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Confirmed on the employer's own hiring board on Nov 8, 2026. First seen by Alion on Nov 6, 2026. Diversified Services Network scores A on the Alion truth index.

Overview
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Diversified Services Network, known as DSN, is an IT consulting and staffing firm based in Naperville, Illinois, that serves government agencies and private companies. Founded in 1989, it offers IT consulting, software development and integration, independent verification and validation, project management and Medicaid, SNAP and TANF policy and staffing services, with offices in Chicago, Peoria, Dallas and Broomfield. It places contract engineers and IT professionals with clients, hiring manufacturing, test and quality engineers, project and program managers, product owners, software engineers and technicians.

Aftertreatment Systems Development Engineer

Mossville, IL

Diversified Services Network, Inc. (DSN) is seeking a full-time Aftertreatment Systems Development Engineer to join our team in Mossville, IL. We offer full benefits, PTO, 401k, and more! If you're looking to grow your career within an extremely reputable, stable Fortune 100 company - let's talk!

Position Overview

The Aftertreatment Systems Development Engineer advances the development and application of aftertreatment systems for diesel engine programs. This role combines catalyst simulation, system analysis, and validation testing to guide product development decisions.

Key Responsibilities

  • Perform catalyst performance modeling and sizing for aftertreatment applications
  • Evaluate catalyst sizing alternatives and aftertreatment capability across a range of operating conditions
  • Analyze test-cell andfield data to assess aftertreatment performance
  • Combine simulation results with experimental data to identify performance gaps and recommend technical solutions
  • Support catalyst and aftertreatment system selection, sizing, and application decisions
  • Communicate results and issues to team members, suppliers, and engine system development partners

Requirements

Qualifications

Required

  • Bachelor's degree in Engineering, Materials Science, Chemistry, or a related field from an accredited program, and 2-4 years of engineering experience
  • Experience with engine or aftertreatment testing
  • Knowledge of catalyst technology
  • Background in product design and development
  • Strong analytical thinking and problem-solving skills
  • Excellent verbal and written communication skills, including the ability to convey technical information to team members, other departments, customers, and suppliers
  • Ability to manage multiple priorities and adapt to changing demands
  • Quick learner

Preferred

  • Proficiency with data analysis tools
  • Experience with engine and/or aftertreatment performance data reduction and analysis
  • Strong understanding of engine and aftertreatment systems
  • Ability to draw conclusions from analysis and make sound technical decisions
  • Excellent interpersonal and collaboration skills
  • Self-starter with strong technical leadership skills

Benefits

  • 401(k)
  • Dental insurance
  • Vision Insurance
  • Disability insurance
  • Employee assistance program
  • Health insurance
  • Health savings account
  • Life insurance
  • Paid time off
  • Paid Holidays

Please follow the link to our website for a list of job openings in Engineering, IT, Project Management, and more! https://www.dsnworldwide.com

Salary expectations: 70,000-78,000 per annual

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