Senior Full-Stack Software Engineer (JavaScript)

Kensho’s Applications group develops the web apps and APIs that deliver Kensho’s AI capabilities to our customers. Our teams are small, product-focused, and intent on shipping high-quality code that best leverages our efforts. We’re collegial, humble, and inquisitive, and we delight in learning from teammates with backgrounds, skills, and interests different from our own.

Our App Experiences team focuses on breathing life into novel ML capabilities, translating them into valuable and intuitive end-user experiences. We collaborate closely with our Product and Design teams to understand user needs, looking for creative applications and delivery mechanisms of our technology. We demo early and often, and we keep a tight iteration loop. We sweat the details when it comes to UX.

As a Senior Full-Stack Software Engineer, you will build AI-centric web applications in TypeScript ranging from experimental POCs to full-fledged product offerings. You'll have significant autonomy over technical and architectural choices, and be responsible for managing short- and long-term trade-offs. The ideal candidate loves product and views technology as a means, not an end, and is excited to collaborate across all aspects of the software development lifecycle.

Kensho states that the anticipated base salary range for the position is 150k–225k. In addition, this role is eligible for an annual incentive bonus and equity plans. At Kensho, it is not typical for an individual to be hired at or near the top of the range for their role and compensation decisions are dependent on the facts and circumstances of each case.

What You’ll Do:

Build full-stack and SPA TypeScript applications ranging from experiments to flagship products

Collaborate on product decisions and communicate technical constraints and considerations

Own and collaborate on technology/architecture decisions and conventions

Teach and learn from the team and the broader organization via mentorship, code review, knowledge sharing, etc.

Self-sufficiently manage project priorities, estimates, and deliverables

What You'll Need:

At least five years of direct experience building commercial web applications in JavaScript/TypeScript

At least three years of that experience working directly on web UIs in a modern framework

At least one domain of deep technical expertise (e.g., web performance, design systems, framework knowledge, etc.)

Product sense, or a strong interest in developing it

Kind, thoughtful, and high-signal communication skills for both technical and non-technical audiences

Ability to translate ambiguous needs and constraints into clear technical requirements

Technologies & Tools We Use:

Development: TypeScript, React, Next.js, Tailwind, LangGraph, AI SDK, Drizzle

Ops: Git, GitHub, Amazon EKS, AWS, Sentry, Langfuse, Prometheus

At Kensho, we pride ourselves on providing top-of-market benefits, including:

Medical, Dental, and Vision insurance

100% company paid premiums

Unlimited Paid Time Off

26 weeks of 100% paid Parental Leave (paternity and maternity)

401(k) plan with 6% employer matching

Generous company matching on donations to non-profit charities

Up to $20,000 tuition assistance toward degree programs, plus up to $4,000/year for ongoing professional education such as industry conferences

Plentiful snacks, drinks, and regularly catered lunches

Dog-friendly office (CAM office)

Bike sharing program memberships

Compassion leave and elder care leave

Mentoring and additional learning opportunities

Opportunity to expand professional network and participate in conferences and events

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We are an equal opportunity employer that welcomes future Kenshins with all experiences and perspectives. Kensho is headquartered in Cambridge, MA, with an additional office location in New York City. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, or national origin.