Note: The job is a remote job and is open to candidates in USA. onPhase is seeking an experienced Senior Software Engineer to join their software development team working on mission-critical financial technology applications. The role involves developing and maintaining large-scale systems for invoice processing and accounts payable, with a strong focus on financial domain processes.
Responsibilities
- Developing and maintaining large-scale invoice processing, accounts payable, and document management systems serving enterprise clients across multiple industries
Skills
- Experienced Senior Software Engineer
- Hands-on experience in financial or B2B software
- Strong understanding of AP/AR workflows, Payments systems, and broader Finance domain processes
- 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
- 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
- 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
Company Overview
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