Top Senior C# Jobs in San Diego, CA

Build and ship full‑stack features for transportation management and other client products. Design and implement APIs and UIs, collaborate with product and design, own delivery, write modular testable code, troubleshoot and iterate quickly, and mentor peers.

Develop and maintain .NET Core trading systems for Linux with service-oriented architecture and multi-threaded processing. Implement async, lock-free structures and distributed systems, write unit and integration tests, optimize SQL queries, design data structures and algorithms, and work with communication protocols (SignalR, gRPC, HTTP). Use PostgreSQL, Docker, and AWS in the deployment stack.

Lead modernization of CI/CD by evolving Azure DevOps pipelines and implementing GitHub Enterprise/Actions. Integrate SAST/DAST, observability, and test automation into pipelines. Design and maintain AWS infrastructure using Terraform and AWS CDK, build reusable IaC patterns, enforce DevSecOps practices, and support AI workload infrastructure and AI-assisted tooling to improve platform reliability and developer productivity.

Design, build, and own end-to-end features for AI-powered finance agents and agent orchestration. Implement integrations with accounting and payment platforms, create dashboards and reporting, ensure security and data integrity, make architectural choices, monitor production, and drive AI-assisted, agentic development workflows.

Support customer and partner relationships by demonstrating radar value, lead integrations with C2/VMS/autonomous platforms, plan and execute installations, tune systems, provide technical support, analyze post-demo data, create training materials, collect feedback, and travel up to 50%.

Design, develop, test, and deploy .NET solutions (APIs and web apps). Build and consume RESTful services, work with SQL and NoSQL databases, use cloud (Azure/AWS) and Docker, apply unit/integration/performance testing, participate in code reviews, define features via spikes, and architect scalable, high-performance systems. Support occasional after-hours and on-call rotation.

The Lead Platform Developer oversees architecture, scalability, and reliability, mentoring engineers and building platform capabilities while ensuring security and compliance in a fast-paced environment.

Design, build, and deploy NICE CXOne contact center solutions and IVR call flows. Integrate backend services and APIs, implement skills-based routing, troubleshoot end-to-end call center applications, coordinate releases across agencies, and act as SME for CXOne deployments and support.

Designs, develops, tests, documents, and maintains software solutions using Pathward's tech stack. Reviews and improves existing systems, remediates security issues, participates in planning and user-story analysis, and mentors other engineers while following development processes and best practices.

Designs, develops, tests, documents, and maintains software solutions. Reviews and improves existing systems, remediates security issues, participates in planning and user story analysis, mentors engineers, and follows development best practices.

Design and implement AI-powered educational software, focusing on generative AI systems, mentor peers, and ensure scalable, secure architecture.

Lead design, development, and maintenance of enterprise-grade React + TypeScript applications. Own front-end performance, responsiveness, and security; integrate with .NET/Azure backends; mentor junior developers; perform code reviews and debugging; modernize legacy apps; collaborate with designers, offshore teams, and stakeholders in Agile ceremonies.

Develop and maintain language frontends for the Joern platform for automated software vulnerability analysis, collaborating with a global team.

Senior individual contributor owning integration architecture and API design across products. Defines API contracts, patterns, tooling, and governance; leads cross-team technical decisions; implements integration services; operates integrations on cloud (AWS preferred); mentors engineers and documents standards, RFCs, ADRs, and runbooks.

Design and own AI-agent-driven test workflows and the automated verification framework. Build test context, select models and tooling, validate AI-generated code and tests, operate test automation across UI/API/mobile/data, ensure security and compliance, mentor teams, and continuously improve agent orchestration and observability.

Design, develop, maintain, and extend healthcare billing and enrollment software. Collaborate with architects and engineers on APIs and architecture, triage production issues, write unit tests, perform impact analysis, research solutions, follow secure coding practices, and mentor junior engineers on an Agile scrum team.

Design, build, and support Dynamics 365 CE/Dataverse solutions including C# plugins, Power Apps, Power Automate flows, and API/Azure-based integrations. Implement DocuSign integrations, collaborate with QA and architecture, and support testing, deployments, and post-release fixes.

Lead technical design and delivery of complex, scalable SaaS features using AI-assisted development. Own specification quality, implement and review AI-generated code, design REST APIs, mentor engineers, and drive cohort-wide standards for architecture, testing, and DevOps practices.

Design and deliver complex, scalable SaaS features end-to-end using AI-assisted development tools. Own specifications, implement and review AI-generated and human code, build REST APIs, maintain UI and backend services, drive AI-assisted workflows, and mentor cohort engineers on tooling, spec writing, and best practices.

Lead delivery for the Payroll development team, contribute as a senior full-stack developer, mentor engineers, partner with Product to translate roadmap into shipped features, champion AI-assisted development tools, ensure quality and reliability of payroll and tax functionality, and support production issue resolution.

Lead frontend development of production web applications using Svelte and other frameworks. Build reusable components, integrate REST/GraphQL APIs, ensure UI/UX quality, accessibility, and performance. Lead a small team, coordinate releases with QA, write tests, follow Git and CI/CD workflows, and collaborate remotely with stakeholders across the US.

The Senior Software Engineer designs and develops software applications, optimizes APIs and databases, collaborates with teams, and ensures code quality through various testing practices.

Lead end-to-end Microsoft Power Platform implementations including discovery, design, build, test, and deployment. Develop low-code solutions (Model-driven and Canvas apps), automate processes with Power Automate, create data visualizations, integrate data, maintain coding standards, produce design documentation, support production issues, and act as a Power Platform SME advising on architecture, security, and CoE governance while participating in Agile ceremonies.

Lead technical delivery for Life Insurance and Annuity clients: design solutions and architectures, produce technical design docs, mentor distributed teams, drive code quality and integrations (APIs), maintain mainframe and .NET codebases (COBOL, C#, DB2/SQL), and leverage AI tools (GitHub Copilot, Claude Code, custom agents) for automation and efficiency.

Design, build, and lead AWS-based contact center solutions (Amazon Connect, Salesforce Service Cloud Voice). Develop integrations, implement CloudFormation/Lambda, apply IaC and CI/CD, perform code reviews, provide technical advisory, documentation and training, and ensure secure, scalable architectures.