Senior Full-stack Engineer

Arbor•Boston, MA

1d•Remote

About The Position

Arbor is building an intelligent electricity marketplace to power an abundant electric future. As AI data centers drive a surge in electricity demand, millions of homes and businesses remain trapped with 20th century monopoly interfaces, overpaying by billions while cheap renewable energy goes to waste. Our AI-powered platform aggregates users to unlock wholesale pricing, automatically switches between the best rates, and optimizes usage to align with prices in real-time—delivering the same market advantages that were previously exclusive to Fortune 500 companies. We've raised over $20 million from leading investors and have saved over $7.5 million for tens of thousands of homes and businesses. The Opportunity We're looking for a Senior front-end leaning fullstack engineer to own the user-facing experience of our energy marketplace—the interface where tens of thousands of customers see their savings, compare rates, and take action on their energy decisions. You'll be hands-on building products while also elevating the frontend craft across our engineering team. This is a player-coach role: you'll ship high-impact features, set technical direction for frontend architecture, and mentor engineers on a lean team where quality and velocity both matter.

Requirements

5+ years of full stack engineering experience, with at least 1-2 years in a tech lead or senior mentorship capacity
Expert-level React and Next.js skills; you've architected and scaled production applications, not just contributed to them
Familiarity with SQL (Postgres preferred), Node, API development patterns
Strong TypeScript proficiency and opinions on frontend patterns that actually work at scale
Clear communication skills; you can articulate technical tradeoffs to engineers and non-engineers alike
Eye for UI/UX quality; you care about the details that separate good products from great ones
Experience with modern frontend tooling, testing strategies, and performance optimization
AI fluency: you're already using AI coding tools daily and excited to help the team level up their AI-augmented workflows
Comfort with ambiguity and a bias toward shipping; you thrive when ownership is high and direction-setting is part of the job

Nice To Haves

Interest in energy, climate tech, or marketplace products is a strong plus

Responsibilities

Lead user-facing development for our marketplace platform, from real-time rate comparisons to customer dashboards and enrollment flows
Set technical direction for frontend architecture, tooling, and best practices across the team
Build polished, performant interfaces that make complex energy market data intuitive for consumers and businesses
Mentor and grow frontend engineers; conduct code reviews that raise the bar on quality and craft
Partner with product and design to translate user needs into delightful, high-converting experiences. Take product ownership on select features and projects when necessary.
Champion AI-augmented development workflows - we expect leads to model how AI tools can multiply team output
Balance hands-on contribution (expect 60-70% coding) with technical leadership and cross-functional collaboration