UX Engineer

Company: Arcault
Location: Boston
Posted on: February 21, 2026

Job Description:

Job Description Job Description Arcault is an early-stage financial wellness platform helping employees plan for life’s biggest milestones through guided digital journeys and AI-assisted workflows. We’re looking for a UX Engineer to take ownership of our product experience end-to-end—from Figma to production React code. You’ll build on an existing MVP and design foundation, refining and extending it rather than starting from scratch. This is a hands-on, high-agency role where you’ll collaborate closely with product and engineering leadership to improve flows, ship thoughtful UI changes, and continuously iterate based on real user feedback. Early hires at Arcault have meaningful impact. We’re deliberate about building the right foundations from the start: thoughtful UX, a maintainable UI architecture, and an experience that feels trustworthy in a financial context. We value a growth mindset and are excited about people who are eager to learn and adapt—especially as AI changes how product experiences are built. We strongly encourage sharing a portfolio or links to work (live sites, GitHub, Figma, case studies). A résumé is optional. What you’ll do Design and ship user-facing product experiences—from wireframes and prototypes in Figma to production UI in React. Partner with backend/platform engineering to define clean API contracts and deliver end-to-end flows. Engage directly with customers and prospects to understand what’s working, what isn’t, and where the product experience should evolve. Create and maintain a design system that scales with the product and team. Iterate quickly: instrument flows, learn from usage, and refine UX based on evidence and feedback. Help define best practices for building AI-assisted experiences (e.g., clarity, transparency, safe interactions, and trust). Requirements Minimum qualifications Experience building user-facing web applications with React (or equivalent modern frontend framework). Strong UI engineering fundamentals: component design, state management, performance, and debugging. Solid product design/UX instincts demonstrated through past work (flows, interaction design, clarity, and polish). Proficiency in Figma (components, auto-layout, prototyping) and a strong design-to-implementation workflow. Comfort working in an early-stage environment where roles, priorities, and processes will change over time; you’re able to adapt, take ownership, and continue delivering through that change. A growth mindset: curiosity, openness to feedback, and excitement to learn new tools and approaches—especially as AI changes how products are built. Nice to have Experience building or maintaining a design system. Experience with TypeScript, Next.js, testing, or frontend observability. Interest in AI product UX (e.g., prompting UX, uncertainty, explainability, trust & safety patterns). Don’t worry if you don’t check every box—we care more about sound judgment, learning ability, and ownership mindset. Benefits Benefits Competitive salary and meaningful equity (stock options). Medical benefits and 401(k) with company match. Flexible time off. Hybrid work model (Boston-based, at least 2 days per week in office), with in-person time focused on collaboration, pairing, and design discussions. Opportunity to grow with an early-stage company and have real impact on product, systems, and culture.

Keywords: Arcault, Portland , UX Engineer, IT / Software / Systems , Boston, Maine