Associate Scientist/Scientist I, Bioconjugation - 1-Year Contract Position

About Hexagon Bio: Hexagon Bio leverages a genomics-based platform and understanding of natural product evolution to develop next-generation ADCs with novel payloads for cancer. We use data science, genomics, machine learning, synthetic biology, and automation to discover potent, evolutionarily refined small molecules from microbial genomes, and apply medicinal chemistry to optimize these molecules into truly transformative medicines. Location: Menlo Park, CA Job description: Hexagon Bio is seeking a highly motivated Associate Scientist/Scientist I to join our Bioconjugation team. This laboratory-based role focuses on ADC conjugation, purification, and analytical characterization/QC to support our expanding ADC pipeline. You will work closely with biochemists, medicinal chemists, and cell biologists to generate high-quality materials that enable in vitro and in vivo studies of novel natural-product–based payloads. We are looking for a team member who excels at hands-on bench work, enjoys solving technical problems, and thrives in a fast-paced startup environment. This is a 100% on-site lab-based role. Key Responsibilities: Perform antibody-drug conjugation at milligram scale using a variety of linker chemistries and conjugation strategies Purification of conjugated antibodies via FPLC-based purifications (SEC, IEX, HIC and other chromatography-based methods) and diafiltration. Optimize reaction conditions, monitor conjugation efficiency, and ensure consistency across production batches. Execute analytical assays to assess ADC properties and quality, including: SEC, HIC, IEX, RP-HPLC, UV-Vis, LC-MS DAR determination, and endotoxin. Collaborate with cell biology teams to ensure materials meet criteria for potency assays, in vitro MoA studies, and in vivo PK/efficacy/tolerability experiments. Maintain detailed electronic laboratory notebooks. Comply with safety policies and best laboratory practices. Contribute to a collaborative, transparent, and mission-driven team culture. Requirements: Ph.D. + 0 to 2 years of relevant experience, Master’s Degree + 3 to 5 years of relevant experience or Bachelor’s Degree + 6+ years of relevant experience in Biochemistry, Chemistry, Structural Biology, or related discipline with hands-on experience, preferably in protein sciences or related area. Direct experience with ADC conjugation, protein purification, or analytical characterization is strongly preferred. Hands-on experience with HPLC based analytical methods such as SEC, IEX, HIC, RP-HPLC, and UV-Vis. Strong analytical and troubleshooting abilities. Excellent organization, communication, and documentation skills. Curiosity, initiative, and the ability to excel in a dynamic startup environment. What We Offer: A flexible and dynamic work environment where you pave your own path, Hexagon cultivates employees' unique strengths at all levels and provides mobility across departments. “All Hands Meetings” provide an opportunity to share company and team updates. These meetings are rooted in our value of transparency. They are designed to foster a culture of collaboration, curiosity, and open communication. Rapid career advancement for driven performers. Access to scientific conferences throughout the year. A range of amenities, courtesy of the Menlo Park Labs business park, including shuttle, gym, rock-climbing wall, pool, sauna, sports courts, cafe, bike lockers, and free EV charging stations. Opportunities to engage with the Hexagon community through team-building events like our Hexagon Happy Hours and holiday parties. Additional Information: The salary range is dependent on the level that is hired. The salary range for this position is $110,000 - $140,000. Our salary ranges are determined by role, level, and location. The range displayed on each job posting reflects the minimum and maximum target for new hire salaries for the position across California locations. Within the range, individual pay is determined by work location and additional