Top Senior C# Jobs in San Diego, CA

Design, maintain, and own high-throughput data ingestion and processing pipelines. Lead architecture and reliability initiatives, collaborate with Product Management, deliver scalable backend services (C#), and support observability, deployments, and operational support on cloud-native platforms.

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.

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.

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.

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

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.

The Principal Software Engineer will design and optimize backend applications/services, improve payment integration, and oversee code quality within AWS.

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.

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

Senior .NET developer to deploy ASP.NET applications to Amazon Web Services, build real-time vessel tracking and reporting views, and work with C#, SQL Server, MVC, Windows Communication/Services, and firmware in an Agile environment. 6-month contract-to-hire based in San Diego.

The role involves maintaining lab automation equipment, supporting workflow in protein therapeutic discovery, and collaborating on automation-driven research workflows.

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.

Design and develop software for automated laboratory workflows, build data pipelines, implement machine learning models, and integrate various systems to enhance biotherapeutics discovery.

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.

Design, develop, and deliver enterprise automation and AI agent solutions using Microsoft Power Platform. Translate business requirements into scalable Power Automate and Power Apps workflows, implement exception handling, monitoring, and resiliency, and maintain production automations. Use Azure DevOps/Git for CI/CD, collaborate with stakeholders, and drive automation governance and process improvements.

Design, build, integrate, upgrade, and support enterprise-scale Oracle CPQ and Java-based solutions. Partner with stakeholders, implement integrations and APIs, perform production support, execute upgrades/patches, ensure technical governance, and contribute across the software development lifecycle.

The Sr. Vision Software Engineer will design, test, and integrate machine vision solutions, develop computer vision algorithms, and troubleshoot production issues while collaborating with engineering teams.

Designs and implements enterprise Java (JEE) solutions and microservices in an Agile environment. Collaborates with systems, cloud, DevSecOps, and test teams across the SDLC to prototype, build, test, and release GUI and backend services. Requires Top Secret clearance and SAP/PAR access, on-site work in San Diego or El Segundo, and periodic travel.

Design, develop, deploy, and maintain web applications and utilities supporting Pricing & Estimating and Contract Execution. Engage stakeholders to gather requirements, participate on Agile development teams, build/test/document features, and support sector-wide applications. Role may be Level 2 or Level 3 depending on experience.

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.

Drive validation, automation, and performance engineering for distributed services. Build end-to-end and performance test frameworks, integrate validation into CI/CD, model production traffic, define SLAs/SLOs and capacity, reduce flaky tests, and improve reliability and observability using telemetry and incident learnings.

The DevOps Engineer will enhance the DevOps culture within agile teams by implementing CI/CD, coaching, and developing quality products across various roles.