Top C# Jobs in San Diego, CA

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.

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.

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

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.

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.

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 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.

Own reliability, automation, and DevOps for Coinbase's corporate IAM platform: on-call/incident response, CI/CD and IaC pipelines, identity lifecycle tooling, observability and disaster recovery, documentation, and cross-team IAM advisement to ensure secure, scalable access for a global workforce.

Design, develop, test, document and debug software and systems; collaborate with multidisciplinary teams and hardware engineers; develop compilers/utility programs, ensure software standards, and provide solutions to technical problems. Work is on-site and may require travel up to 25%.

Develop, profile, and optimize high-performance C#/.NET software and desktop UIs (WPF/MVVM, Blazor). Apply CS fundamentals, implement CRUD/gRPC services, operate in CI/CD and version-controlled environments, follow secure coding/DoD standards, produce technical documentation, reverse-engineer legacy code, and support system modeling/simulation for defense programs on-site.

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.

Develop, calibrate, and defend steady-state and transient gas turbine performance models; analyze test and field data; build internal software, automation, and AI-accelerated tools to support design, testing, and product support across teams.

Design, develop, deploy, and maintain Microsoft Power Platform solutions (Power Apps, Power Automate, Power BI, Dataverse) for a Navy client. Translate business needs into system designs, build Model‑Driven and Canvas apps, create integrations and customizations, extend with Dataverse/Client APIs, provide support and documentation, and collaborate with stakeholders in an Agile environment.

Lead design, build, and operate a large-scale DevSecOps software factory: define and implement CI/CD/Cyber pipelines, architect deployments, collaborate with multidisciplinary teams, and support cloud, VM, and network configurations for aerospace programs.

Lead a 10-20 person software test team through the full SDLC in an Agile environment. Manage test automation, budgets, schedules, cross-functional integration with systems engineering and DevSecOps, and provide functional people management. Ensure product quality, reporting, and compliance while supporting contract mission objectives. On-site in San Diego with DoD Secret clearance required.

Lead design and delivery of scalable on‑premises and hybrid IaaS datacenter systems. Decompose customer requirements, build infrastructure blueprints, automate deployments, produce technical documentation, mentor cloud/infrastructure engineers, and ensure consistent implementation and acceptance criteria across programs. Requires Top Secret clearance and SAP access.

Lead and mentor software engineering teams to execute programs using Agile and SDLC practices. Responsibilities include technical planning, system integration, verification/validation, proposal support, staffing and resource planning, process/tool improvements, procurement of equipment, documentation, and supporting day-to-day software center activities. Requires active DoD Secret clearance and ability to obtain SAP/PAR.

Design, architect, develop, deploy, and operate a large-scale DevSecOps software factory for aerospace programs. Implement and run the full DevSecOps lifecycle (CI/CD, automated testing, cyber, monitoring) and work with multidisciplinary teams in an Agile environment.

Design, architect, develop, deploy, and operate a DevSecOps software factory for aerospace programs. Stand up large-scale software factory and implement CI/CD, continuous test, continuous cyber, and continuous deployment pipelines. Collaborate with systems, embedded software, test automation, and DevSecOps teams in an Agile environment.

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.

Design, implement, profile, and optimize high-performance C#/.NET software and WPF desktop applications. Build reusable UI libraries for WPF and Blazor, implement CRUD/DTO and gRPC patterns, operate in CI/CD pipelines, follow secure coding and DoD/NIST compliance, reverse-engineer codebases, and produce technical documentation while supporting modeling and simulation for mission planning and systems performance analysis.

Support software engineering lifecycle with emphasis on automated testing, requirements verification, hardware/software integration, lab management, and test automation development in an Agile environment for mission systems.