Diesel Retrofit Designer

Most days tend to involve a blend of design and analysis work, retrofit specifications, and coordination with installation and verification partners — sizing aftertreatment components, modeling thermal and flow performance, partnering with installers, and reviewing compliance test data. You'll often spend part of the time on regulatory compliance work — the certification and verification testing that retrofits require.

The harder part is often the technical complexity of retrofit work — installing new systems on legacy equipment introduces space, thermal, and integration challenges that new-equipment designers don't face. You'll typically coordinate with installers, fleet operators, and regulators, where compliance and operational viability both have to land.

People who tend to thrive here are technically rigorous, comfortable with the constraints of retrofit work, and patient with regulatory verification cycles. The trade-off is the regulatory complexity and the cumulative weight of work where compliance and equipment durability both matter. If you find satisfaction in bringing legacy diesel into the next emissions era, the role can be a quietly meaningful niche in environmental engineering.