Senior Software Engineer

Arch; San Francisco (CA); Hybrid; USD 100,000 - 150,000; Full time

Job summary

Arch is seeking a passionate Software Engineer to join our engineering team in San Francisco. In this role, you'll work directly with our founders to build cutting-edge software solutions that drive electrification and sustainability.

Ideal candidates have 5+ years of experience in a startup environment and proficiency in TypeScript. You'll be responsible for end-to-end product development and implementing innovative technologies.

Join us to make a meaningful impact on clean energy solutions!

Qualifications

• 5+ years software engineering experience in a fast‑paced startup environment.
• A passion for crafting clean, elegant solutions to complex problems.
• Exposure to classic ML workflows: data cleaning, model training, and iteration.

Responsibilities

• Build and enhance core product features, from backend logic to intuitive user interfaces.
• Own your work end‑to‑end, from concept through deployment.
• Collaborate closely with our founders and engineering team to define and execute our technical roadmap.
• Experiment and innovate with new technologies, particularly in AI/ML.

Skills

Startup Experience

Proficient in TypeScript

Engineering Excellence

ML experience

Tools

Node.js

Next.js

PostgreSQL

Job description

Company Overview

At Arch, we’re on a mission to create a future where every home in the U.S. is powered sustainably. Our software drives electrification and high‑efficiency technologies, helping accelerate society’s transition to clean energy. Backed by leading investors—including Coatue, Floodgate, Gigascale, ReGen, MCJ, and the founders of Aurora Solar—we’re now growing our engineering team and looking for a passionate, driven software engineer ready to shape the future.

About the Product

We are building an advanced AI‑driven analytics platform designed to change how HVAC contractors market and finance energy‑efficient technologies. Our platform leverages machine learning to identify homes ideally suited for electrification upgrades, particularly heat pumps. We empower contractors to streamline their marketing and sales efforts and accelerate the adoption of sustainable solutions. We have customers across the United States.

Role Overview

We're hiring a Software Engineer to join our tight‑knit engineering team of four. In this high‑impact and fast‑paced role, you'll collaborate directly with our founders to build products at the cutting edge of technology and sustainability. This role requires in‑person collaboration 3-4 days per week at our San Francisco office (WeWork or office on Union Square).

If you’re motivated by solving challenging problems, have a passion for elegant code, and want your work to have a meaningful impact, we'd love to hear from you.

What You’ll Do

• Build and enhance core product features, from backend logic to intuitive user interfaces.
• Own your work end‑to‑end, from concept through deployment.
• Collaborate closely with our founders and engineering team to define and execute our technical roadmap.
• Experiment and innovate with new technologies, particularly in AI/ML, to enhance our offerings.

Qualifications

Must‑haves:

• Startup Experience: 5+ years software engineering experience in a fast‑paced startup environment.
• Technical Stack: Proficiency in TypeScript (our stack includes Node.js, Next.js, PostgreSQL).
• Engineering Excellence: A passion for crafting clean, elegant solutions to complex problems.
• ML experience: Exposure to classic ML workflows (even through side projects): data cleaning, model training, and iteration.

Strong Bonuses:

• Experience handling large‑scale datasets—we deal with billions of records and focus heavily on query performance.
• Familiarity with leading‑edge AI productivity tools (Cursor, Windsurf, MCP, etc.).

Who You’ll Work With

• Philipp, Co‑Founder & CEO – MBA and Master’s in Environmental Science from Stanford; led global solar projects with 180+ employees; management consulting at McKinsey.
• Sacha, Co‑Founder & CTO – Dual M.Sc. in Engineering and Management; built AI tools for first responders; previously led a YC‑backed company with 40+ employees.

Ready to Make an Impact?

If this sounds like you, we'd love to connect.