44,366 C# jobs
Open roles that use C# and the .NET ecosystem.
Principal Software Engineer- Agentic Customer Care
Principal engineer on Roblox's Trust & Safety 'Safety Experience' team, building agentic, LLM-powered applications and chatbot solutions for customer-facing and internal safety systems at scale. The role provides technical leadership and mentoring, working with C#/Java/Python, microservices, REST/RPC, and machine learning.
Senior Software Engineer, Creator Collaboration
Designs and builds large-scale services for creator collaboration at Roblox, including the real-time Team Create product and the Creation Platform APIs that AI agents access via MCP. Full-stack work in C#, C++, Java, or Python, with emphasis on scale, architecture, and mentoring other engineers.
Principal Software Engineer, Core Services
Principal engineer on Roblox's Core Services team, building and evolving the shared C#/.NET and Rust frameworks, libraries, and runtime infrastructure behind Roblox's global platform. Day-to-day is hands-on systems work across performance, concurrency, API design, and managed/native interop, plus technical leadership and mentoring.
Senior Software Engineer, Reliability
Senior software engineer on Roblox's Reliability team, building fault-tolerant libraries, automation, load-testing guardrails, canarying services, and observability tooling to keep the platform reliable at massive scale. Requires 4+ years of experience and coding skills in languages like Go, C#, or Java.
Software Engineer, Test Frameworks & Tooling
Engineer on Roblox's Test Frameworks & Tooling team, designing and scaling the test automation infrastructure behind Roblox's services — frameworks, runners, orchestration, AI-assisted test generation, canary analysis, and debugging tools — using languages like C#, Go, or Python, onsite in San Mateo, CA.
Technical Developer Connections Manager
Every day, tens of millions of people come to Roblox to explore, create, play, learn, and connect with friends in 3D immersive digital experiences– all created by our global community of developers and creators. At…
Senior Software Engineer, Test Frameworks & Tools
Senior engineer on Roblox's Test Frameworks & Tooling team building and scaling backend services for the test automation lifecycle — frameworks, orchestration, AI-assisted test generation, canary analysis, and debugging tools. Requires 2+ years backend/infra experience with C#, Go, or Python; onsite in San Mateo Tue–Thu.
Software Engineer, Creator Services Communication
Builds the communications plane for the Roblox platform — cross-server messaging, developer HTTP/teleport APIs, and compute functions — solving distributed-systems and networking problems at many-million-player scale. Full-stack work spans the C++ engine, C# services, Kafka/Flink, Redis/Elasticsearch/Clickhouse, and React UIs. Onsite Tue–Thu in San Mateo.
Business Applications Web Developer
Junior developer joining an in-house IT team at a civil engineering firm to build, maintain and enhance internally developed web-based business systems. Core stack is C#, .NET, JavaScript and SQL Server, with work spanning REST APIs, system integrations, automation and the full development lifecycle alongside a senior developer.
Software Engineer, Reliability
Early-career software engineer on Roblox's Reliability team, building infrastructure that keeps the platform fast, reliable, and efficient: applying AI/ML to scale workloads across regions, tuning performance with metrics and profiling, and sharing on-call. Core tech: Python/Rust/Go/Java/C#, distributed systems, Kubernetes, Prometheus/Grafana.
Senior Software Engineer, Build Platform
Senior engineer on Roblox's Build Platform team builds and operates the cloud backend powering AI-driven game creation: agent orchestration, model routing, sandboxed tool execution, evals, and observability at scale. Core stack includes C#/Java/Go, Kubernetes/Temporal, and LLM APIs; role is onsite in San Mateo Tue-Thu.
Senior Software Engineer, Ads Measurement
Senior engineer on Roblox's Ads Measurement team architecting large-scale ads serving, attribution/identity-matching, and audience-segmentation backend systems, plus third-party measurement integrations. Stack includes C#/Go/Rust/Java/C++/Python, Kafka, Flink, Redis, and distributed SQL/NoSQL; onsite Tue–Thu at the San Mateo, CA HQ.
Senior Software Engineer, Content Understanding
Senior full-stack engineer on Roblox's Content Understanding Platform, building scalable backend systems and ML pipelines that process billions of assets (3D models, audio, text, video) to power search, discovery, moderation, and generative AI features. Stack spans Python/C#/C++/Java, cloud backends, PyTorch/TensorFlow, and some React/Angular.
Software Engineer
Full-stack engineer developing and supporting Certis' security enterprise platform: building React/TypeScript web apps, C#/ASP.NET Core microservices and REST APIs, working with PostgreSQL/SQL Server, Redis and messaging (NATS/Kafka/RabbitMQ), and deploying via Docker/Kubernetes in cloud and on-prem environments.
.NET Fullstack Developer
Deploja AB, a Swedish IT consulting firm, is recruiting a .NET fullstack consultant in Solna for client assignments building C#/.NET (versions 8–10) APIs — preferably composite APIs — and Angular single-page applications deployed on OpenShift. Assignment-based employment; banking/financial services experience is a plus.
Backend Engineer
Backend engineer on Papaya Gaming's WildCard squad in Tel Aviv, building and owning high-scale backend features (store, collectibles, rankings, social layer, in-game economy) for a skill-based mobile gaming platform serving millions of players. Day-to-day spans design, production ownership, A/B testing, and AI-assisted development with Node.js, TypeScript, AWS, Kubernetes, Redis, and MySQL.
Backend Team Lead
Backend Team Lead at Upwind Security, leading a team to design and build scalable cloud-native backend systems, using technologies like Kubernetes, Neo4j, ElasticSearch, and others, with responsibilities including project lifecycle management, tech decisions, and team growth.
Senior .Net Full Stack Developer - C#/React.js
Senior full-stack developer building and maintaining enterprise applications with a C#/.NET backend, ReactJS frontend and SQL Server database. Uses AI-assisted development (GitHub Copilot agentic mode, SpecKit) while collaborating with the Hitachi Energy Technology Services team on design, releases and defect resolution.
Full Stack Developer III
Fully remote (US) senior developer role at a North Carolina managed-care organization: leads design and architecture of complex full-stack applications, resolves advanced issues, reviews code quality, and guides dev teams. Core stack is ASP.NET/C#, JavaScript/HTML/CSS, SQL, IIS, and Azure DevOps.
Account Solution Architect
Account-level Tech Lead / Solution Architect at N-iX, owning the technical direction for a transit passenger-information-systems client: discovering and migrating legacy C#/C++/Java systems onto a Python-on-Azure, MQTT-based event-driven cloud platform, guiding delivery teams, bridging business and engineering, and driving AI adoption.