Senior .NET Full-Stack Engineer

About this role

Mission Telecom is a 501(c)(4) nonprofit wireless broadband provider and grantmaking foundation. We partner with nonprofits, schools, and libraries to close the digital divide through reliable, affordable wireless broadband and connected devices, and through Mission Telecom Giving, we fund social impact organizations working to advance equity and justice. Our grantmaking focuses on multiracial democracy, movement infrastructure and innovation, and telecom justice, including broadband affordability policy.
About the Role
Mission Telecom is seeking a Senior .NET Full-Stack Engineer to develop and support software systems, integrations, and automations across the organization. A central focus is Mission Connect, our custom business application supporting sales, customer management, billing, payments, fulfillment, and operational workflows. Mission Connect is nearing its initial production launch with an established architecture, automated testing and deployment controls, and defined engineering standards. After launch, this position will assume primary engineering ownership of the platform.
This is a broad, hands-on role spanning full-stack development, integrations, PostgreSQL, security, Azure operations, and production support. The role reports to the CTO, who remains actively involved in architecture, priorities, release planning, and technical escalation, and works directly with leadership and business stakeholders to turn operational needs into reliable software.
Key Responsibilities
Application Development and Business Automation

• Design, develop, test, maintain, and support Mission Telecom software applications using C#, .NET 10, ASP.NET Core, Blazor Server, Radzen, and related technologies.

• Build staff and customer-facing interfaces, application services, business logic, background processing, and data-access functionality.

• Serve as the primary hands-on engineer for software systems, partnering with the CTO and business stakeholders on priorities, technical decisions, and release planning.

• Own the technical design and implementation of assigned application features and enhancements within Mission Telecom's established technology direction.

• Translate business processes and operational requirements into automated workflows supporting grantmaking, marketing, lead management, sales, billing, payments, fulfillment, customer service, reporting, and other organizational functions.

• Deliver maintainable, incremental enhancements to existing applications and workflows.

• Develop scripts, utilities, and automation for data exchange, system administration, diagnostics, deployment, integration support, and operational tasks.

• Own assigned work from requirements and technical design through development, testing, deployment, and support.
APIs and System Integrations

• Design, build, maintain, and troubleshoot secure integrations between internal and third-party systems.

• Develop and consume REST APIs, webhooks, SDKs, file-based exchanges, and other system-to-system integration methods.

• Support integrations across CRM, marketing, lead generation, advertising, analytics, accounting, payments, communications, and telecom platforms, including systems such as HubSpot, Salesforce, Apollo.io, RB2B, Google, Meta, NetSuite, payment processors, and service providers.

• Implement reliable patterns for authentication, synchronization, error handling, retries, rate limits, duplicate prevention, and reconciliation.

• Diagnose and resolve integration issues across applications, data, authentication, and third-party platforms.

• Design integrations that can adapt as Mission Telecom's business systems and processes evolve.
Databases and Financial Systems

• Design, maintain, troubleshoot, and optimize PostgreSQL and other databases supporting Mission Telecom.

• Work with relational data models, tables, relationships, primary and foreign keys, constraints, indexes, SQL queries, Entity Framework Core, and application data access.

• Diagnose database performance, concurrency, and data-integrity issues.

• Plan and execute controlled database schema changes using established migration, validation, and deployment practices.

• Develop and support financial and operational workflows involving orders, invoices, payments, taxes, adjustments, refunds, provisioning, and customer accounts.

• Build and maintain NetSuite and payment processor integrations with appropriate transaction integrity, auditability, and reconciliation.

• Maintain appropriate customer data isolation and financial correctness across billing, tax, payment, and reconciliation workflows.
Security and Identity

• Develop and maintain authentication, authorization, and role-based access controls.

• Configure and support Microsoft Entra ID capabilities used by applications, including app registrations, enterprise applications, permissions, managed identities, secrets, and certificates.

• Work with OAuth 2.0, OpenID Connect, and related identity standards.

• Apply secure development practices to customer information, financial data, APIs, file handling, application access, and cloud resources.
Azure Operations and Software Quality

• Deploy, monitor, troubleshoot, and support applications and services within Microsoft Azure.

• Work with Azure App Service, PostgreSQL, Key Vault, Application Insights, managed identities, networking, configuration, logging, and related services.

• Build and maintain CI/CD processes using GitHub and GitHub Actions or comparable tooling.

• Own application monitoring, incident investigation, recovery procedures, and root-cause resolution, with the CTO providing technical backup and escalation support.

• Develop and maintain unit, integration, and end-to-end automated testing for business-critical workflows.

• Use Playwright or comparable tools to validate important staff and customer workflows.

• Perform code reviews and maintainappropriate technical documentation for applications,…