Full-Stack Software Engineer II (JavaScript)

SupportFinity™; Boston (MA); On-site; USD 130,000 - 175,000; Full time

Benefits offered by this job

Medical, Dental, and Vision insurance

Unlimited Paid Time Off

401(k) plan with employer matching

Tuition assistance

Dog-friendly office

Bike sharing program memberships

Job summary

SupportFinity™ in Cambridge, Massachusetts, is looking for a Full-Stack Software Engineer II to develop full-stack and SPA TypeScript applications. This role involves collaboration on product decisions and managing project priorities.

The ideal candidate has over 3 years of experience with JavaScript/TypeScript and modern web UI development. The position offers a salary range from $130,000 to $175,000, unlimited paid time off, and comprehensive benefits including medical insurance and a 401(k) plan.

Qualifications

• 3+ years building commercial web applications with JavaScript/TypeScript.
• 2+ years in modern web UI development frameworks.
• Ability to understand product and technical requirements.

Responsibilities

• Build full-stack and SPA TypeScript applications.
• Collaborate on product and technical decisions.
• Manage project priorities, estimates, and deliverables.

Skills

JavaScript/TypeScript experience

Web UI development

Communication skills

Product design interest

Tools

TypeScript

React

Next.js

AWS

GitHub

Job description

Full-Stack Software Engineer II

Location: Cambridge, Massachusetts, United States.

Base salary range: $130,000 – $175,000. Eligible for an annual incentive bonus and equity plans.

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.
• Collaborate on technical decisions and conventions.
• Quickly level up and learn from the team and the broader organization via mentorship, code review, knowledge sharing.
• Manage project priorities, estimates, and deliverables.

What You’ll Need

• At least three years of direct experience building commercial web applications in JavaScript/TypeScript.
• At least two years of experience working directly on web UIs in a modern framework.
• At least one domain of interest to develop deep expertise (e.g., web performance, design systems, framework knowledge).
• Some interest in product design.
• Kind and efficient communication skills for both technical and non-technical audiences.
• Ability to deeply understand product and 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 with 100% company‑paid premiums.
• Unlimited Paid Time Off.
• 26 weeks of 100% paid Parental Leave.
• 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 per year for ongoing professional education.
• 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.

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.