The Pet Autotransporter protein was engineered and recently proposed as recombinant protein production (RPP) system. This system allows targeting the protein of interest in the culture supernatant fraction. The reduction of diversity and quantity of process impurities and size and number of downstream steps required, increase the overall process robustness and speed-up the process development time for RPP. In the context of this study the platform was investigated for the production of a “difficult” E.coli protein with commercial relevance, C1275. Pet autotransporter was suitable for the production and one step-purification of a protein with comparable purity, thermal stability and immunogenicity to that produced using conventional technology. Additionally, the autotransporter platform was tested for the first time in scaled-up production conditions. The system was compatible with fermentation and the scaled-up conditions resulted in high yield of antigen production even though a further system optimization would be required for a one step-purification process.