Small Animal Reproductive Specialist
Colossal Biosciences
We are seeking a highly motivated Specialist to support our rodent and small-mammal assisted reproduction and colony-generation and maintenance programs. This role is essential to enabling advanced research through high-quality embryo transfer, reproductive procedures, and embryology support services. The ideal candidate is detail-oriented, skilled in microsurgical or micro-manipulation techniques, and comfortable working in a fast-paced research environment.
**This position will be based in Dallas, TX** Relocation assistance is available.
Duties and Responsibilities:
Embryo Transfer & Microsurgical Procedures
- Plan, schedule, and execute embryo transfer procedures in rodents and other small mammals.
- Perform hormone injections, oocyte and embryo recovery, and vasectomy.
- Conduct tissue collection and sample processing for downstream analysis.
Post-Procedure Animal Care & Well-Being
- Provide post-surgical monitoring, care, and documentation following institutional and regulatory guidelines.
- Assist with validation of embryo transfer outcomes, including pregnancy checks, sample collection, and data reporting.
Laboratory Operations & Record Management
- Maintain accurate, timely records of procedures, sample inventory, animal IDs, outcomes, and quality-control data.
- Prepare reagents, materials, and surgical setups to support daily embryology workflows.
- Uphold compliance with IACUC, animal welfare standards, and laboratory safety procedures.
Training & Collaboration
- Provide hands-on training and technical support to internal researchers and collaborating teams.
- Communicate effectively with project managers and investigators to ensure aligned timelines and experimental plans.
- Contribute to optimization of SOPs, troubleshooting, and continuous improvement of embryology techniques.
Other tasks as assigned may include lab and husbandry support.
Required Skills and Abilities:
- Hands-on experience with rodent handling, anesthesia, surgical procedures, or microsurgical techniques.
- Experience with embryo transfer, reproductive technologies and rodent colony management
- Demonstrated ability to follow detailed protocols and maintain precise laboratory documentation.
- Strong understanding of laboratory safety, sterile techniques, and animal welfare guidelines.
- Understanding of colony management, pedigree, and mate selection paradigms.
- Previous work in an academic, biotech, or vivarium environment supporting research teams.
Preferred
- Experience with IVF/ICSI.
- Familiarity with oocyte or embryo collection, injections, cryopreservation, or microinjection tools.
Required Education and Experience:
- Bachelor’s degree in Biology, Reproductive Biology, Animal Science, Biotechnology, or a related field.
- At least 2 years of hands-on experience with applied small animal reproduction.
Core Competencies
- Exceptional attention to detail and manual dexterity.
- Ability to work independently while maintaining strong team communication.
- Strong problem-solving skills and comfort with learning new techniques.
- Commitment to high standards of animal care and scientific quality.
Work Environment
- Work is performed in a research laboratory and animal facility.
- Position requires routine handling of rodents and small mammals, use of anesthetics, and surgical tools.
- Occasional weekend or holiday work may be required depending on experimental timelines.
What Colossal Offers Full-Time Employees:
- Medical, dental, and vision coverage
- Excellent paid time off and company holidays so you can rest and recharge
- Flexible spending accounts (FSA)
- Company matched 401k retirement plan
- Paid parental leave at 100% salary for up to 12 weeks
- Education reimbursement
- An opportunity to help us return the Earth to a healthier state
The team at Colossal is committed, colorful, passionate, intelligent, collaborative, creative, experienced, scientific and world-class. That sounds like a lot to fit into one building. That’s why we are spread out in several locations that include laboratories, test facilities, academic institutions, libraries and offices.
Through it all, however, we maintain a culture of positivity, hope, happiness and belief that we’re doing something big. Something Colossal.
Colossal is proud to be an equal employment opportunity workplace. We welcome people from all backgrounds as well as celebrate and support diversity. We are committed to providing an inclusive environment of mutual respect that is free from discrimination and harassment so everyone can thrive.
Search Firm Representatives: Colossal does not accept unsolicited assistance from search firms. No fees will be paid for a hired candidate where no pre-existing agreement is in place. We handle most recruitment in-house.
Colossal is proud to be named a Best Place to Work by BuiltIn for 4 years in a row across multiple categories in 2023, 2024, 2025, and 2026:
- #1 on the 50 Best Startups to Work For in Dallas in 2023!
- 100 Best Midsize Places to Work in Dallas in 2024 & 2025
- 100 Best Places to Work in Dallas, TX (All Size Employers) in 2024, 2025, and 2026.
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Most Loved Workplace Certification Page - Proud to be certified as a most loved workplace including: most loved CEO, most loved workplaces for LGBTQ+, most loved workplaces for women, and most loved workplaces for young professionals.
Newsweek's Most Loved Workplaces 2024 Award List - Excited to be amongst the winners of Newsweek's 2024 Most Loved Workplaces!