Top C# Jobs

Design, develop, support, and optimize LensCore, Snap’s C++ AR engine for Specs, Snapchat Lenses, and Lens Studio. Collaborate with teams to deliver features to Lens creators, participate in planning, and create technical specifications. The role requires strong C++ development, rendering or 3D engine experience, AI-assisted development, and familiarity with scripting, Linux, and command-line tools.

Develop and maintain C#/.NET applications using Angular and SQL Server. Responsibilities include designing solutions, writing clean code, debugging, resolving technical issues, supporting stakeholders, contributing to planning and agile project teams, and reporting project status. The role requires experience with large menu-driven business systems, data-intensive transactions, screens, and reports. Candidates must work onsite in Richmond, Virginia as needed, with limited remote work after the first month.

Design, build, and maintain high-throughput, low-latency C++ systems for symbol resolution. Develop scalable APIs, participate in design/code reviews, monitor and troubleshoot production, champion best practices, and mentor teammates.

Design, develop, and support high-performance equities OMS and electronic trading systems. Build low-latency C++ solutions, FIX connectivity, market data integrations, exchange interfaces, routing, execution, and risk controls. Collaborate with traders, product, operations, and risk teams; lead architecture and code reviews; optimize reliability and performance; and resolve production issues. The role also involves mentoring developers and advancing AI-assisted engineering practices.

Develop and maintain resilient banking applications using C# and .NET within SDLC standards. Responsibilities include requirements analysis, application design, coding, pull request and code reviews, source control, deployment, Azure modernization, data migration, stakeholder collaboration, and technical documentation. The role supports application stability, risk controls, audits, and regulatory requirements, while participating in Agile teams and an on-call rotation.

Develop and maintain macOS systems software using modern C++, Swift, and Objective-C++. Work with process models, IPC, Endpoint Security, Network Extension, security and cryptography APIs, device and storage frameworks, packaging, deployment, and MDM tooling. Profile and debug performance using Instruments, LLDB, os_log, and os_signpost, while creating tests with XCTest, sanitizers, fuzzing, and xcodebuild CI. Support shared codebases across macOS, Windows, and Linux.

Develop and maintain cross-platform macOS systems software using modern C++, Swift, and Objective-C++. Work with IPC, daemons, system extensions, network and endpoint security, device and storage APIs, code signing, packaging, and deployment. Profile and debug performance issues, build automated tests and CI pipelines, and support Apple Silicon and Intel systems. Nice-to-have experience includes SwiftUI, AppKit, macOS beta testing, and shipping EDR, antivirus, network security, or device-management products.

Develop and maintain trading, risk, and operations applications using C#, .NET, and SQL. Support solution design, automated testing, code reviews, web UI development with TypeScript and React, Python scripting, and production issue investigation. The intern will work with systems including trade booking, FIX connectivity, market data, P&L services, risk reporting, gRPC services, and internal business applications while collaborating with senior engineers.

Design, implement, test, and modernize backend services and integrations (TypeScript/Node.js and C++). Lead large projects, write technical specifications and API contracts, enforce coding standards, coach engineers, and drive legacy-to-modern migrations within online banking and core systems.

Design, develop, test, maintain, and document web applications for Life Sciences manufacturers. The role involves full-stack development with .NET, C#, databases, APIs, progressive web applications, cloud-native technologies, automated testing, CI/CD, and containerization. The developer collaborates with product engineering, marketing, and other teams to understand client needs, deliver features, improve existing products, and support next-generation software solutions.

Lead full‑stack development of web applications using C#, ASP.NET (Web Forms or MVC), HTML, CSS, and JavaScript libraries. Code, test, integrate, and document solutions; mentor teams; design complex systems; work with databases (preferred MongoDB) and deploy to web servers (preferred IIS).

Design, implement, and optimize low-latency C++ trading applications for automated options market making. Collaborate with traders and engineers to build production-ready systems, analyze performance issues, modify component interactions, rewrite Java applications in C++, and improve code for high throughput and low latency.

Designs, develops, optimizes, and maintains high-performance core engines and software platforms for technology-enabled play experiences. Responsibilities include hands-on implementation, testing, debugging, performance optimization, architecture decisions, code reviews, automated testing, documentation, continuous integration, and collaboration with software, firmware, and systems architecture teams.

