Internal Applications Developer

The Consortium of Jewish Day Schools; New York (NY); On-site; USD 90,000 - 130,000; Full time

Benefits offered by this job

Competitive salary

Comprehensive benefits package

403(b) retirement plan with 5% company

Tuition Reimbursement

Lunch provided

Professional Development

Year-round school schedule

Job summary

Magen David Yeshivah in Brooklyn, NY seeks an Internal Applications Developer to build and maintain internal software supporting HR, payroll, finance, and admin operations. Full-time, on-site for 3-4 months with potential hybrid after that.

You will design custom web apps, integrate data across SIS, ADP, and NetSuite, and focus on data accuracy, security, and reliability. Reports to the HR Director with a dotted line to the CIO; work aligns with the Business Office schedule year-round.

Qualifications

• 2-3 years in an office/business environment building applications.
• Strong experience with C# and the .NET platform (.NET Core / .NET 8).
• Experience with ASP.NET Core (MVC, Razor Pages, Web API) and SQL Server.
• Ability to integrate REST APIs and third-party systems.

Responsibilities

• Design, prototype, and build internal web applications and tools.
• Create secure API integrations between SIS, ADP, NetSuite and internal systems.
• Ensure data validation, accuracy, and auditability across platforms.
• Maintain databases, write efficient queries, and map data across systems.

Skills

Attention to detail

Team collaboration

Requirements gathering

Explain technical concepts

Education

BS in Computer Science or related field

Tools

C# / .NET

ASP.NET Core

Microsoft SQL Server / T-SQL

REST APIs / JSON

HTML / CSS / JavaScript

IIS / Windows Server

Git

Entity Framework Core

Job description

Full-time · On-site Brooklyn, NY for the first 3-4 months with an opportunity to be hybrid after that. Reports to the HR Director with a dotted line reporting to the Chief Information Officer.

We are seeking a skilled, detail-oriented Internal Applications Developer to help build and maintain the internal software that supports our organization's business, HR, payroll, finance, and administrative operations.

In this role, you will design and develop custom web applications, internal tools, and reliable data integrations. A primary focus will be connecting our internal budget, financial and employee systems with core enterprise platforms, including ADP Payroll and NetSuite Financials.

The ideal candidate has a strong foundation in software development and systems logic, enjoys building intuitive tools for internal users, and cares deeply about data correctness, security, and system reliability. The position works the same schedule as the Business Office staff working 12 months a year and through the summer months.

Key Responsibilities

• Custom Application Development: Design, prototype, and build homegrown web applications and internal utilities to streamline HR, payroll, finance, and business office workflows.
• API Integration & Architecture: Build, test, and maintain secure, reliable API integrations between our custom Student Information System (SIS), ADP, NetSuite, and other internal systems.
• Data Validation & Reliability: Develop automated validation processes to help ensure employee, payroll, and financial data syncs accurately without duplicate entries, missing fields, or data loss.
• Database Management: Write efficient queries, manage database schemas, and map data across multiple systems.
• User-Centric Tooling: Work closely with HR, finance, and administrative staff to translate business requirements into clean, practical dashboards, forms, reports, and workflows.
• Security & Auditability: Help ensure internal applications include appropriate permissions, logging, and audit trails for sensitive HR, payroll, budget, financial, and employee systems.
• Support & Maintenance: Troubleshoot bugs, investigate data issues, improve existing tools, and provide technical support to internal users.

Qualifications & Skills

• 2-3 years’ experience working in a business/office environment in an application development role
• Strong experience with C# and the .NET platform (.NET Core / .NET 8), and modern web application development.
• Experience building web applications and services with ASP.NET Core (MVC, Razor Pages, or Web API).
• Experience working with relational databases, especially Microsoft SQL Server, including writing efficient T-SQL queries and working with stored procedures.
• Experience working with REST APIs, webhooks, JSON data structures, and third-party integrations.
• Working knowledge of front-end web fundamentals (HTML, CSS, and JavaScript) for building clean, usable interfaces.
• Understanding of data integrity, validation, error handling, and reliable system design.
• Ability to collaborate with nontechnical stakeholders, gather requirements, and explain technical concepts clearly.
• Strong attention to detail, especially when working with sensitive or business-critical data.
• B.S. in Computer Science or a related field, or equivalent practical experience in software development.

Preferred Qualifications

• Experience with ADP, NetSuite, payroll systems, ERP systems, HR systems, or school administration software.
• Experience building internal business applications, dashboards, approval workflows, or reporting tools.
• Experience hosting and deploying applications on IIS / Windows Server, and familiarity with Git for version control.
• Familiarity with data-access approaches such as ADO.NET or Entity Framework Core.
• Experience modernizing or migrating older .NET applications (for example, Web Forms to ASP.NET Core) — a plus, as we are actively modernizing our systems.
• Familiarity with authentication, role-based permissions, audit logs, and data privacy best practices.
• Experience with cloud platforms, scheduled jobs, background workers, or data pipeline tools.

We are an Equal Employment Opportunity employer offering:

• A competitive salary will be based on education and experience
• Comprehensive benefits package
• A 403(b) retirement plan with a 5% company match
• Tuition Reimbursement
• School paid lunch.
• Continuous school-wide Professional Development
• The school year is consistent with the Jewish calendar and closed during the summer.

Now is an exciting time to join us!

About the School:

Established in 1946, the mission of Magen David Yeshivah is to ensure and globally support the continuity of Sephardic communities through education. Its vision is to develop a new, globally recognized center of excellence that prepares students to excel academically, graduate college as well as professional graduate schools, and apply their unique talents in the world to create economically independent and personally fulfilling lives.