Senior Software Engineer

onPhase Software, United States

What our tracking knows about this posting

Published on 28 September 2026 · first appeared in our records on 29 September 2026.

Stable posting: first seen on 29 September 2026, with no abnormal reposting.

This posting shows no salary, while 40% of open postings in the same sector in this country (United States) do.

View the posting at the employer Have my resume reviewed for this job
About the Role: 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 Technical Skills: Core .NET Technologies • 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 Web Technologies • 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 Database & Data Technologies • 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 Architecture & Integration • 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 DevOps & Infrastructure • 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 Preferred Qualifications: • 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 Originally posted on Himalayas

Other recent postings in the same sector