Freelance Full Stack Web Developer Jobs in Roseland, NJ

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 QuickBooks, NetSuite, 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.

Responsibilities:

• 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 QuickBooks, NetSuite, 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, standouts, and retrospectives
• Serve as a technical resource and mentor for mid-level and junior developers on the team

MUST HAVE: Required Technical Stack / Hands-On Experience

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.

Qualifications:

• 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 requirements
• Familiarity with Git and modern version control workflows
• Strong problem-solving skills, attention to detail, and the ability to own projects end-to-end with minimal oversight
• Excellent communication and collaboration skills — you can speak to both engineers and finance stakeholders clearly

Preferred:

• Experience working on supply chain, logistics, inventory, or operational platforms
• Prior experience integrating with accounting platforms such as QuickBooks, NetSuite, SAP, or Microsoft Dynamics
• Background working in or alongside finance, accounting, or operations teams in a product or consulting capacity
• Experience in a startup or high-growth environment where ownership and adaptability are essential

Please Note: Chefman is unable to provide visa sponsorship for this position. Candidates must be legally authorized to work in the United States on a permanent and ongoing basis without the need for current or future employer-sponsored visa support, including H-1B, OPT, STEM OPT, or any other work authorization requiring sponsorship. Applications from candidates requiring sponsorship now or in the future will not be considered.