Mechanical Engineer

About this role

We’re ALTEN Technology USA, an engineering company helping clients bring groundbreaking ideas to life—from advancing space exploration and life-saving medical devices to building autonomous electric vehicles. With 3,000+ experts across North America, we partner with leading companies in aerospace, medical devices, robotics, automotive, commercial vehicles, EVs, rail, and more.

As part of the global ALTEN Group—57,000+ engineers in 30 countries—we deliver across the entire product development cycle, from consulting to full project outsourcing.

When you join ALTEN Technology USA, you’ll collaborate on some of the world’s toughest engineering challenges, supported by mentorship, career growth opportunities, and comprehensive benefits. We take pride in fostering a culture where employees feel valued, supported, and inspired to grow.

Position Summary

We are seeking a highly motivated Engineer to support the development, validation, and performance optimization of diesel engine aftertreatment systems. This individual will play a key role in testing, analyzing, troubleshooting, and improving emissions control technologies including SCR, DPF, DOC, and DEF/urea systems.

The ideal candidate combines strong technical knowledge of diesel emissions and aftertreatment systems with hands-on experience in testing, validation, data analysis, and root cause investigation. This role requires close collaboration with cross-functional engineering teams, suppliers, and testing organizations to ensure system performance and compliance requirements are achieved.

Key Responsibilities

* Support development and validation of diesel engine aftertreatment systems and emissions control technologies. * Evaluate performance of SCR, DPF, DOC, DEF, and related emissions reduction systems. * Conduct testing and validation activities on engines, vehicles, and laboratory test setups. * Analyze test data and identify performance issues, trends, and optimization opportunities. * Perform root cause analysis and lead troubleshooting efforts related to emissions system performance. * Investigate failures and develop corrective actions through structured problem-solving methodologies. * Work with calibration, controls, validation, and product engineering teams to improve system performance. * Collect and analyze signals from vehicle and engine testing activities. * Support emissions compliance and performance verification initiatives. * Interface with suppliers and internal stakeholders to resolve technical issues and drive improvements. * Prepare technical reports and communicate findings to engineering and leadership teams.

Required Qualifications

* Bachelor's degree in Mechanical Engineering, Chemical Engineering, Automotive Engineering, or related field. * 3+ years of experience in diesel engines, emissions systems, aftertreatment systems, or powertrain validation. * Experience with one or more of the following: * SCR (Selective Catalytic Reduction) * DPF (Diesel Particulate Filter) * DOC (Diesel Oxidation Catalyst) * DEF/Urea systems * Diesel emissions systems * Strong troubleshooting and root cause analysis skills. * Experience analyzing engineering test data and developing technical recommendations. * Familiarity with testing and validation processes. * Strong communication and cross-functional collaboration skills.

Preferred Qualifications

* Experience with calibration tools such as ETAS INCA or CANape. * Experience with CAN-based tools such as CANalyzer, CANoe, Vehicle Spy, or similar. * Diesel engine performance, combustion, or aftertreatment development experience. * Experience supporting engine, vehicle, or emissions testing programs. * Knowledge of catalyst technologies, coatings, substrates, chemical reactions, or emissions reduction strategies. * Experience working with suppliers and external testing partners. * Background in emissions compliance, certification, or regulatory validation.

Ideal Candidate Backgrounds

Candidates with experience in the following types of roles are highly encouraged to apply:

Aftertreatment Engineer Emissions Engineer Emissions Calibration Engineer Diesel Validation Engineer Powertrain Validation Engineer Engine Test Engineer Performance Engineer (Diesel/Aftertreatment) SCR Systems Engineer Emissions Test Engineer

Salary Range: $75,000-78,000

The actual salary offered is dependent on various factors including, but not limited to, location, the candidate’s combination of job-related knowledge, qualifications, skills, education, training, and experience 

All qualified applicants will receive consideration for employment and will not be discriminated against on the basis of race, color, religion, sex, sexual orientation, gender identity, national origin, disability, protected veteran status, age, genetic information, or pregnancy.

Please beware of job seeker scams and see this important notice on our careers page for more information about our recruiting process.

Compliance Notice: Alten USA is a federal contractor subject to the requirements of the Vietnam Era Veterans’ Readjustment Assistance Act (VEVRAA) and Executive Order 11246. We are an Equal Opportunity Employer and consider all qualified applicants without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or veteran status.

Drug Screening Requirement: As a federal contractor, Alten USA maintains a drug-free workplace. All candidates selected for employment will be required to successfully complete a pre-employment drug screening as a condition of hire.