Senior Full-Stack Software Engineer (JavaScript)

Kensho is S&P Global’s hub for AI innovation and transformation. With expertise in machine learning, natural language processing, and data discovery, we develop and deploy novel solutions to innovate and drive progress at S&P Global and its customers worldwide. Kensho's solutions and research focus on business and financial generative AI applications, agents, data retrieval APIs, data extraction, and much more.At Kensho, we hire talented people and give them the autonomy and support needed to build amazing technology and products. We collaborate using our teammates' diverse perspectives to solve hard problems. Our communication with one another is open, honest, and efficient. We dedicate time and resources to explore new ideas, but always rooted in engineering best practices. As a result, we can innovate rapidly to produce technology that is scalable, robust, and useful.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 DoBuild full-stack and SPA TypeScript applications ranging from experiments to flagship productsCollaborate on product decisions and communicate technical constraints and considerationsOwn and collaborate on technology/architecture decisions and conventionsTeach and learn from the team and the broader organization via mentorship, code review, knowledge sharing, etc.Self-sufficiently manage project priorities, estimates, and deliverablesWhat You'll NeedAt least five years of direct experience building commercial web applications in JavaScript/TypeScriptAt least three years of that experience working directly on web UIs in a modern frameworkAt least one domain of deep technical expertise (e.g., web performance, design systems, framework knowledge, etc.)Product sense, or a strong interest in developing itKind, thoughtful, and high-signal communication skills for both technical and non-technical audiencesAbility to translate ambiguous needs and constraints into clear technical requirementsTechnologies & Tools We UseDevelopment: TypeScript, React, Next.js, Tailwind, LangGraph, AI SDK, DrizzleOps: Git, GitHub, Amazon EKS, AWS, Sentry, Langfuse, PrometheusAt 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 Recruitment Fraud AlertIf you receive an email from a spglobalind.com domain or any other regionally based domains, it is a scam and should be reported to reportfraud@spglobal.com. S&P Global never requires any candidate to pay money for job applications, interviews, offer letters, “pre-employment training” or for equipment/delivery of equipment. Stay informed and protect yourself from recruitment fraud by reviewing our guidelines, fraudulent domains, and how to report suspicious activity here.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.Job ID: 324984Posted On: 2026-04-09Location: Cambridge, Massachusetts, United States