Top Senior C# Jobs in Houston, TX

The Senior IT QA Engineer owns quality strategy and outcomes across complex technology initiatives. Responsibilities include designing automated testing solutions, integrating quality verification into CI/CD pipelines, analyzing quality and production data, developing dashboards, managing risk, leading root-cause analysis, and influencing product, engineering, architecture, security, operations, and business stakeholders. The role requires technical contributions across web, mobile, API, data, cloud, and distributed systems, plus mentoring engineers and advancing quality engineering practices.

Design, develop, troubleshoot, and support secure, high-volume software applications in an Agile environment. Provide technical leadership across the software development lifecycle, lead code and design reviews, establish automated testing, monitor production systems, and improve quality practices. Collaborate with architects, product partners, customers, and engineers while mentoring team members. Build and maintain AI-enabled components responsibly, applying security, privacy, governance, observability, and compliance standards.

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.

Design, develop, and maintain scalable cloud-based microservices and foundational platform capabilities for authentication, authorization, onboarding, RBAC, reporting, auditing, notifications, and APIs. Improve reliability through observability, monitoring, alerting, infrastructure automation, and operational reviews. Provide technical leadership, collaborate across teams, guide architecture and best practices, reduce technical debt, and improve engineering efficiency.

Develop and document enterprise-grade SaaS platform functionality while improving quality and performance. Responsibilities include full-stack development, functional and unit testing, defect triage, code reviews, API and process documentation, operational support in regulated environments, and collaboration within Agile and DevOps teams. The role requires expertise in C#, ASP.NET Core, T-SQL, Entity Framework Core, web technologies, software design, debugging, distributed architectures, and high-performance APIs.

Designs, builds, and maintains full-stack web applications, ERP and CRM integrations, REST APIs, and customer-facing platforms. Develops React interfaces and Python Flask or .NET backend services, manages Microsoft SQL Server databases, integrates Power BI reporting, and maintains CI/CD pipelines. The role also addresses production issues, system performance, security, reliability, code reviews, and architectural planning.

Develop compiler and high-performance computing solutions that translate .NET and Java bytecode into optimized CUDA and ROCm code for CPUs and GPUs. Analyze customer algorithms, design parallel implementations, extend compilation infrastructure, build reusable libraries, and optimize throughput and latency. Apply expertise in GPU programming, compiler architecture, mathematics, and software engineering to deliver performance matching or exceeding hand-tuned binaries.

Lead customer-facing HPC deployments and serve as the escalation point for complex hardware, operating system, application, and compiler issues. Deploy and debug GPU-accelerated Kubernetes clusters across on-premises and cloud environments, using Python, C#/.NET, CUDA, and ROCm. Diagnose issues involving NVIDIA and AMD GPUs, high-speed interconnects, PCIe topology, and driver stacks. Create technical documentation, reproduce customer failures, and collaborate with engineering and R&D on bug reports and product improvements.

Design, develop, customize and maintain enterprise Sitecore solutions (versions 9/10, SXA, JSS, XM Cloud). Produce technical specs, implement components, test and debug in test and production, support teammates, perform demos to customers, and escalate/resolve issues.

Develop and maintain full-stack web applications across frontend and backend systems. Responsibilities include feature delivery, code reviews, debugging, performance optimization, scalable architecture, API and database integration, documentation, and collaboration with product and QA teams. The role uses modern frontend frameworks, backend technologies, cloud services, and relational databases while supporting industrial and energy-sector applications.

Design, develop, test, and maintain backend services and APIs for secure fintech and crypto products. Collaborate with engineering and product teams on architecture, code reviews, system design, and deployment using Azure. Optimize backend performance and scalability, resolve defects, follow DevOps and CI/CD practices, and build reliable systems supporting payments, transfers, and other financial activity.

Senior .NET Software Engineer responsible for end-to-end software development using Microsoft technologies. Requires extensive experience in SDLC, design principles, technical documentation, web application development with .NET, Agile/SCRUM, Entity Framework, database design, and version control. Familiarity with project tools JIRA, TEMPO, Bitbucket, and Confluence preferred.

Senior .NET Web App Developer responsible for designing and building .NET web applications, implementing Oracle PL/SQL solutions, using Entity Framework and Blazor, applying design principles, producing technical documentation, performing performance tuning, and collaborating in Scrum/Agile teams with Bitbucket, JIRA, Tempo, and Confluence.

