Senior Full Stack Engineer

Cssmerge; San Francisco (CA); On-site; USD 176,000 - 242,000; Full time

Benefits offered by this job

Medical, Dental, Vision, Disability, and Life Insurance

Flexible Spending Account / Health Savings Account Options

401(k)

Equity

Unlimited Flexible Time Off

Paid Parental Leave

Pre-Tax Commuter Benefit Plan

Team lunch in office every Tuesday and Thursday

Job summary

Cssmerge is looking for a Full Stack Engineer in San Francisco to design and build software interfaces that connect physical AI with the digital world. You will be responsible for developing end-to-end applications and APIs, ensuring application reliability and security as the company grows.

The ideal candidate has strong experience in Typescript or Python, along with a deep understanding of RESTful APIs and distributed systems. Cssmerge offers a dynamic and collaborative work environment.

Qualifications

• 3+ years building full-stack systems, proficient in Typescript, Python, or a similar language.
• Deep understanding of RESTful APIs, microservices, and distributed systems.
• Experience building real-time systems with stateful protocols like websockets or gRPC streaming.

Responsibilities

• Build end-to-end applications and APIs for autonomous vehicle platforms.
• Architect and implement real-time user-interfaces for internal and external customers.
• Drive code reviews, testing, and documentation, mentoring engineers as you grow into technical leadership.

Skills

Typescript

Python

RESTful APIs

microservices

distributed systems

PostgreSQL

MongoDB

Redis

Job description

Who we are

Atoms is building the machines that power the next era of progress.

Over the last decade, software has transformed the digital world. But the physical world, where food is made, minerals are mined, goods are moved, and industries are run, remains far less intelligent, far less efficient, and far more constrained. We’re changing that.

Atoms builds Physical AI— real‑world robots for the industries that move civilization forward, starting with food, mining, and transport. Our systems are designed to understand, predict, and control the real world with precision, turning complex physical operations into something more reliable, more scalable, and more productive.

This work requires more than robotics. It requires deep integration across hardware, software, AI, operations, manufacturing, and real estate. We don’t just build machines in a lab. We deploy them into real environments, operate them, learn from them, and improve them until they work at scale.

We are roboticists, engineers, operators, and builders. We believe the next great technology companies will not only transform information, but the physical systems that shape everyday life.

If you want to work on hard problems with real‑world impact, join us.

What you’ll do

We’re seeking a Full Stack Engineer to join our founding team who will design and build critical software interfaces that connect our physical AI to the digital world – keeping our applications reliable, secure and fast as we grow.

• Build end‑to‑end applications and APIs that power our autonomous vehicle platforms and systems.
• Architect and implement real‑time user‑interfaces for internal and external customers.
• Build modern frontend and backend experiences that surface insights from high‑dimensional data.
• Debug complex issues across our engineering and data stack.
• Partner with product, design, and engineering to take systems from concept to production.
• Drive code reviews, testing, and documentation, and mentor engineers as you grow into technical leadership.

What we’re looking for

• 3+ years building full‑stack systems, with proficiency in Typescript, Python, or a similar language.
• Deep understanding of RESTful APIs, microservices, and distributed systems.
• Experience building real‑time systems with stateful protocols (websockets, gRPC streaming).
• Strong command of relational and/or NoSQL databases (PostgreSQL, MongoDB, Redis).
• Excellent debugging and problem‑solving instincts under production pressure.
• Experience mentoring engineers or leading team projects is a plus.

Why join us

At Atoms, you’ll work on one of the defining challenges of our time—bringing automation into the physical world to drive real, lasting impact. We exist to uncover valuable unknown truths and turn them into progress, which means constantly pushing beyond what’s known and building what doesn’t yet exist. The work is ambitious and often challenging, but it’s grounded in a shared sense of purpose and a team committed to seeing it through together. Our work only matters if it serves others, and we know that meaningful progress depends on the trust of the people we serve and the strength of our team—so we invest in both, creating an environment where you can do your best work and grow.

What else you need to know

This role is based in our San Francisco office. Atoms is a company driven by invention and continuous change – we are constantly reimagining our industries, building new products, and refining how we operate. We do our best work together. That’s why all of our office‑based teams work onsite, five days a week.

The base salary range for this role is $176,000 – $242,000 per year.

Actual compensation will be determined on an individual basis and may vary depending on experience, skills, and qualifications.

Base salary is just one part of your total rewards package. You may also be eligible for equity awards and an annual performance‑based bonus.

Benefits Summary (USA Full‑Time Exempt Employees)

• Medical, Dental, Vision, Disability, and Life Insurance
• Flexible Spending Account / Health Savings Account Options
• 401(k)
• Equity
• Sick Time, Unlimited Flexible Time Off, and Paid Holidays
• Paid Parental Leave
• Pre‑Tax Commuter Benefit Plan
• Team lunch in our SoMa office every Tuesday and Thursday

Benefits are subject to change at the company’s discretion. Atoms accepts applications on an ongoing basis.

Ready to join us as we serve those who serve others?