Develop and optimize LensCore, Snap’s augmented reality engine for Specs, Snapchat Lenses, and Lens Studio. Responsibilities include designing C++ features, improving engine performance, collaborating with cross-functional teams to deliver creator-facing capabilities, and contributing to technical planning and specifications. The role requires rendering, 3D engine, computer vision, sensor, or machine learning experience, with preferred experience in modern C++, developer APIs, Qt, and relevant graphics libraries.

Build and maintain a full-stack financial services application replacing legacy workflows. Responsibilities include developing C#/.NET backend services, APIs, integrations, approval workflows, and a React portal; writing unit and regression tests; participating in Agile ceremonies and code reviews; documenting technical decisions; and collaborating with stakeholders and system-owning teams.

Develop and lead software efforts for unique underwater systems supporting U.S. Navy and Department of Defense customers. Responsibilities include software architecture, requirements analysis, documentation, testing, qualification, system integration, technical presentations, hardware trade studies, offshore installation support, and mentorship. The role requires collaboration with engineering leads, program managers, and customers, along with occasional work outside normal hours.

Design and build high-throughput, low-latency market data infrastructure in modern C++ for global equities, futures, and options venues. Develop reusable libraries for market data decoding, normalization, publishing, and consumption; collaborate with quantitative researchers; troubleshoot production issues; and maintain reliable 24/7 systems. The role requires strong concurrency, lock-free algorithm, memory-model, compiler optimization, serialization, and Python scripting expertise.

Develop and maintain privacy-focused protocol and wallet infrastructure in modern C++. Responsibilities include implementing transaction, consensus, and P2P components; integrating cryptography; supporting cross-platform libraries and CLIs; writing tests and fuzzers; optimizing performance; addressing side-channel risks; and documenting auditable designs. The role requires collaboration with cryptographers and protocol researchers on secure, reliable blockchain-related systems.

Design, implement, and optimize low-level systems software, networking components, protocols, and performance-critical applications. Develop client-server and socket-based systems using C++ and Python, apply algorithms and memory management techniques, and build comprehensive tests. Debug memory leaks, packet flow, and concurrent execution using GDB and Wireshark. Collaborate with cross-functional teams on modular codebases, technical documentation, code reviews, and release-cycle version control.

Develop and optimize high-performance C++ and Python software for robotics data collection systems. Build device-side recording systems for video, audio, IMU, and status data; develop middleware using IPC, shared memory, message queues, and zero-copy transfer; integrate hardware and software; and troubleshoot performance, stability, and system reliability issues across robotics, sensor, algorithm, testing, and data platform teams.

Develop and optimize onboard autonomous-driving software for strict latency, reliability, and compute-resource targets. Improve modular architecture, CPU/GPU/TPU utilization, simulation performance, and collision-avoidance reaction times. Collaborate with onboard and hardware teams on performance bottlenecks and hardware/software codesign. Build performance evaluation, debugging, and change-management processes for large-scale vehicle and cloud systems.

Develop and maintain web, mobile, API, and data marketplace features within Agile Scrum teams. Migrate products to Azure and other public cloud environments, automate build, test, and deployment pipelines, improve test coverage, conduct peer reviews, implement security controls, and troubleshoot production issues. The role requires scalable software and query optimization, cross-team collaboration, continuous improvement, and responsible use of AI tools.

Develop and support enterprise B2B and B2C eCommerce solutions using .NET/C# and Optimizely Configured Commerce. Build commerce capabilities, integrations, APIs, and event-driven services; troubleshoot application and database issues; optimize performance, scalability, accessibility, and SEO; participate in code reviews; and collaborate with product, architecture, frontend, integration, and business teams.

Develop and maintain scalable Microsoft technology solutions using C#, .NET, ASP.NET, MVC, Web API, SQL Server, and front-end technologies. The role requires expertise in multi-threaded programming, design patterns, MVVM, Knockout JS, BizTalk configuration, EDI transactions, Agile development, and production support. The developer will collaborate with development teams and architects while ensuring system performance, availability, and timely issue resolution.

Develop and maintain ArcGIS Pro’s ModelBuilder workflow-based diagramming interface and supporting backend APIs. Build user-friendly frontend and robust C++ and .NET functionality, diagnose performance issues, resolve memory and concurrency problems, collaborate in an agile team, and contribute to unit testing and quality software releases.