Senior Full-Stack Software Engineer (JavaScript)

SupportFinity™; Boston (MA); Hybrid; USD 150,000 - 225,000; Full time

Benefits offered by this job

Medical, Dental, and Vision insurance

Unlimited Paid Time Off

26 weeks of paid Parental Leave

401(k) plan with employer matching

Tuition assistance for degree programs

Job summary

SupportFinity™ is seeking a Senior Full-Stack Software Engineer to build AI-centric web applications in TypeScript. You will enjoy significant autonomy and be part of a collaborative team focused on delivering high-quality technology.

With a location-based flexibility policy, you will work primarily in the United States while occasionally visiting our Cambridge or NYC hubs for teamwork. Competitive salary range of $150,000–$225,000, bonus and equity opportunities are offered.

Join us in creating innovative solutions at the intersection of technology and business!

Qualifications

• Five years of experience building commercial web applications in JavaScript/TypeScript.
• Three years directly working on web UIs in a modern framework.
• Ability to translate ambiguous needs into clear technical requirements.

Responsibilities

• Build full-stack TypeScript applications from experiments to flagship products.
• Collaborate on product decisions and technical constraints.
• Manage project priorities, estimates, and deliverables.

Skills

JavaScript/TypeScript

Modern web frameworks

Web performance

Design systems

Product sense

Kind communication skills

Tools

React

Next.js

Tailwind

AWS

Job description

Kensho Technologies 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 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 is open, honest, and efficient. We dedicate time and resources to explore new ideas, 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.

At Kensho, we believe in flexibility‑first, and give our employees the opportunity to work from where they feel most productive and engaged (must be in the United States). We also value in‑person collaboration, so there may be times when travel to one of our Kensho hubs (e.g., Cambridge, MA or NYC) will be required for team meetings or company events.

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

Benefits

• 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

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.

Location: Cambridge, Massachusetts, United States