How to apply for Senior/Staff Back-end Engineer

About Arbor

Arbor is building an intelligent electricity marketplace that democratizes wholesale energy pricing, previously exclusive to Fortune 500 companies, for renters, homeowners, and small businesses. Their AI-powered platform aggregates users to unlock cheaper rates and optimize usage in real-time, addressing both cost savings and environmental impact. With $20M+ in funding and $7.5M+ already saved for customers, they're tackling a critical infrastructure problem at the intersection of technology, energy, and sustainability.

About the role

As a Senior/Staff Back-end Engineer at Arbor, you'll build and scale the core infrastructure powering their energy marketplace, including rate monitoring systems and marketplace orchestration. This is a high-ownership role where you'll ship production systems (not just features) using AI-augmented development practices. You'll directly impact how millions access affordable, renewable energy by developing the backend services that match customers with optimal suppliers in deregulated markets.

A typical day

You might start by reviewing metrics from your rate monitoring systems tracking utility pricing across deregulated markets, then collaborate with the lean engineering team to design a new event-driven service for marketplace orchestration. Using AI-augmented development practices, you'd implement scalable backend logic in TypeScript, manage infrastructure with Terraform on GCP, and deploy production systems that directly impact how customers access optimal energy rates.

Who Arbor is looking for

• Has 5+ years building production backend systems at scale, specifically with JavaScript/TypeScript (Node.js) and preferably Nest.js
• Possesses hands-on experience managing real cloud environments using native GCP tooling, serverless architectures, and event-driven systems
• Is proficient with Terraform for infrastructure-as-code and has managed cloud environments beyond tutorials
• Thrives in a lean, high-leverage engineering team and is excited about building systems that solve complex marketplace and pricing problems

Tips for this application

• Highlight specific examples of production systems you've built at scale, especially those involving marketplace dynamics, pricing algorithms, or real-time optimization
• Demonstrate your GCP and Terraform expertise with concrete projects (not just tutorials) - mention specific services you've used and problems you've solved
• Show how you've worked with event-driven architectures and serverless systems in past roles, particularly for data processing or orchestration
• If you have experience with energy, utilities, or fintech domains, emphasize it - otherwise, show enthusiasm for solving complex infrastructure problems
• Tailor your resume to show progression in backend engineering responsibilities, with quantifiable impact on system performance, scalability, or reliability

What to cover in your cover letter

["Explain why you're specifically interested in Arbor's mission to democratize energy pricing and how your backend experience aligns with building marketplace infrastructure", 'Describe a relevant project where you designed scalable backend services for a complex system (preferably involving real-time data or orchestration)', 'Highlight your hands-on experience with GCP, serverless architectures, and Terraform in production environments', "Express enthusiasm for working in a lean, high-ownership environment where you'll ship production systems end-to-end"]

Research before applying

• Understand how electricity deregulation works in different US markets and why this creates Arbor's opportunity
• Research how AI data centers are increasing electricity demand and creating market imbalances
• Explore the $20M+ funding round and the investors involved (likely climate tech or infrastructure-focused VCs)
• Learn about the technical challenges of real-time energy pricing optimization and marketplace orchestration

Likely interview topics

Based on the job description, expect questions about:

• Designing scalable backend services for a marketplace that matches customers with energy suppliers based on real-time pricing data
• Implementing event-driven architectures using GCP native tooling for processing utility rate changes across deregulated markets
• Managing infrastructure-as-code with Terraform in production GCP environments
• Optimizing Node.js/TypeScript services for performance and reliability in a high-stakes financial/energy context
• Approaching system design for AI-augmented development workflows in a lean engineering team

Common mistakes to avoid

• Focusing only on frontend or full-stack experience without emphasizing backend systems at scale
• Listing cloud certifications or tutorial projects without demonstrating production experience with GCP and Terraform
• Applying with a generic resume that doesn't highlight specific backend architecture, scalability, or infrastructure-as-code achievements