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Senior C# Engineer role (test posting) requiring about five years of experience developing applications using .NET Core and C#.

Develop and implement machine learning models for evaluating disputes and chargebacks, and create a model orchestration layer. Collaborate on data use for enhanced user experiences.

The .NET Developer will analyze requirements, write design specifications, and conduct software testing and performance tuning while being a proactive team player.

Design and guide the implementation of payment systems, troubleshoot issues, and lead technical discussions while partnering with various teams.

Own technical onboarding, integrations, and go-live for contracted messaging customers. Debug delivery and integration issues, build sample integrations, advise on resilient messaging architectures, run QBRs, drive expansion, and act as technical liaison to engineering and product.

The Product Manager will own product areas end to end, shaping solutions, driving execution, and making tradeoffs to enhance automation and customer experiences. Responsible for roadmap priorities and aligning teams to meet metrics and product goals.

Build and own Phia's full-stack GTM infrastructure: internal tools, partner dashboards, CRM and sales automations, AI-driven brand intelligence, editorial automation, and real-time data integrations to scale revenue operations and partner workflows.

Embed with engineering firms to observe workflows, design and ship production front-ends, establish and own a cross-product design system, define interaction patterns for AI-native workflows (streaming, human-in-the-loop, provenance), and collaborate with the CTO on product strategy and architecture.

As Co-Founder & Operating Partner, you'll co-develop business strategies, lead growth initiatives, manage client processes, and expand legal partnerships, while building scalable operations for a startup focused on global citizenship.

The Integration Developer supports and maintains Rhapsody and .NET applications, automates workflows, and modernizes legacy systems for public health data exchange.