Top C# Jobs in San Diego, CA

Lead design, development, and maintenance of scalable .NET web and Windows applications. Build RESTful APIs, integrate front-end frameworks, collaborate with cross-functional teams, drive architectural decisions, perform code reviews and testing, and support deployments and backlog reduction for the eApp portfolio.

The Sr. Software Engineer designs, implements, and maintains scalable cloud services, contributes to team processes, and acts as a subject matter expert while leading projects and mentoring others.

As a Software Engineer, you will design, develop, and deliver high-quality software, contribute to code reviews, monitor application performance, and ensure maintainability and consistency across products.

Design, build, and maintain scalable test automation frameworks and tooling (Playwright, C#, JS/TS). Integrate automated tests into CI/CD, develop end-to-end, integration, and performance tests, apply AI techniques for test generation and defect detection, troubleshoot system issues, mentor QA teams, and drive automation and quality engineering best practices.

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.

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

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.

Senior Software Engineer responsible for developing and maintaining web applications and microservices (React, Golang). Mentor team members, lead code reviews, influence technical decisions, improve CI/CD and testing strategies (unit, E2E, performance), collaborate across teams on integrations, and promote engineering best practices and documentation.

The Quantitative Developer will assist with client onboarding, support, implement and maintain new functionality for portfolio compliance, and improve team documentation.

Design, build, and scale authentication, authorization, and experimentation systems for Upstart's lending products. Implement OAuth/OIDC/SAML-based flows, secure APIs with containerized deployments, partner with security and product teams to improve IAM, mentor engineers, participate in architecture, and drive platform experimentation and lifecycle improvements.

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

Lead the architectural design and development of a new consumer credit product, focusing on backend systems, distributed services, and integrating AI tools. Mentor team members and influence product direction through engineering insights.

Design, develop, and field high-performance Ground Control Station and C2 software using C++/Qt/QML and QGroundControl. Lead architecture and technical direction, mentor engineers, define APIs/ICDs, debug integration/latency issues, support field tests, implement post-mission debrief tools, and ensure interoperability with C2 standards.

Design, implement, and improve significant features in HCSS products. Analyze product architecture and databases for ROI-driven improvements. Lead code reviews, mentor junior developers, collaborate to enhance infrastructure, reliability, and CI/CD practices.

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.

Technical Services Engineers at MongoDB solve complex database problems for customers, requiring deep technical skills and customer service expertise. They work on architecture, performance, and support tools, engage with clients on technical queries, and contribute to projects within the MongoDB ecosystem. The role demands a mix of systems and storage engineering experience, coding skills, and a collaborative spirit.

Lead and architect enterprise digital banking applications, manage a portfolio of teams, design secure performant solutions, improve development practices, integrate services/APIs, and collaborate with stakeholders to deliver the product roadmap.

Design, develop and execute automated tests and integration/acceptance procedures for embedded software. Analyze requirements, debug issues, produce technical documentation, submit problem reports, and collaborate with systems, hardware, and test teams. Work full-time on-site supporting software lifecycle activities and test automation; travel up to 25%. Top Secret clearance and SAP access required.

The K2 Architect will design, implement, and maintain business process workflows using K2 technology, interact with clients, and prepare documentation.

Seeking a .NET Developer with over 5 years of web development experience. Responsibilities include analyzing system requirements, assisting with UAT, and participating in meetings. Must be familiar with various technologies and work collaboratively with teams.

Develop Salesforce integrations and customized CRM solutions, improve business processes, and document code while working in a collaborative team environment.

The Senior Software Engineer will develop scalable applications, collaborating on technical designs and maintaining high standards throughout the software lifecycle.

Seeking a Senior Embedded Software Engineer with expertise in RTOS and Embedded Linux, focusing on ETH PHY/MAC layers and networking. Experience in areas like SatCom, AI, and automotive is desired.

The ServiceNow Developer IV implements IT solutions, develops software configurations, and collaborates with teams to optimize systems and meet business needs.