defects, follow DevOps and CI/CD practices, and build reliable systems supporting payments, transfers, and other financial activity.

Senior .NET Software Engineer responsible for end-to-end software development using Microsoft technologies. Requires extensive experience in SDLC, design principles, technical documentation, web application development with .NET, Agile/SCRUM, Entity Framework, database design, and version control. Familiarity with project tools JIRA, TEMPO, Bitbucket, and Confluence preferred.

Senior .NET Web App Developer responsible for designing and building .NET web applications, implementing Oracle PL/SQL solutions, using Entity Framework and Blazor, applying design principles, producing technical documentation, performing performance tuning, and collaborating in Scrum/Agile teams with Bitbucket, JIRA, Tempo, and Confluence.

Develop and maintain web-based applications using .NET/C#, JavaScript, HTML/CSS, SQL and Oracle/SQL Server. Perform root cause analysis, collaborate with teams for requirements, follow Agile SDLC, present change demonstrations, and use Azure DevOps/Jira for lifecycle management. Implement and maintain Blazor components.