This is an exciting opportunity to join an early stage company of talented engineers and designers, led by seasoned climate tech veterans. At Zero, Senior Engineers are individual contributors that report to a Lead Engineer. You will work in small teams (1 designer and 1-2 programmers) in six-week cycles, to take loosely defined projects and deliver new features. Senior Engineers are given broad latitude to make project-level design decisions and expected to operate effectively with minimal oversight. We are relentlessly focused on sustainable productivity. You should expect long stretches of deep work, minimal standing meetings, effective in person collaboration with stakeholders and peers, as well as flexibility around your personal life.
Our Senior Mobile Engineer will build the future of our consumer mobile app, which enables homeowners to get a design and quote for their HVAC project without an in person sales visit. The mobile app is our most important digital touchpoint with homeowners, and you will own features end-to-end on both iOS and Android. Today the app is built fully native with SwiftUI and Jetpack Compose, and the groundwork has been laid for rapid iteration and innovation.
You are fluent on both iOS and Android. You may be stronger in one than the other, but you can confidently navigate both platforms, understand the frameworks, and ship production features in Swift and Kotlin. You have at least 5 years of professional software engineering experience, with meaningful time spent building native mobile applications that real users rely on.
You have strong opinions about AI in the mobile development loop. Agentic coding tools - Claude Code, Cursor, Codex, and whatever comes next - are a core part of how you work. You have a point of view on which problems they're great at, where they fall down, and when to keep a human in the loop on review and verification. You treat your AI toolchain the way a craftsperson treats their workshop: opinionated, evolving, and always sharpened.
You are relentlessly customer-centric. When a real user hits a bug, you want to know immediately, and you are happy to drop your in-flight work to unblock them. You see customer-reported bugs as the most important signal you get, not a distraction from your roadmap. Production problems are part of the job, not an interruption to it.
You have a strong bias toward shipping and learning. You know the difference between recklessness and accepted risk, and you are comfortable weighing the severity of one user's problem against the benefit to everyone else. When the call is hard, you make it and move - you don't wait for certainty that may never come.
You care deeply about observability. Before a feature ships, you know how you'll measure it - what events you'll instrument, what dashboard you'll watch, and what the signal looks like for "working" vs "broken." You have experience with a product analytics platform (we use PostHog) and you view a live, populated dashboard as the reward for what you've built, not a follow-up ticket.
You are enthusiastic about in-person work and collaborating with your colleagues in front of a whiteboard. You live within 50 miles of Denver, CO or are willing to relocate.
This is an exciting opportunity to join an early stage company of talented engineers and designers, led by seasoned climate tech veterans. At Zero, Senior Engineers are individual contributors that report to a Lead Engineer. You will work in small teams (1 designer and 1-2 programmers) in six-week cycles, to take loosely defined projects and deliver new features. Senior Engineers are given broad latitude to make project-level design decisions and expected to operate effectively with minimal oversight. We are relentlessly focused on sustainable productivity. You should expect long stretches of deep work, minimal standing meetings, effective in person collaboration with stakeholders and peers, as well as flexibility around your personal life.
Our Senior Mobile Engineer will build the future of our consumer mobile app, which enables homeowners to get a design and quote for their HVAC project without an in person sales visit. The mobile app is our most important digital touchpoint with homeowners, and you will own features end-to-end on both iOS and Android. Today the app is built fully native with SwiftUI and Jetpack Compose, and the groundwork has been laid for rapid iteration and innovation.
You are fluent on both iOS and Android. You may be stronger in one than the other, but you can confidently navigate both platforms, understand the frameworks, and ship production features in Swift and Kotlin. You have at least 5 years of professional software engineering experience, with meaningful time spent building native mobile applications that real users rely on.
You have strong opinions about AI in the mobile development loop. Agentic coding tools - Claude Code, Cursor, Codex, and whatever comes next - are a core part of how you work. You have a point of view on which problems they're great at, where they fall down, and when to keep a human in the loop on review and verification. You treat your AI toolchain the way a craftsperson treats their workshop: opinionated, evolving, and always sharpened.
