Fullstack Developer - C#

Banyan Software is the best permanent home for software businesses that serve specialized industries, their employees, and their customers. We are on a mission to acquire, build, and grow great companies worldwide, helping them modernize through shared AI expertise and operational discipline. The Banyan Software Foundation, endowed with $100 million in Banyan stock, leverages technology to build a greener and more equitable world. Banyan is Great Place to Work Certified, a five-time Inc. 5000 honoree, and a top 10 company on the Deloitte Technology Fast 500. Founded in 2016 and headquartered in Atlanta, Banyan operates more than 100 portfolio companies across North America, the UK, EU, and APAC. About the Role We are looking for a skilled backend software engineer to maintain, extend, and improve our Pipelines integration platform — a distributed data pipeline system built on .NET Framework 4.8 that ingests, parses, stages, and reports on operational data from multiple third-party systems across the energy/drilling industry. The successful candidate will also take the lead in migrating the current .NET Framework application to .NET Core. What You Will Work On The platform is a C# / .NET Framework 4.8 Windows Service solution consisting of: Customer adapter services — customer-specific integration services that orchestrate data pipelines Reusable API libraries — shared integration adapters for third-party systems including Graph API, REST API, SQL, and NoSQL Pipeline stages — each managed via Azure Service Bus message queues Key Technologies Runtime C# / .NET Framework 4.8 Messaging Azure Service Bus Storage Azure Data Lake Storage (Gen2) Database MongoDB (via MongoDB.Driver), Azure SQL / on-premises SQL Server Secrets & Auth Azure Key Vault Monitoring Azure Application Insights Migration Target C# / .NET Core Responsibilities Maintain and extend the multi-customer Windows Service pipeline executables Add new customer adapter projects following established patterns Develop new third-party integrations (ingest adapters, parse services, staging jobs) Extend the custom grammar expression engine for new mapping scenarios Manage Azure infrastructure components: Service Bus queues/topics, Data Lake paths, Key Vault secrets, App Insights monitoring Diagnose performance and reliability issues using Application Insights and logs Write and maintain unit and integration tests Manage NuGet package upgrades and resolve dependency conflicts Lead the migration of the .NET Framework application to .NET Core Required Skills & Experience 8+ years with C# and .NET Framework (4.x) — comfort with async/await, DI, and service-oriented patterns 8+ years with C# and .NET Core Knowledge of Azure Data Factory or similar orchestration tools Experience integrating with Azure services: Service Bus, Key Vault, Data Lake Storage, Application Insights Proficiency with SQL Server (Azure SQL and on-premises) Familiarity with MongoDB driver and BSON pipeline queries Understanding of OAuth 2.0 / JWT authentication flows and certificate-based auth Experience consuming REST APIs with HttpClient Nice to Have Broader Azure platform experience beyond the core services listed above Experience with Windows Services and long-running background service patterns Familiarity with custom DSL / grammar expression engine design Diversity, Equity, Inclusion & Equal Employment Opportunity at Banyan: Banyan affirms that inequality is detrimental to our Global Teams, associates, our Operating Companies, and the communities we serve. As a collective, our goal is to impact lasting change through our actions. Together, we unite for equality and equity. Banyan is committed to equal employment opportunities regardless of any protected characteristic, including race, color, genetic information, creed, national origin, religion, sex, affectional or sexual orientation, gender identity or expression, lawful alien status, ancestry, age, marital status, or protected veteran status and will not discriminate against anyone on the basis of a disability. We support an inclusive workplace where associates excel based on personal merit, qualifications, experience, ability, and job performance. Recruitment Notice Banyan Software may use artificial intelligence (AI) tools to assist in screening and/or assessing applicants during the recruitment process. All hiring decisions are made by our team. Personal information submitted through your application will be collected and used for recruitment purposes in accordance with applicable privacy laws. Contact us at any time with questions about our process or to request accommodation. Beware of Recruitment Scams We have been made aware of individuals fraudulently posing as members of our Talent Acquisition team and extending fake job offers. These scams may involve requests for personal information or payment for equipment. Protect yourself by following these steps: Verify that all communications from our recruiting team come from an @banyansoftware.com email address. Remember, employers will never request payment or banking information during the hiring process. If you receive a suspicious message, do not respond — instead, forward it to careers@banyansoftware.com and/or report it to the platform where you received it. Your safety and security are important to us. Thank you for staying vigilant.