Senior Full-Stack Software Developer – Finance & ERP Integration Mahwah

Senior Full-Stack Software Developer – Finance & ERP Integration

Mahwah, New Jersey

This is a fully onsite position based in Mahwah, New Jersey. Remote and hybrid work arrangements are not available. Candidates must be able and willing to work in the Mahwah office five days per week.

About SAYDAR

SAYDAR is entering an exciting stage of growth, and we are looking for a Senior Full-Stack Software Developer to help expand the financial and operational capabilities of our platform. This is an opportunity to join a highly motivated engineering team with a strong, well-maintained codebase, reliable infrastructure, and a solid technical foundation already in place. You will focus on building scalable solutions that connect supply chain operations with financial workflows, helping accounting and operations teams manage complex processes more efficiently within one platform.

Working across the full technology stack, you will design and develop financial modules, reporting tools, dashboards, APIs, and integrations using ASP.NET, .NET Core, C#, SQL, Entity Framework, Angular, and NGRX. You will also help connect SAYDAR with accounting and ERP platforms such as Quick Books, Net Suite, SAP, and Microsoft Dynamics. You will work closely with engineering, finance, operations, product, and leadership to translate complex business and accounting requirements into practical technical solutions.

We are looking for someone who enjoys owning projects from database to user interface, solving complex financial workflow challenges, mentoring other developers, and building systems designed to support continued growth.

• Design, develop, and maintain full-stack web applications using ASP.NET, .NET Core, C#, SQL, and Entity Framework across SAYDAR's supply chain and financial modules
• Architect and build ERP‑adjacent features that enable accounting teams to manage invoicing, cost tracking, financial reconciliation, and reporting directly within the SAYDAR platform
• Develop and maintain RESTful APIs and backend services that power both internal operations and external integrations, including accounting systems such as Quick Books, Net Suite, or SAP
• Build and enhance responsive front‑end interfaces using Angular and NGRX, with a focus on financial dashboards, reporting tools, and operational workflows
• Integrate front‑end components with backend APIs to deliver seamless, intuitive experiences for finance and operations users
• Translate complex financial and accounting requirements into scalable, maintainable technical solutions
• Collaborate with cross‑functional teams including finance, operations, and product to define requirements, architecture, and technical solutions
• Conduct code reviews and contribute to raising development standards and best practices across the engineering team
• Troubleshoot and resolve issues across the full application stack including database, API, and UI layers
• Participate in Agile development processes including sprint planning, stand‑ups, and retrospectives
• Serve as a technical resource and mentor for mid‑level and junior developers on the team

This role requires strong hands‑on experience with the existing technology stack:

• Angular for frontend development
• NGRX for state management
• C#/.NET for backend services
• SignalR or similar realtime communication frameworks

• Must be able to work fully onsite in Mahwah, New Jersey, five days per week.
• This position is not remote or hybrid.
• 7+ years of professional software development experience with strong hands‑on expertise in full‑stack or backend development
• Demonstrated experience building software tools, modules, or platforms used by finance or accounting departments — invoicing, cost management, reconciliation, financial reporting, or ERP integration
• Strong proficiency in ASP.NET, .NET Core, C#, SQL, and Entity Framework
• Experience building and consuming RESTful APIs, including integrations with financial or ERP systems
• Experience developing front‑end applications using Angular and NGRX
• Solid understanding of financial workflows, accounting principles, and how they translate into software…