Frontend Software Engineer

MomUp; Cambridge (MA); Hybrid; USD 140,000 - 180,000; Full time

Job summary

MomUp is seeking a Frontend Software Engineer in Cambridge, MA to build and evolve the user-facing surfaces of its AI-native data management platform. You’ll work in React and TypeScript on workflows that let enterprise users configure data products, map schemas, review matches, and explore relationships across millions of records.

You’ll join a small core engineering team in Cambridge, with hybrid work 1-2 days per week, mentorship from a manager and a tech lead, and a focus on end-to-end

Qualifications

• Proficient in TypeScript and React with strong UI skills.
• Experience building data-heavy or configuration-oriented UIs.
• Familiarity with design systems and component libraries.
• Experience with React Query (TanStack) and MUI.
• Exposure to backend concepts and APIs (gRPC/Protobufs).
• Strong testing with Vitest and React Testing Library.
• Git and GitHub version-control workflows.

Responsibilities

• Build and maintain user-facing features in React and TypeScript.
• Integrate frontend with backend services over APIs.
• Collaborate with backend engineers and design to ship features end-to-end.
• Write and maintain tests using Vitest and RTL.
• Participate in code reviews and sprint planning.
• Contribute to agentic driven user experiences.

Skills

TypeScript

React

Frontend development

UI/UX sense

Tools

TanStack Query

MUI

Jenkins

GCP

Vite

React Testing Library

Vitest

Git

GitHub

gRPC

Job description

Our client is a growing software company building an AI-native data management platform that helps large organizations create unified, accurate records across complex data environments. Its technology helps customers discover, enrich, and maintain trusted data profiles that support better decision-making and operational efficiency. The company offers Hybrid work in their Cambridge, MA Office (1-2 days/week) so candidates must be located in the Greater Boston area.

About the Role

Our client is looking for a Frontend Software Engineer to build and evolve the user-facing surfaces of its data products. You'll work in React and TypeScript on workflows and agentic user experiences that let enterprise users configure data products, map and curate schemas, review matches, and explore relationships across millions of records. You'll partner closely with backend engineers and product to turn a complex data platform into an experience users trust. You may occasionally venture into the backend services and APIs that power these experiences.

About the Team

You'll join the company’s core engineering team in Cambridge, MA. The team is a close-knit group of professionals who are always willing to teach and eager to learn. They’ve created a collaborative, supportive, and fun culture while doing serious work. With a small team, every member needs to contribute meaningfully and have a significant impact on the business. When you join, the team will work with you to find a project you're excited to finish and one they’re excited to have.

You'll join a sub-team of 3 or 4 people.

What to Expect

• You'll have a manager who will mentor you in your professional development
• You'll have a tech lead who will support you with scheduling, architecture, and coding
• You'll design, break down, and own stories for every sprint
• Your code will be held to the same standard expected of every engineer

What You'll Do

• Build and maintain user-facing features in React and TypeScript across the company’s data-product UIs and occasionally contribute to Java controllers that power these experiences
• Help design and build new agentic driven user experiences
• Integrate the frontend with backend services over gRPC/REST APIs, handling async data flows and large result sets
• Write and maintain tests with Vitest and React Testing Library
• Participate in code reviews, sprint planning, and design discussions
• Collaborate with backend engineers and design to ship features end to end

What They’re Looking For

Required

• TypeScript: Strong proficiency with TypeScript
• React: Solid understanding of components, state management, hooks, and the virtual DOM
• HTML, CSS and UI Design: Proficiency in building the structure and styling of web pages
• Testing Frameworks: Experience with testing frameworks like Vitest (Jest-compatible API) and React Testing Library
• Version Control: Proficiency in Git and version-control workflows

Nice to Have

• 5+ years applying computer science fundamentals, including object-oriented design, data structures, algorithm design, problem solving, and complexity analysis
• Experience building data-heavy or configuration-oriented UIs
• Familiarity with design systems and component libraries
• Experience with TanStack Query (React Query)
• Experience with Material-UI (MUI)
• Exposure to backend concepts, including APIs and gRPC/Protobufs
• Passion for turning written product requirements into intuitive visual designs for users
• Frontend: React, TypeScript, Vite, TanStack, MUI X Pro
• Version control: Git, GitHub
• CI/CD: Jenkins
• Cloud: GCP

How They Work

• The company has a strong documentation culture. Engineering strategies, architecture reviews, design reviews, and standards are version-controlled and structured for institutional memory
• The team uses a decision-driven process. Significant technical choices are recorded with rationale and alternatives considered
• Frontend and backend engineers collaborate closely, and the UI is treated as a first-class part of the product, not an afterthought

Location

This is a hybrid on-site position based in Cambridge, MA. The company does not currently offer relocation assistance.

Compensation

140 - 180K commensurate with experience

Work Authorization

Applicants must be authorized to work for any employer in the United States. The company is currently unable to sponsor or assume sponsorship of employment visas.

Additional Information

The company provides equal employment opportunities (EEO) to all employees and applicants for employment without regard to race, color, religion, gender, sexual orientation, gender identity or expression, national origin, age, disability, genetic information, marital status, amnesty, or status as a covered veteran in accordance with applicable federal, state and local laws.