Senior Software Engineer

DocuPhase LLC•Clearwater, FL

23d

About The Position

We are seeking an experienced Senior Software Engineer to join our software development team working on mission-critical financial technology applications. You will be responsible for developing and maintaining large-scale invoice processing, accounts payable, and document management systems serving enterprise clients across multiple industries. The ideal candidate brings hands-on experience in financial or B2B software, with a strong understanding of AP/AR workflows, Payments systems, and broader Finance domain processes. Finance Domain Experience - Strongly Preferred: Given the nature of our core products — invoice processing, vendor payment management, and AP automation — we place significant value on candidates with real-world experience in: Accounts Payable (AP) and/or Accounts Receivable (AR) software development or operational systems Payments platforms including ACH, wire transfer, virtual card, and payment processing workflows Invoice processing, purchase orders, remittance processing, and B2B document exchange (EDI) Financial Technology (FinTech) products serving enterprise or mid-market clients ERP integrations — SAP, Oracle, NetSuite, QuickBooks, Microsoft Dynamics, or similar platforms Audit trail design, financial data integrity, and compliance-aware software development Spend management, treasury operations, or general ledger (GL) system connectivity

Requirements

Advanced C# and VB.NET proficiency — mixed-language enterprise codebase
.NET Framework 4.6–4.8 — extensive experience with legacy .NET Framework applications
.NET 6/7/8 — modern .NET development for new platform initiatives
ASP.NET Web Forms and MVC — maintain and enhance hybrid web applications
ASP.NET Web API — build and maintain RESTful services and integrations
Entity Framework — data access and ORM patterns (Code First and Database First)
Windows Services — background processing services for document workflow automation
Blazor Server — build modern web UIs for SaaS platform
AngularJS — maintain existing frontend components
JavaScript/jQuery — legacy frontend maintenance with jQuery UI and validation
XSLT transformations — XML-based templating systems
Telerik UI Components — enterprise UI components for legacy and modern applications
OAuth 2.0 & JWT — modern API authentication and security
SQL Server — complex stored procedures, functions, and database design
Database-first development — schema changes, migrations, and performance optimization
ADO.NET — custom data access patterns and legacy integration
Amazon S3 — cloud document storage and management
Multi-tenant SaaS architecture — customer-specific configurations and customizations
EDI processing — Electronic Data Interchange (810, 850, 855, 856 transaction sets)
File processing — CSV, XML, fixed-width file imports/exports
SOAP/REST web services — external system integrations
Payment processing integrations — financial system connectivity
MSBuild and Visual Studio — build automation and deployment
IIS deployment and management — Windows-based web application hosting
Git version control — large enterprise codebase management
PowerShell scripting — deployment and automation tasks
Azure DevOps Pipelines — CI/CD with YAML configurations and automated testing
NuGet Package Management — private Azure Artifacts feeds and dependency management

Nice To Haves

Bachelor's degree in Computer Science or related discipline.
5+ years of .NET development experience
Finance/FinTech background — hands-on AP, AR, Payments, or financial software experience strongly preferred
Strong SQL Server database design and optimization skills
Self-motivated with ability to navigate complex, large codebases
Strong problem-solving skills for debugging and optimizing enterprise applications
Excellent communication skills for collaborating with business stakeholders and QA teams
Experience with legacy modernization and gradual migration strategies