Senior Software Engineer

This position is on-site in Teaneck, NJ.

About the role

Interstate Waste Services (IWS) is the most progressive and innovative provider of solid waste and recycling services in the greater New York, New Jersey, and Connecticut markets, with a rail-served landfill in Ohio. IWS is committed to delivering high-quality waste, recycling, and environmental services while prioritizing the safety of our employees, customers, and communities. We serve a diverse range of industrial, medical, and commercial/residential customers. Founded in 1998, IWS has grown through acquisitions, many of which were family-owned businesses that remain part of our team today. We combine the resources of a large company with the values and care of a family-run business.

Responsibilities

• Design, develop, test, implement, and maintain business-critical applications and workflows using Microsoft .NET technologies.
• Analyze user and business requirements to define technical specifications and scalable solution designs.
• Translate functional requirements into intuitive, efficient, and maintainable application workflows.
• Develop and maintain RESTful APIs and lead integrations across internal and SaaS platforms.
• Write, optimize, and maintain SQL queries, stored procedures, and relational database structures.
• Create and maintain system design documentation, technical specifications, and architectural diagrams.
• Review peer code, architecture, and documentation to ensure quality and adherence to standards.
• Contribute to development standards including source control, CI/CD, deployment, and environment management.
• Support performance tuning and scalability initiatives for high-concurrency applications.
• Assist in maintaining technical artifacts such as data dictionaries and application catalogs.
• Collaborate cross-functionally with IT and business stakeholders to deliver effective solutions.
• Monitor emerging technologies and recommend improvements to enhance performance and usability.
• Maintain detailed documentation and prepare release notes for enhancements.
• Participate in critical decisions related to architecture, integrations, and software selection.

Requirements

• Minimum five years of experience in a developer role in a full-stack environment.
• Robust experience with C# programming and .NET 8+.
• Knowledge of SQL queries, SQL Server, and relational database technology.
• Experience with REST API development, integration knowledge, and middleware integration expertise.
• Experience developing critical applications with large concurrent user bases from a performance and scalability standpoint.
• Experience with Azure cloud services.
• Experience with the analysis, design, development, testing, and implementation of enterprise-scale applications.
• Ability to handle change, multitask, and keep up with a fast-paced and consistently growing environment.
• Strong problem-solving and creative skills, with the ability to exercise sound judgment and make decisions based on accurate and timely analyses.
• Requirement gathering and documentation experience.
• Ability to work closely with business stakeholders to solution requirements.
• Effective written and verbal communication.

Preferred Qualifications

• Experience with Blazor.
• Experience with CI/CD pipelines and Azure DevOps.
• Experience with finance and payment solutions.
• Experience with mobile app development.
• Experience developing or maintaining customer-facing hybrid web applications.

Pay

Salary range: $125,000 – $160,000 per year.