This role involves leading the design, development, and maintenance of mobile applications for Proof, collaborating with cross-functional teams and optimizing app performance.
Proof is the world's first identity-assured transaction management platform and we are on a mission to digitize trust for all of life’s most critical transactions. Developed by the same market leaders and experts who brought notarization online with Notarize℠, Proof offers trust in a digital world by verifying identities and securing transactions to protect businesses and their customers. Since 2015, we’ve completed many of the world’s first digital commerce transactions, including the first online real estate closing, online mortgage closing, online auto sale, and online will and we're still just getting started!
We’re looking for a Staff Mobile Application Engineer to drive the design and delivery of a 0-1 mobile application at Proof, while also maintaining and evolving our existing Notarize mobile application. This role focuses on solving complex, high-impact mobile engineering problems, contributing to foundational architectural decisions, and delivering greenfield mobile functionality through deep technical expertise in iOS and Android, in close partnership with cross-functional teams across the organization.
What you will do as a Staff Mobile Application Engineer:
- Lead design, development, and maintenance of Proof & Notarize mobile applications and SDK’s for both Android and iOS
- Proactively drive all phases of mobile application development, from ideation to release to tracking and analyzing the impact of shipped features
- Collaborate cross-functionally with designers, developers, QA engineers, and product managers to shape solutions and unblock delivery
- Work with existing and new vendors providing components, SDK’s and API’s enabling Proof mobile applications
- Provide technical leadership on mobile architecture, standards, and best practices
- Contribute to continuous improvements of mobile app automation, unit tests, CI/CD, and overall app reliability
- Triage bugs, track software defects, and ensure their timely resolution
What we're looking for:
- Advanced expertise in Android and iOS application and SDK development
- Experience with NFC, applied cryptography (PKI), wallets, or digital identity is a plus
- Demonstrated experience working across both established mobile applications in production as well as greenfield, 0-1 proofs-of-concept
- Deep knowledge of mobile app lifecycle, app store deployment, and distribution
- Ability to work autonomously in ambiguous problem spaces, owning complex mobile engineering problems from end to end, and with a bias towards action and solutions
- Proven ability to troubleshoot and optimize consumer facing mobile applications
- Strong communication and active listening skills, with a thoughtful, collaborative approach to problem-solving and the ability to partner effectively cross-functionally across the business
- Full ownership of the code you write, from the technical design through to production and ongoing iteration
Our tech:
- Proof platform’s back-end is Ruby on Rails, Postgres SQL, Redis, hosted on AWS. Our front-end apps are built with React, GraphQL, Apollo and TypeScript.
- Proof mobile apps are built with Kotlin and Swift, using GraphQL to integrate with the back-end. Our mobile apps utilize a blend of modern and established frameworks: Jetpack Compose and XML layouts for Android, and SwiftUI and UIKit for iOS.
Our engineering culture:
- Proof has a strong focus on mentorship, with regular 1:1s, reviews, and check-ins to ensure that you are learning & growing as an engineer. Your manager will help you set personal goals, support your learning, and track your progress against those goals, to encourage you in the growth of your career, wherever it may take you.
- You'll be part of a small, cross-functional team with a highly collaborative process that values thoughtful communication, not just with other engineers but with all parts of the organization.
- We’re a startup with big plans, and there’s so much to do. Whether it’s an antiquated legal process, an edge-case user interaction, a quirky piece of code, or unnecessary friction in the CI/CD process, we show up every day with the goal of digging in and leaving something better than we found it.
Our Proof Pillars:
- Pave the Way: When obstacles arise, we break through barriers with passion and perseverance. We lead with creativity and forward-thinking. We aim to set new standards and shape the future in a repeatable, scalable way so the path to success is easier for our team to follow.
- Own It: We embrace the responsibility that comes with supporting life's most important transactions. When a problem arises we relentlessly pursue the solution with a 'Yes before no' attitude. Because every problem and every transaction is treated like it's our own.
- Act with Integrity: We are in the business of building trust and it is at the core of everything we do. We are honest and transparent with our customers, each other and ourselves. If we make a mistake, we own up to it right away and do what it takes to make it right. Our dedication to security and compliance is key to earning trust, fighting fraud and ultimately, our success.
- Play to Win: We believe excellence is about always striving to be better so when we get it wrong, we iterate, we learn and we grow. We know we can only go so far alone, we're better together and collectively, we win!
Here are some of our great benefits:
- Medical, dental, and vision benefits
- Life insurance, long and short-term disability coverage
- 401k Plan with a 4% match, beginning on your hire date
- Unlimited Sick and Vacation time
- 14 paid company holidays
- 2 company Chillax weeks (Summer & Winter)
- 12 weeks of paid parental leave
- 4 week sabbatical after 5 years of continuous full time employment
- Health Reimbursement Arrangements for fertility and gender affirmation
- Lunch on Proof through Grubhub credit
- Monthly work from home stipend
- Professional development credit
- Monthly reimbursement for Wellness
- And more!
This position will be posted and accepting applications through February 13, 2026.
Proof uses Identify, our identity verification tool, to confirm that individuals engaging with Proof at any stage correspond to a real identity. It’s a quick security step that helps keep the process safe for everyone. Identify is used solely for identity verification and fraud prevention and is not used to assess employment eligibility or qualifications.
Proof is committed to building an inclusive environment for people of all backgrounds and everyone is encouraged to apply. We are an equal opportunity employer and do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.
Top Skills
Apollo
AWS
GraphQL
Jetpack Compose
Kotlin
Postgres Sql
React
Redis
Ruby On Rails
Swift
Swiftui
Typescript
Uikit
XML
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