Develop and maintain web-based applications using .NET/C#, JavaScript, HTML/CSS, SQL and Oracle/SQL Server. Perform root cause analysis, collaborate with teams for requirements, follow Agile SDLC, present change demonstrations, and use Azure DevOps/Jira for lifecycle management. Implement and maintain Blazor components.

Develops and supports enterprise EDI integrations by creating and troubleshooting maps, configuring IBM Sterling B2B Integrator, onboarding trading partners, monitoring transactions, coordinating testing and deployments, and resolving production issues. The role integrates EDI with Infor M3 ERP and other systems using APIs, web services, databases, and secure communication protocols. It also documents technical processes, performs root cause analysis, and supports production .NET, IIS, SQL Server, and integration environments.

Designs, develops, and integrates business applications across Dynamics 365, Power Platform, Azure, and custom Microsoft-stack solutions. Responsibilities include solution architecture, application customization, APIs and event-driven integrations, platform modernization, ALM, CI/CD, deployment pipelines, and production support. The role also establishes engineering standards, evaluates technologies, collaborates with technical and business teams, and mentors junior staff.

Leads the design, development, architecture, and maintenance of scalable software systems. Provides technical leadership, conducts code reviews, ensures development best practices, and mentors junior engineers. Collaborates with technical and non-technical stakeholders to deliver reliable solutions supporting clinical decision-making and patient outcomes.

Performs and verifies nuclear radiological engineering analyses, including shielding, fluence, criticality, reactivity control, control rod design, spent fuel pool criticality, and transport package assessments. Supports regulatory compliance, documents technical results, coordinates with customers and project teams, improves processes, and mentors early-career engineers. The role requires extensive nuclear power plant experience, MCNP expertise, and knowledge of radiation transport methods and reactor licensing.

Own partner integrations from technical discovery through production launch and stabilization. Translate business and technical needs into integration designs, requirements, data mappings, and documentation. Investigate APIs, databases, logs, and code to troubleshoot issues; validate integrations through testing and data verification; and coordinate product, engineering, underwriting, operations, and external partners. Use AI-assisted tools to create specifications and guides, improve integration patterns, and drive progress through influence and clear communication.

Build and operate scalable AI platform infrastructure enabling secure, reliable access to foundation models and AI agents. Responsibilities include developing model gateways, provider integrations, routing, usage controls, observability, governance, and self-service platform capabilities. The role involves architecting distributed systems, improving reliability and security, collaborating across engineering and product teams, mentoring engineers, and establishing high-quality engineering practices.

Architect and deliver complex distributed systems using Azure cloud-native technologies, microservices, APIs, and event-driven patterns. Lead architecture reviews, reliability initiatives, performance optimization, incident response, and root-cause analysis. Drive adoption of AI-assisted development tools while maintaining security and code quality. Collaborate across engineering, DevOps, QA, and product teams, and mentor engineers on technical design, development practices, and AI-enabled workflows.

Develops, integrates, tests, deploys, maintains, and troubleshoots enterprise software across Microsoft platforms. Builds web, desktop, cloud, Microsoft 365, API, and AI-enabled solutions, including generative AI and LLM applications. Gathers requirements from legal and business stakeholders, leads technical project work, supports vendors, improves development standards and roadmaps, and ensures secure, scalable application delivery.

Create and optimize high-quality, mobile-optimized character shaders and material workflows in Unity URP. Develop master materials, tools, and editor extensions (C#). Profile and debug performance on iOS/Android, collaborate with artists on look development, and ensure efficient rendering across mobile devices.

Develops, evaluates, integrates, tests, and debugs safety-critical Orion GN&C flight software supporting NASA’s JETS II contract. The role uses MATLAB, Simulink, C/C++, Python, and TRICK/JEOD for software development, simulation analysis, verification, and troubleshooting. It also improves flight software processes, procedures, build management, and integration activities while collaborating onsite with NASA personnel and contractor teams at Johnson Space Center.

Partners with stakeholders to gather requirements and deliver Salesforce and SiteTracker solutions. Configures platform objects, workflows, permissions, automation, and integrations; develops Apex, Lightning Web Components, Visualforce, and SOQL solutions. Supports solution design, testing, deployment, production troubleshooting, root-cause analysis, and continuous platform improvement while collaborating with Business, QA, and Development teams.