Advanced .NET Software Engineer (Systems Modernization) at Growth Acceleration Partners

Colorado Springs, Colorado, United States -

Full Time

Start Date

Immediate

Expiry Date

01 Oct, 26

Salary

0.0

Posted On

03 Jul, 26

Experience

2 year(s) or above

Remote Job

Yes

Telecommute

Yes

Sponsor Visa

Skills

C#, .NET 8, .NET Framework 4.8, SQL Server, ASP.NET MVC, ASP.NET Web API, WebForms, Dapper, Entity Framework 6, Azure DevOps, Claude Code, Datadog

Industry

IT Services and IT Consulting

Description

WHAT WE DO Founded in 2007, Growth Acceleration Partners (GAP) is a consulting and technology services company. We consult, design, build and modernize revenue-generating software and data engineering solutions for clients. With modernization services and AI tools, we help businesses achieve a competitive advantage through technology. GAP’s remote, integrated engineering teams use end-to-end solutions to innovate and align with your business goals. We have 600+ English-speaking engineers based in Latin America and approximately 20 U.S.-based engineers. With some of the highest customer satisfaction scores in the industry, GAP’s focus is customer and employee success. GAP is a woman-owned company headquartered in Austin Texas. We are a values-based company focused on growing our people by investing in education, onsite English classes and training in the latest technologies, including AI, data analytics and machine learning. Our goal is to provide solutions for our customers that help them achieve critical business outcomes, while enabling our GAPSters and our communities to attain long-term success. Summary We are seeking an Advanced .Net Software Engineer to join the Customer Success Platform team, responsible for maintaining, stabilizing, and incrementally modernizing critical internal systems supporting customer care, billing/refund workflows, and support operations across TaxAct and Drake. This role is highly platform-and-backend-leaning, requiring an engineer who thrives on diving into complex, inherited enterprise codebases spanning both legacy and modern Microsoft stacks. Rather than defaulting to a rewrite, you will focus on operational safety, system mapping, and making targeted code and data improvements. You will also use agentic AI tools like Claude Code responsibly to accelerate codebase discovery, documentation, and production debugging. Education Bachelor’s Degree in Computer Science, Software Engineering, Information Systems, or a related technical field (or equivalent professional work experience in enterprise application support). Professional Experience 3+ years of professional experience in C#/.NET engineering, with a verified history of maintaining, stabilizing, or modernizing legacy enterprise applications. (5+ years of experience with independent ownership of inherited production platforms required for Senior calibration). Deep experience performing data-driven debugging, troubleshooting production incidents, and working directly with complex database architectures. Proven experience writing technical documentation, developer runbooks, or cross-system architecture maps. Experience collaborating directly with non-engineering stakeholders, internal business units, or Help Desk operations. Key Responsibilities Maintain, debug, and enhance business-critical customer support applications, expert-help systems, and billing/refund management portals. Support the platform's strategic absorption of newly inherited systems by systematically identifying hidden dependencies, hosting environments, database structures, and support paths. Diagnose and resolve complex production incidents across application logic, SQL Server schemas, authentication boundaries, and IIS deployment environments. Drive the incremental modernization of legacy applications, specifically focusing on upgrading authentication frameworks, session state management, observability, and deployment pipelines. Author comprehensive runbooks, technical documentation, and triage guides to capture system knowledge and reduce future cognitive load across the engineering group. Collaborate cross-functionally with Engineering, Product, Help Desk, IT/Networking, and Customer Success partners to isolate and solve boundary-crossing system flaws. Integrate agentic development tools (Claude Code) into your workflow to rapidly explore unfamiliar repositories, reverse-engineer undocumented logic, and scaffold automated regression coverage. Required Technical Skills Core Languages & Frameworks: Advanced mastery of C# within both .NET Framework 4.8 and modern .NET 8 architectures. Legacy Web Architectures: Practical development exposure to ASP.NET MVC, ASP.NET Web API, WebForms, ASMX services, and VB.NET application patterns. Database & Data Access: Strong SQL Server competence, including building/debugging complex stored procedures, data migrations, and working with Dapper, EF6, or ADO.NET-style data layers. Agentic Coding Harnesses: Proficiency using modern AI-assisted engineering tools (specifically Claude Code, Cursor, or OpenAI Codex) to map code structures and accelerate debugging. Observability & Diagnostics: Experience analyzing production environments using structured application logs, metrics tracking, and platform tools (Datadog, Splunk, NLog, or log4net). Source & Release Management: Competence navigating Azure DevOps configurations, pull requests, deployment pipelines, and environment variables. Nice to Have Familiarity with legacy UI patterns (Razor, jQuery, Bootstrap) paired with exposure to modern web libraries like Vue 3, TypeScript, and Vuetify. Experience managing identity and access systems involving Okta, OIDC, claims-based authorization, shared auth cookies, and cross-application session states. Exposure to foundational cloud services (AWS Systems Manager Parameter Store, Secrets Manager, CloudWatch, S3, EC2, CodeDeploy, or similar). Prior experience with background services, polling workers, Topshelf, scheduled batch processing, or Windows Services. Custom WordPress integration exposure, including custom plugins, WP Engine operations, or REST API connections. Experience in tax preparation systems, fintech, payment gateways, or highly compliance-heavy industries. Soft Skills Advanced English proficiency with strong written and verbal technical communication skills. Exceptional "system archeology" mindset—comfortable operating with incomplete documentation, navigating technical debt, and learning through discovery. Outstanding plain-language translation skills to effectively collaborate and explain system behaviors to non-engineering business stakeholders. Pragmatic engineering judgment: a clear focus on triage safety, risk mitigation, rollback planning, and knowing exactly when to fix versus when to escalate. At Growth Acceleration Partners, we're an equal opportunity employer committed to building a diverse and inclusive team. We value everyone's unique background, and we provide equal opportunities regardless of race, color, creed, religion, sexual orientation, gender identity, age, national origin, disability, marital status, veteran status or any other personal right protected by law. We foster a culture of belonging and strive to provide a welcoming environment where everyone feels safe to contribute and grow.

Responsibilities

Maintain and incrementally modernize critical internal systems for customer care, billing, and support operations. Focus on operational safety, system mapping, and resolving complex production incidents across legacy and modern Microsoft stacks.