Data Engineer

a { text-decoration: none; color: #464feb; } tr th, tr td { border: 1px solid #e6e6e6; } tr th { background-color: #f5f5f5; } Data Engineer Burnham, IL (100% onsite) Contract/Direct Hire We're looking for a Data Engineer who can step into an established environment and quickly take ownership of critical data workflows. This role supports and enhances existing ETL processes, APIs, and SQL workloads in an on prem environment. Strong C# and SQL expertise are essential, along with the ability to work through legacy systems with limited documentation. Key Responsibilities Support, maintain, and extend ETL processes by understanding existing logic and data flows Develop and enhance C# scripts that support ETL operations Design and maintain C# APIs used for data integration and downstream systems Optimize SQL Server performance , including: Stored procedures omplex queries Indexing and performance tuning Work directly with on prem SQL Server environments Maintain and improve SQL stored procedures Help stabilize and document legacy components where knowledge is limited Required Skills & Experience Strong professional experience with C# Scripting to support ETL API development Deep understanding of ETL concepts and data pipelines Advanced SQL Server experience: Writing and optimizing stored procedures Query performance tuning On prem SQL environments Ability to work independently and ramp up quickly in undocumented or legacy systems Nice to Have PHP experience (strong plus)