Top Remote Senior C# Jobs in NYC, NY

As a Staff Software Engineer, you will lead technical strategy for the Cash App Banking team, collaborate on solutions, mentor engineers, and focus on robust, scalable systems for consumer banking needs.

As a Software Engineer on the Compute team, you will build and optimize systems for data processing, SQL querying, and improve the performance of code execution. You will tackle complex engineering challenges spanning backend data systems to frontend applications, ensuring efficiency and usability.

Lead full‑stack development for Gusto's Time and Scheduling product: design, build, test, and iterate frontend and backend systems. Mentor engineers, own multi‑quarter projects, address large‑scale refactors, performance and reliability, and collaborate with product, design, data, and platform teams to deliver customer‑focused features.

The Senior Software Engineer will design and optimize recommendation algorithms, maintain data pipelines, and improve personalized user experiences using machine learning techniques and backend engineering skills.

Staff Software Engineer leading insurance and cost-transparency features for a healthcare marketplace. Responsibilities include technical leadership, system design, roadmap ownership, hands-on development with C#, React, and AWS, mentoring engineers, improving engineering practices, collaborating cross-functionally, and delivering scalable, highly available products. The role requires strong product judgment, distributed backend systems expertise, developer productivity improvements, and experience working with third-party vendors and data providers.

Design and build Alloy’s go-to-market technology architecture, including CRM integrations, iPaaS automations, data pipelines, and workflow improvements. Develop SQL, Python, and JavaScript scripts for data manipulation and automation; monitor data quality and system performance; support reporting and BI dashboards; troubleshoot integration issues; and advise on GTM technology, vendors, and build-versus-buy decisions. Partner with RevOps, Sales, Marketing, Customer Success, IT, and leadership to translate business needs into scalable technical solutions.

Design and implement Android features from design through launch, optimize mobile UX and performance, perform code reviews, evaluate technical tradeoffs, and use AI tools to streamline development while maintaining security and production-quality code.

Build and own backend services for a private markets investing platform. Deliver end-to-end software across design, implementation, testing, deployment, and operations. Collaborate with product and engineering teams, iterate on ambiguous problems, apply distributed systems principles, and incorporate AI/LLMs for data extraction and document generation. Participate in recruiting and maintain high-quality delivery practices.

The Staff Software Engineer will design and implement the backend architecture for Marimo's molab, focusing on high availability, low latency, and system stability, while utilizing CoreWeave's infrastructure.

Own and improve the data foundation for Radar's geocoding platform: model and serve location data, build large-scale ingestion and integration pipelines, improve coverage and quality, apply LLMs/agents for enrichment and labeling, work across Scala/Python/Rust and the Node.js API, operate systems at very high throughput, and engage with customers to inform product decisions.