Top Senior C# Jobs in San Diego, CA

Own the full software development lifecycle, including design, implementation, automated testing, and delivery. Build extensible ServiceNow platform experiences and reusable component systems, collaborate with product owners, and enhance existing products. Apply advanced software architecture, algorithms, data structures, object-oriented design, performance optimization, and relational database expertise. Serve as a technical owner or functional lead, manage cross-team technical risks, mentor colleagues, and promote knowledge sharing.

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.

Lead design and implementation of modernized insurance underwriting and policy administration solutions. Drive cloud transformation, data-driven and secure architectures, improve risk selection and claims resolution, enhance customer experience through automation, mentor technical teams, manage client relationships, and oversee project lifecycle, budgets, and delivery quality.

Designs, develops, and executes comprehensive testing for C# thick-client, web, cloud, bioinformatics, and hardware-integrated software. Responsibilities include functional, regression, integration, and performance testing; defect tracking in Azure DevOps; test automation; pull request reviews; cross-functional collaboration; and improving QA processes. The role also ensures software quality standards and industry compliance.

Design, build, test, deploy, and support scalable data-intensive applications for real estate analytics. Own software throughout its lifecycle, collaborate on technical designs, uphold engineering best practices, and contribute to architecture and continuous improvement. The role requires modern server-side and front-end development, relational database expertise, source control, testing, operations, and AI-assisted development workflows.

Builds, integrates, and delivers secure software capabilities for regulated government and DoD environments. Responsibilities include software architecture and development, Agile delivery, Git workflows, automated testing, Kubernetes or cloud deployment, DevSecOps security gates, resilient DDIL and afloat/ashore PaaS architectures, and secure Cross-Domain Solutions integration.

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.

Design, develop, and modernize desktop and web software tools using .NET, databases, and front-end frameworks. Collaborate with cross-functional teams, create technical designs and project plans, implement secure performant solutions, and mentor team members while supporting digital transformation and legacy tool upgrades.

Develop and maintain cross-platform build, packaging, and release pipelines for AAA games across consoles and mobile platforms. Bring engines up on new hardware, manage SDK upgrades, resolve low-level crashes and memory issues, and evolve internal tools for profiling, metrics, and data packaging. Lead infrastructure modernization, maintain build automation, and coordinate branch integration across engineering, QA, and production teams.

Designs, develops, tests, documents, and integrates algorithms and software for intraoperative neuromonitoring medical devices. Responsibilities include machine learning model development using clinical data, software architecture, application development, root-cause analysis, cross-functional product collaboration, and full lifecycle ownership of algorithm projects. The role requires compliance with FDA regulations, ISO 13485, and related medical-device standards, with travel up to 10%.

Develops, maintains, tests, and supports software and system components within Agile project teams. Responsibilities include requirements analysis, version control, build and CI/CD processes, automated testing, acceptance testing, technical documentation, infrastructure administration, architecture improvements, and systems modeling. The role requires DevSecOps experience in regulated government or DoD environments and development of resilient software architectures for DDIL and afloat/ashore PaaS environments.

Build and modernize large-scale software factories across multiple programs. Integrate and automate continuous build, integration, testing, and deployment pipelines using DevOps tools, containers, orchestration, and modern software development practices. Collaborate with software teams, chief engineers, and program stakeholders in an onsite, fast-paced environment. The role requires obtaining and maintaining Top Secret and Special Access Program access.

Leads end-to-end development of software that validates and accepts hardware racks into Microsoft datacenters. Designs reliable, observable, and scalable workflows; translates hardware and operational requirements into platform capabilities; diagnoses production issues; improves automation and performance; and collaborates with software, hardware, networking, manufacturing, and datacenter teams. The role includes architectural design, implementation, testing, rollout, monitoring, documentation, and mentoring.

Lead technical ownership of InfiniBand and GPU interconnect fabric operations for hyperscale AI supercomputers. Drive incident response, deep multi-layer debugging across hardware/firmware/drivers/OS, and define failure models, playbooks, telemetry, and automation to improve reliability, observability, and scalability of GPU clusters and platform SLAs.

Develop and evolve Azure capacity infrastructure, platform capabilities, and service stacks at scale. Provide technical leadership in requirements, architecture, design, coding, release planning, and operational reliability. Mentor engineers, manage cross-product dependencies, serve as a designated responsible individual, participate in on-call support, and improve system availability, observability, performance, and efficiency.

Lead architecture and design for Azure capacity infrastructure, leveraging AI/Copilot to evolve platforms and tools. Guide virtual teams, define requirements and design documents, drive releases, optimize and refactor code, monitor systems as DRI, and ensure products meet scalability, performance, security, and reliability goals.

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.

Volunteer senior developer to design, build, and maintain a cross-platform medical scheduling app (web, iOS, Android). Participate across the full development lifecycle: design, coding, testing, CI, deployments, code reviews, production support, incident management, and platform architecture. Attend weekly standups and commit at least four hours per week.

Design and develop scalable C++ software for endpoint state and control across Windows, macOS, and potentially Linux. Build reliable, multi-process systems that enforce endpoint behavior, manage local state, support IPC, and operate across millions of devices. Responsibilities include implementing features, improving platform performance, writing design documents, defining architecture and IPC contracts, and making technical decisions in an evolving, sparsely documented environment.

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

Design, develop, deploy, and modernize a mission-critical loan management platform. Responsibilities include application architecture, full-stack software development, legacy modernization, performance and reliability improvements, production troubleshooting, code reviews, monitoring, testing, CI/CD automation, and technical strategy. The engineer partners with Product, QA, DevOps, and Engineering teams, contributes to planning and design, mentors colleagues, and promotes engineering excellence.

Build scalable backend-heavy services and applications using C# and .NET, while contributing to Angular and TypeScript UI development. Design and develop REST APIs and microservices, work with relational databases, implement automated testing and CI/CD, and ensure system security, scalability, and performance. Preferred work includes event-driven architectures, messaging systems, NoSQL databases, caching, search technologies, and mentoring engineers or leading technical initiatives.

Design, build, and maintain production-grade .NET web applications and APIs on Azure. Own full-stack delivery from data models and SQL to front-end components, CI/CD, testing, and architecture. Collaborate with product and delivery teams, participate in code reviews, and ensure secure, observable, well-tested services.

Develop and maintain a cross-platform C++ endpoint agent that detects, installs, validates, and rolls back operating system and third-party software patches. Responsibilities include code review, mentoring engineers, improving development processes, collaborating across teams, and translating product needs into technical designs. The role requires system-level development across Windows, macOS, and Linux using modern C++, gRPC, Protocol Buffers, SQLite, and CMake.

Design, implement, debug, and ship features for Azure Storage front end at cloud scale. Drive design, dependency identification, automation, reliability, observability, and on-call incident response while collaborating with stakeholders and mentoring engineers.