Principal Web Developer (Rails)
Superconductor
About Superconductor
Superconductor is building the autonomous software organization — a platform where agents don't wait for instructions, but find work everywhere: in customer emails, bug reports, session replays, Slack threads, X posts, etc. Agents that work while you sleep.
We're a team of 7, backed by $7M in funding, and we intend to stay below ~25 humans hopefully forever. That means every hire matters enormously, and we compensate accordingly with highly competitive salary and equity.
We have been building software together for over a decade. We formerly co-founded Gradescope, an AI-powered education grading platform used by millions of students worldwide. Previously, we were AI PhD students at UC Berkeley. All in all, we are four developers, one designer, and two generalist operators, and we all wear multiple hats every day.
Our Values
Customer obsession. We see every customer interaction — every support email, every bug report, every piece of feedback — as a chance to earn trust and build something better. Customer communication is our differentiator, not overhead.
Speed with stability. We move fast, but we do not break things. We know that if something breaks, we're the ones fixing it — sometimes at night. We'd rather invest in getting it right the first time.
Living in the future. We use Superconductor to build Superconductor. We adopt our own tools before anyone else and push them until they break. If something feels like the old way of building software, we question it.
Small team, high standards. Every person on the team has outsized impact, outsized ownership, and outsized responsibility.
Working at Superconductor
Hybrid from our East Bay office: 3 days in our easily BART-accessible office, 2 days from home.
However, our agents work 24/7, and there's real value in having humans cover the night shift. If you are an exceptional candidate, please apply even if you're not in the Bay Area.
Compensation: Highly competitive salary and meaningful equity — we're a small team that plans to stay small.
Benefits: Flexible PTO, parental leave, health insurance, employee-friendly equity terms, and premium equipment.
And of course, a practically unlimited token budget!
The Role
You are the architect, reviewer, and quality guardian for a fleet of AI coding agents. You define the patterns, enforce the standards, and review every meaningful change that ships. You are the last line of defense before code reaches production.
You'll work at the intersection of deep Rails expertise and AI-augmented development, directing agents the way a senior architect directs a team — except your team never sleeps and is as good as you make it.
A realistic goal: you will ship more quality code to production in your first month than you did in all of 2025.
What You'll Do
Review code produced by AI agents for correctness, maintainability, security, and adherence to our standards
Define and evolve the application architecture, module boundaries, and system design principles that agents follow
Write architectural decision records, coding standards, and agent instructions that shape how code gets generated
See customer feedback flow directly into agent-generated tickets and code — and make sure that code is worthy of the customer who asked for it
Jump into production when things break — you've been the person on-call before and you know how to debug fast under pressure
You Are
A VERY senior Rails developer with 10+ years of experience (ideally 15+)
Someone who loves clean code, small methods, clear naming, single responsibility, etc
Experienced deploying, operating, and being on call for at least one medium-to-large Rails application in production
Comfortable with DevOps and debugging production incidents
Excited (not threatened) by the idea that AI writes the code and you shape the outcome
Bonus Points
Active contributor to the Rails community (conferences, gems, blog posts, open source)
Experience with React, Tailwind, Stimulus, Turbo, or Hotwire
A love of AI coding tools (Claude Code, Cursor, Copilot, etc.)
$156k - $210k
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- ...Restock linen rooms in assigned area per the par established by the Executive Housekeeper. Clean stair wells, including stair railing, and vending areas in assigned area. Empty trash from Room Attendants carts and replace trash bag on a timely basis. Perform...RailImmediate startShift work
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$120k - $160k
...technical skills, strong product instincts, and the initiative to act as your own PM. In this early-stage role, you will shape the core developer experience, owning work across the entire stack—from infrastructure and backend architecture to frontend UI, performance, and...Full time- Albertsons Companies Inc. in Berkeley is hiring for front-end roles such as courtesy clerk, customer service associate, or cashier. You’ll help customers, stock shelves, and process transactions while learning on the job to grow your career within a friendly retail team...Weekly payFlexible hours
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...We have an excellent reputation with the clients. Currently, We are looking for entry-level software programmers, Java full-stack developers, Python/Java developers, Data analysts/ Data Scientists, and Machine Learning engineers for full-time positions with clients. Who...Full timeH1b- Future Energy Enterprises is seeking a highly motivated and detail-oriented Software Developer to join our growing team. This role is focused on deepening expertise within an established enterprise platform, the California eTRM , and is ideal for a junior/early-career engineer...Visa sponsorshipWork visa
$196.03k - $245.04k
...UseExpertise in at least one interpreted language such as Python, Ruby on Rails, etc.Hands-on experience with at least one compiled language... ...our product team, leaders, and customers to help design and develop features that make Fivetran the one-stop shop for data...RailFull timeWork at officeRemote workFlexible hours2 days per week$23 - $26 per hour
...encountered while on the job. Remove graffiti and replace plexi/glass as needed. Maintain accurate copy log for all shelter and light rail advertising copy in shop. Ensure all sites are properly maintained in accordance with company standards. Accurately complete all...RailHourly payShift work- About Valency Valency Systems is a small, dynamic team of engineers, scientists, and researchers building the global hub for the agentic research era. We're based in Berkeley, California, and we're building something that matters. If you care about open science, advancing...Full timeImmediate startRemote work3 days per week
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$115k - $130k
...medical devices, robotics, automotive, commercial vehicles, EVs, rail, and more. As part of the global ALTEN Group—57,000+... ...targets. • Lead system-level validation and integration testing, developing test plans that verify safety, reliability, and functionality under...RailFor contractors$115k - $130k
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- ...join our small, high-velocity and mission-driven team. Most of your time will be spent building backend services and developing APIs for our data-rich web application. Ideally, you can also work up the stack on frontend data handling and components. Rise Digital...Full timeRemote work2 days per week
- ...your email provider to make sure you get our emails. Full Satck Developer with AI Experience Wing is on the exciting mission of... ...Developer with AI experience to design and implement end-to-end web applications that integrate AI-powered solutions. The ideal candidate...Work from homeWorldwide
$1,579 - $1,779 per week
..., about 10 miles from downtown. Lake Merritt sits near the city center and features a 3.4-mile shoreline path, while BART provides rail connections to downtown San Francisco in about 15 to 20 minutes. The city includes the Fox Theater and Oakland Museum of California,...RailWeekly payFull timeContract workTemporary workImmediate startRelocation packageShift work- ...may be a hiring bonus which may be used for relocation expenses There is no remote/virtual work scenario Senior/Lead Web Developer Responsibilities for Senior Web Developer Provide broad technical knowledge, analyze and develop complex end-to-end solutions...Full timeContract workWork experience placementLocal areaRemote workRelocation
- ...across North America, we partner with leading companies in aerospace, medical devices, robotics, automotive, commercial vehicles, EVs, rail, and more. As part of the global ALTEN Group—57,000+ engineers in 30 countries,we deliver across the entire product development...RailFor contractors
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