You are relentlessly customer-centric. When a real user hits a bug, you want to know immediately, and you are happy to drop your in-flight work to unblock them. You see customer-reported bugs as the most important signal you get, not a distraction from your roadmap. Production problems are part of the job, not an interruption to it.
You have a strong bias toward shipping and learning. You know the difference between recklessness and accepted risk, and you are comfortable weighing the severity of one user's problem against the benefit to everyone else. When the call is hard, you make it and move - you don't wait for certainty that may never come.
You care deeply about observability. Before a feature ships, you know how you'll measure it - what events you'll instrument, what dashboard you'll watch, and what the signal looks like for "working" vs "broken." You have experience with a product analytics platform (we use PostHog) and you view a live, populated dashboard as the reward for what you've built, not a follow-up ticket.
You are enthusiastic about in-person work and collaborating with your colleagues in front of a whiteboard. You live within 50 miles of Denver, CO or are willing to relocate.
About Us
Our mission is to electrify the world’s homes for healthy and sustainable living. Residential electrification is an extraordinary decarbonization opportunity - 145 million homes in the United States account for 20% of our climate emissions. But today, electrification is painful - it’s too complicated, time consuming, and expensive. So we’re building a new experience for homeowners, contractors, and utilities. Zero bridges the gap between the digital and the physical with a frictionless experience that makes electrification fast, easy, and affordable. Join our team to build a world class consumer experience that just so happens to electrify America.
About the Role & Your Impact
This is an exciting opportunity to join an early stage company of talented engineers and designers, led by seasoned climate tech veterans. At Zero, Lead Engineers are individual contributors that report to the Head of Product and Engineering, as well as managers for 3 other engineers working in the same product area. We work in small teams (1 designer and 1-2 programmers) in six-week cycles to take loosely defined projects and deliver new features. Lead Engineers are given broad latitude to make product-level design decisions and expected to operate effectively with minimal oversight. We are relentlessly focused on sustainable productivity. You should expect long stretches of deep work, no standing meetings, effective in person collaboration with stakeholders, direct reports, and peers, as well as flexibility around your personal life.
Our Lead Mobile Engineer will be responsible for the redesign of our homeowner app, as well as the design of future mobile applications that are currently early concepts. Our homeowner app enables users to get a design and quote for HVAC projects without having a sales visit from a contractor. The app is our most important digital touchpoint with homeowners, so our Lead Mobile Engineer will play a critical role in defining the future customer experience at Zero. Currently, the app is built fully native using SwiftUI and Jetpack Compose, and we are considering a variety of technical strategies moving forward.
What You Bring
You are a generalist with discerning standards for code quality and architecture. Whether designing new features, writing modular code, performance testing applications, or operating production systems, you want to own projects from beginning to end. You have at least 5 years of professional software engineering experience developing mobile applications and at least 8 years of professional software engineering experience in general. You should have meaningful experience with native iOS and Android application development, as well as informed opinions about React Native and Capacitor/Cordova.
You are a detail-oriented systems thinker. You want to own the whole product, not just isolated features. You always anchor your work on user needs and seek to understand how users operate in a larger context. You may not have experience in climate tech or building science, but you are eager to dive into the messy world of residential electrification.
You have an eye for elegance - the confluence of beauty, effectiveness, and simplicity - and a proven track record of building elegant digital experiences from the ground up. You value functional beauty in the physical world and are excited to build software that will create healthy, comfortable, and sustainable living spaces for our customers.
You are a pragmatic team player. You know that products only matter if they ship. You are prepared to collaborate with product designers and make tradeoffs to deliver projects within a fixed time box. You want lots of freedom, but you know that comes with the responsibility to communicate and deliver.
You are enthusiastic about in-person work. You want to know your users by name and see them smile when they use your designs. You live within 50 miles of Denver, CO or are willing to relocate.
Nice to Have