Senior Fullstack Engineer – Frontend Leaning, Handshake AI

Handshake; San Francisco (CA); On-site; USD 150,000 - 230,000; Full time

Job summary

Handshake is looking for a Senior Fullstack Engineer specializing in frontend development to join their team in San Francisco. This role involves working closely with product and design teams to build high-impact data products and features that enhance AI research workflows. The candidate will be responsible for leading projects, mentoring junior engineers, and ensuring the highest quality in code and experiences.

Benefits

Equity and ownership in a fast-growing company.

16 weeks of paid parental leave.

Comprehensive medical, dental, and vision policies.

Generous learning & development opportunities.

Monthly internet stipend and a MacBook.

401k match.

Flexible time off policy.

Team outings to stay connected.

Referral bonus.

Free lunch provided 5x a week.

Qualifications

• Strong experience as a fullstack engineer with a focus on frontend development.
• Experience with ReactJS, Typescript, and PostgreSQL.
• Ability to lead projects and mentor junior engineers.

Responsibilities

• Collaborate on cross-functional teams with designers and product managers.
• Lead projects and maintain quality standards in code reviews.
• Provide mentorship to team members and support project deliverables.

Skills

ReactJS

Typescript

PostgreSQL

Frontend Development

Collaboration

Job description

Senior Fullstack Engineer – Frontend Leaning, Handshake AI

Join to apply for the Senior Fullstack Engineer – Frontend Leaning, Handshake AI role at Handshake

Senior Fullstack Engineer – Frontend Leaning, Handshake AI

Join to apply for the Senior Fullstack Engineer – Frontend Leaning, Handshake AI role at Handshake

Your impact

Handshake is building the future of human data for AI.

We partner directly with top AI labs to power large language model (LLM) training and evaluation with high-quality, expert-generated data. As AI models become more sophisticated, the demand for specialized human input continues to grow—and Handshake is uniquely positioned to meet it. We power career platforms at 92% of the top U.S. universities, giving us direct access to verified expert talent across a wide range of domains.

Your impact

Handshake is building the future of human data for AI.

We partner directly with top AI labs to power large language model (LLM) training and evaluation with high-quality, expert-generated data. As AI models become more sophisticated, the demand for specialized human input continues to grow—and Handshake is uniquely positioned to meet it. We power career platforms at 92% of the top U.S. universities, giving us direct access to verified expert talent across a wide range of domains.

Our AI team is rapidly building a new generation of human data products—from expert annotation platforms to AI interviewers and seamless payout infrastructure—all designed to accelerate research and improve model performance.

We’ve assembled a world-class team from YC, Notion, Scale, Coinbase, Palantir, and more, and we’re working directly with many of the world’s leading AI research labs. This is a unique opportunity to join a fast-growing team shaping the future of AI through better data, better tools, and better systems—for experts, by experts.

We’re growing our team and looking for Software Engineers to build high-impact products that support our Fellows in their work, ensuring they have the tools and infrastructure needed to drive AI innovation. This is a unique opportunity to play a pivotal role in a fast-growing space, working directly with leading AI labs and tech companies to develop solutions that enhance research workflows, model evaluation processes, and domain-specific AI applications. You will build critical features for products from the ground up, collaborating closely with product, design, and engineering teams to create seamless and effective experiences.

Location: San Francisco, CA | 5 days/week in-office

Your role

• Day-to-day work will feature regular collaboration on a cross-functional team with a designer, product manager and other engineers. You will also engage frequently with engineers, support, marketing and data analysts across the organization.
• Lead by example in maintaining a high standard of quality in your own work and in the feedback provided to peers in code review and architecture discussions.
• Lend your technical knowledge and experience to influence the team’s roadmap and prioritization of innovation and operational health initiatives such as quality control and on-call.
• Provide mentorship to engineers and unblock and support your team to meet deliverables.
• Lead sizable individual projects and projects that require multiple engineers.
  
  

Your Experience

• Strong experience as a fullstack engineer, with a focus on frontend development.
• Worked with ReactJS, Typescript and PostgreSQL.
• Comfortable working across the stack, from crafting performant frontend interfaces to designing and consuming backend APIs.
• Thrive in a high-velocity environment and can execute quickly while maintaining high standards, adapting seamlessly as priorities shift and new challenges emerge.
• Demonstrate ownership-mentality and maintain a high degree of accountability for your work.
• Demonstrated success collaborating with partners in product, design and analytics to define, build, and ship great products and experiences.
• Experience leading large projects from idea to high quality delivery.
• Act with empathy when working with fellow engineers and coworkers, and enjoy providing mentorship and guidance to enable and support your team.
• Strive for individual and team growth, proactively seeking feedback and identifying areas of the code, processes or procedures that need improvement.
• Strong communicator and can articulate technical concepts and rationale to audiences of varying technical knowledge levels.
  
  

Bonus areas of expertise

• Worked on LLM products in production.
  
  

What We Offer

At Handshake, we'll give you the tools to feel healthy, happy and secure.

Benefits Below Apply To US Employees In Full-time Positions.

• Equity and ownership in a fast-growing company.
• 16 Weeks of paid parental leave for birth giving parents & 10 weeks of paid parental leave for non-birth giving parents.
• Comprehensive medical, dental, and vision policies including LGTBQ+ Coverage. We also provide resources for Mental Health Assistance, Employee Assistance Programs and counseling support.
• Generous learning & development opportunities and an annual $2,000 stipend for you to grow your skills and career.
• Financial coaching through Origin to help you through your financial journey.
• ???? Monthly internet stipend and a brand new MacBook to allow you to do your best work.
• Monthly commuter stipend for you to expense your travel to the office (for office-based employees).
• Free lunch provided 5x a week across all offices.
• ️ Free gym access in San Francisco office building.
• Referral bonus to reward you when you bring great talent to Handshake.
• Team outings throughout the year to stay connected to each other.
• 401k Match: Handshake offers a dollar-for-dollar match on 1% of deferred salary, up to a maximum of $1,200 per year.
• All full-time US-based Handshakers are eligible for our flexible time off policy to get out and see the world. In addition, we offer 13 standardized holidays, and 2 additional days of flexible holiday time off. Lastly, we have a Winter #ShakeBreak, a one-week period of Collective Time Off.
• Handshake offers $500 home office stipend for you to spend during your first 3 months to create a productive and comfortable workspace at home.
• Family support: Parental leave coaching and support provided by Parentaly. We partner with Maven Clinic to provide a lifetime coverage up to $15K for expenses related to fertility and family forming!
• Lifestyle Savings Account: We offer you an annual stipend of $500 to use for purchases such as fitness classes, gym memberships, work-from-home setup, and more.
  
  

Looking for more? Explore our mission, values and comprehensive US benefits at joinhandshake.com/careers.

Handshake is committed to providing reasonable accommodations in our recruitment processes for candidates with disabilities, sincerely held religious beliefs or other reasons protected by applicable laws. If you need assistance or reasonable accommodation, please let your recruiter know during initial communications.

Seniority level

• Seniority level

  Mid-Senior level

Employment type

• Employment type

  Full-time

Job function

• Job function

  Engineering and Information Technology

• Industries

  Software Development

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