Senior .NET Full-Stack Engineer

Mission Telecom

10h • $120,000 - $140,000

About The Position

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.

Requirements

• 7 or more years of professional software development experience, or equivalent demonstrated experience building and supporting complex production business applications.
• Advanced proficiency with C#, .NET, ASP.NET Core, and modern full-stack web application development.
• Proven ability to design, build, and support REST APIs and integrations with third-party business systems.
• Proficiency with SQL, relational database design, data modeling, indexes, keys, query optimization, and database troubleshooting.
• Experience building and supporting business-critical transactional or operational applications where data accuracy, reliability, and auditability matter.
• Ability to translate business processes and requirements into reliable software solutions and independently own delivery through release and support.
• Knowledge of application security, authentication, authorization, identity management, and secure development practices.
• Experience deploying, monitoring, troubleshooting, and supporting cloud-hosted applications and CI/CD pipelines.
• Effective communication and problem-solving skills with both technical and non-technical stakeholders.
• Ability to use AI-assisted development tools productively while independently understanding, reviewing, troubleshooting, and writing production code.

Nice To Haves

• Experience with every listed platform is not required. Candidates should demonstrate the ability to quickly learn unfamiliar applications, APIs, and integration requirements.
• Blazor Server strongly preferred, with experience in comparable component-based web application frameworks also considered.
• Telecom provisioning, carrier APIs, device and SIM/eSIM workflows, or comparable service-provider integrations.
• Scripting and automation using PowerShell, Python, C#, SQL, Azure CLI, or comparable tools.
• PostgreSQL and Entity Framework Core.
• Microsoft Azure services including App Service, PostgreSQL, Key Vault, Application Insights, networking, and managed identities.
• Microsoft Entra ID, including app registrations, enterprise applications, permissions, and authentication.
• Integration experience with platforms such as HubSpot, Salesforce, Apollo.io, RB2B, NetSuite, payment processors, communications platforms, or telecom providers.
• GitHub Actions or comparable CI/CD tooling.
• Playwright or comparable automated end-to-end testing frameworks.
• Bachelor's degree in computer science, information systems, software engineering, or a related discipline, or equivalent professional experience.

Responsibilities

• 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.
• 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.
• 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.
• 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.
• 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 maintain appropriate technical documentation for applications, integrations, configuration, and support procedures.
• Use AI-assisted development tools and coding agents to improve productivity across analysis, development, testing, troubleshooting, documentation, and code review.
• Work within a structured AI-assisted development process that uses scoped tasks, review checkpoints, independent validation, and documented review before release.
• Evaluate AI-generated code for correctness, security, performance, and maintainability.
• Independently understand the codebase, design solutions, write and modify production code, and troubleshoot issues without reliance on generated output.
• Use AI tools within approved security and data-handling requirements and independently verify generated work before release.

Benefits

• Fully paid medical, dental, vision, short- and long-term disability, and life/AD&D insurance
• 85% of dependent coverage for medical, dental, and vision
• Partial phone and internet reimbursement
• 5% Safe Harbor contribution into a 401(k)
• Unlimited PTO plus 14 paid holidays per year

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Education Level: Associate degree