Engineering Systems Inc.

Engineering Systems Inc., doing business as E S I, is a specialized engineering and forensic analysis firm based in Aurora, Illinois that provides expert witness services, litigative consulting, and technical engineering analysis to federal agencies exclusively as a prime contractor, competing on technical qualifications rather than set-asides. The vendor has secured 107 prime federal contract awards totaling $10.4 million in combined potential value since federal registration in 2001, with $9.4 million obligated across the portfolio (91% of potential value). E S I operates facilities in Aurora, Illinois and Omaha, Nebraska and performs all contract work directly without subcontractor involvement.

Customer concentration is heavily skewed toward the Department of Justice ecosystem. The top five agencies account for 81% of awards by count and 84% of combined potential value, dominated by two DOJ components: the Civil Division (39 awards, $5.9 million) and the U.S. Attorney's Offices (35 awards, $1.1 million). The Environment and Natural Resources Division contributes one high-value award ($709 thousand), the Consumer Product Safety Commission two awards ($595 thousand combined), and the Department of the Treasury's Internal Revenue Service one award ($443 thousand). Secondary customers include the National Transportation Safety Board, Federal Railroad Administration, and U.S. Coast Guard, each placing individual specialty engagements. This concentration reflects E S I's core market position as a litigation-support vendor for DOJ litigative matters rather than a diversified federal contractor.

E S I's service portfolio is tightly anchored to expert witness testimony and forensic consulting. Across the award portfolio, 83 purchase orders carry the PSC code for Support-Professional Expert Witness services, with 62 awards falling under the NAICS category All Other Legal Services and 22 under Engineering Services. Representative work includes a $1.284 million time-and-materials expert witness services order from the DOJ Civil Division (awarded February 6, 2025, performance through January 31, 2029), a $709 thousand expert witness order from the Environment and Natural Resources Division (awarded February 17, 2022, performance through February 1, 2029), a $289.9 thousand Consumer Product Safety Commission order for residential elevator expert services (awarded January 21, 2022, completion January 20, 2025), a $141.8 thousand Federal Railroad Administration order for heat-transfer analysis of rail car fire response (awarded September 3, 2021, completed March 31, 2023), and a $59.8 thousand U.S. Coast Guard biomechanics consultation order for maritime litigation support (awarded November 14, 2023). Smaller awards include $12.5 thousand freight car axle and wheel set bearing failure analyses from the National Transportation Safety Board (August 2023 and July 2023 respectively). Work is predominantly performed in Aurora, Illinois with specialized technical analysis routed through the Omaha, Nebraska facility.

Activity has remained steady with year-over-year fluctuation: seven awards in 2022, nine in 2023, eight in 2024, ten in 2025, and two through June 2026. Eleven awards with combined potential value of $960 thousand reach ultimate completion within the next twenty-four months, representing recompete exposure concentrated in DOJ Civil Division and U.S. Attorney's Offices engagements. The vendor competes exclusively in full-and-open competitive procurements with no set-aside designation across the entire portfolio, positioning it as a specialized-expertise player rather than an SBA-eligible firm. No parent contract vehicles, GWACs, BPAs, or IDIQs appear in the award footprint; all work flows through individual purchase orders negotiated directly with customer agencies. E S I has maintained federal registration since 2001 but has concentrated federal business development activity on DOJ litigation support since roughly 2021, when the award frequency and dollar value of the current portfolio began.