Top C++ Jobs in St. Louis, MO

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.

Develop and test systems-level C++ software that defines and enforces endpoint behavior. Initially, the engineer will own testing infrastructure and coverage for two active projects, then contribute to feature development. The role requires strong C++ fundamentals, automated testing experience, and interest in operating-system concepts such as processes, file systems, services, and APIs. Work includes learning unfamiliar systems, collaborating effectively, and supporting reliable endpoint security and management capabilities.

Develop and architect a cross-platform C++ endpoint patching agent for Windows, macOS, and Linux. Responsibilities include code reviews, mentoring engineers, improving development processes, collaborating across patching teams, and translating product needs into resilient technical designs. The role involves system-level APIs, patch installation and rollback logic, embedded databases, and client-server integration.

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, 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.

Lead end-to-end development of secure, scalable web applications and data solutions supporting clinical trial operations. Design frontend and backend components using C#/.NET, Angular, AWS, and relational or non-relational databases. Guide architecture, testing, deployment, CI/CD, security, cloud optimization, and regulatory compliance. Mentor developers, oversee technical delivery, troubleshoot complex issues, and lead migration and modernization of on-premises applications to AWS.

Develop and support scalable enterprise web applications for Allstate’s Individual Health Sales business. Responsibilities include designing systems, building full-stack features with C#, ASP.NET, and front-end frameworks, practicing test-driven development, creating CI/CD pipelines, supporting production software, and collaborating in Agile/Scrum ceremonies. The role also involves API and database development, technical decision-making, debugging, knowledge sharing, and continuous improvement.

Lead the architecture, design, and implementation of core MarkLogic database features using C++. Build scalable, fault-tolerant distributed systems; optimize performance; debug complex server-side issues; and mentor engineers. Collaborate with product, development, QA, and documentation teams to deliver secure, high-quality database capabilities involving search, security, language runtimes, JavaScript integration, scalability, and reliability.

Develop and maintain backend services and RESTful APIs using C# and .NET. Design and optimize MySQL schemas and queries, troubleshoot production and staging issues, improve performance and scalability, document architecture, and uphold code quality and security. Collaborate with cross-functional teams in a fully remote environment while contributing to development best practices and continuous improvement.

The C# Developer will design, develop, and support IT solutions using various technologies, ensuring feasibility and leading project initiatives during the software development life cycle.

The Senior Programmer Analyst will develop systems, code and document programs, assist with system design, and improve IT processes and techniques.

The Junior C# Developer will assist in developing system designs, coding, testing, and documenting programs under supervision, while suggesting process improvements.

As a Web Developer, you'll collaborate in a Scrum/Agile team to design and develop web applications using C#, .NET, HTML, and JavaScript, among others.

Develop and optimize high-throughput, low-latency C++ applications for performance and reliability. Responsibilities include identifying bottlenecks and bugs, refactoring code, conducting peer reviews, developing automated tests, debugging multithreaded systems, and collaborating with QA, Operations, architects, product owners, and cross-functional teams to resolve performance issues.

Contribute to high-performance, real-time applications processing critical financial data. Collaborate with teams, develop clean applications, and maintain testing strategies.

Lead and implement observability strategy for Real‑Time Collections, perform hands‑on low‑latency C++ work, embed observability practices across SDLC, define SLIs/SLOs and dashboards, establish GitOps/API-driven observability workflows, and influence platform architecture and reliability.

Evaluate AI coding-agent interactions for usefulness, correctness, engineering judgment, reasoning quality, and developer trust. Provide clear, opinionated feedback, distinguish response-quality levels, and help define standards for excellent interactions with tools such as OpenAI Codex, Claude Code, and Cursor. This contract role requires staff- or principal-level software engineering experience and familiarity with modern AI-assisted development workflows.

Design and implement complex low latency, high throughput software for financial data distribution, conduct testing, and improve software reliability.

The C# / .NET Developer will design and maintain middleware applications, build Shopify integrations, and support a mobile app backend in a remote work environment.

Design and evaluate performance engineering tasks for AI training/evaluation. Optimize runtime, compilers, memory, CPU/GPU and concurrency. Produce documented solutions, evaluate AI-generated code, and build evaluation frameworks and scoring rubrics while collaborating with researchers and SMEs.

Develop user interface components for ArcGIS Pro using C# and WPF, work in an agile team, and design software solutions for raster and imagery processing.

PrivateID seeks a Principal C++ Engineer with at least 10 years of experience to lead complex systems and scale their platform in a remote-first environment.

Build and maintain scalable, cloud-native APIs using .NET. Enhance core platform components, lead architecture and testing discussions, optimize telemetry and performance, collaborate cross-functionally, conduct code reviews, and mentor team members.

You will develop and maintain components of the LLVM based toolchain, collaborating with the community while ensuring platform-specific optimizations and tests.

As a C++ Software Engineer, you will design and develop software solutions, ensuring performance, stability, and quality through testing and collaboration with teams.