We are a vibrant and intensely mission-driven team in San Francisco, comprising members from MIT, Harvard Medical School, Roche, ETH, and Dana-Farber.

We value speed and rigor, coupled with excitement, drive, and a strong work ethic. In an early-stage environment, we value people who can bring clarity to open-ended problems, take ownership of the next steps, and follow through with energy.

Capable Labs is a place for ambitious, high-integrity people who want to become dramatically better. You will be surrounded by people who care intensely about the work, get close feedback from the people making scientific and company-defining decisions, and have room to own increasingly important problems.

We believe excellent work should be met with meaningful reward, ownership, and trust. Responsibility is earned through contribution, not title alone: anyone who demonstrates the judgment, rigor, and follow-through to move important work forward can earn meaningful scope.

About the Role

You will run peptide-synthesis workflows on a dedicated night-shift schedule so compounds are ready for characterization, biological testing, or handoff the next day. You will own careful overnight execution, troubleshoot issues independently, maintain complete records, and give the day team a clear account of every batch, result, and open question.

Responsibilities

Execute overnight peptide synthesis workflows, including resin loading, coupling and deprotection cycles, cleavage, purification, characterization, and sample preparation.

Run microwave-assisted solid-phase peptide synthesis and support routine synthesizer maintenance during night-shift hours.

Troubleshoot failed couplings, low crude purity, side products, cleavage issues, and instrument downtime.

Purify and characterize candidates using analytical HPLC, prep HPLC, LC-MS, and related methods.

Record identity, purity, yield, analytical traces, and batch-level quality-control data for morning handoff.

Prepare compounds for in vitro and in vivo testing and maintain accurate experimental records.

Provide clear handoffs covering completed work, failures, results, sample locations, risks, and follow-up actions.

Ideal Qualifications

Able and willing to work the designated night-shift schedule reliably and operate independently when needed.

Hands-on chemistry or biochemistry laboratory experience and strong experimental discipline.

Interest in owning the overnight synthesis workflow from reaction execution through purification, characterization, documentation, and sample handoff.

A fast, rigorous, and safety-conscious approach to laboratory work.

Proactive judgment when an instrument breaks, a synthesis fails, data look unusual, or a handoff needs clarification.

Experience with solid-phase peptide synthesis, HPLC, prep HPLC, or LC-MS is valuable, but we can teach specific workflows.

Pay & Benefits

Compensation and equity will depend on the skills, experience, and scope of impact you bring. We are open to a conversation based on the scope and impact you could bring.

$500+ monthly wellness budget for training, supplements, coaching, recovery, or other tools that help you perform at your best.

Healthcare: We offer a broad range of medical, dental, and vision coverage options, with Capable covering 100% of the base policy.

You will also have access to HSA, FSA, and 401K plans.

Healthy vegetarian dinners with the team are provided daily.

We support visa sponsorship where appropriate, including O-1, H-1B, J-1, TN, and other employment-based pathways. Our team is already international, with members from Canada, Pakistan, Germany, Austria, Switzerland, China, India, and the United States.

Application Process

Our process is fast, transparent, and personal. We care about getting to know the person behind the application.

Initial application

First phone screen

Second phone screen

In-person on site work trial in San Francisco: designed to give both sides a realistic sense of working together. Get to know the founding team!

Apply Today

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