Staff Mobile Engineer (P4)

See yourself at Twilio

Join the team as a Staff Mobile Engineer for Stytch, where you'll shape the next generation of identity and fraud prevention products.

About the job

As a Staff Mobile Engineer you will help scale Stytch’s core identity and fraud products as we bring Stytch capabilities to Twilio’s full customer base, delivering secure, developer-first identity and fraud prevention experiences. You’ll build mobile SDK products that power authentication, fraud detection and prevention as well as emerging agentic identity use cases. You’ll partner closely with product and engineering leadership to design and deliver high-impact customer-facing features, and evolve our platform for Twilio’s scale. This is a rare chance to operate like a startup within Twilio: you’ll work in a high-ownership environment with startup speed, backed by Twilio’s reach and scale.

Responsibilities

• Build and own the mobile SDKs for Stytch’s identity and fraud detection platforms on Twilio—go deep on device internals for complex signal collection to improve identification of bad actors and ship new SDK surfaces powering core authentication flows, including agenting and non-human identity use cases.
• Partner with Product and Engineering leadership to set direction, translate customer needs into product capabilities, and deliver high-impact roadmap features.
• Collaborate across Twilio and Stytch teams to align on architecture, integrate platform capabilities, and unblock cross-team initiatives.
• Operate with deep technical ownership: author design docs, drive key technical decisions, review code, and stay close to the systems you ship.
• Build in ambiguity—break down complex problems, make pragmatic tradeoffs, and design developer experiences that delight our customers.
• Improve production quality and resilience through strong observability, incident response and remediation.
• Mentor and support other engineers through pairing, feedback, and knowledge-sharing, helping raise the team’s technical bar and culture.

Required

• 6+ years of professional mobile engineering experience, with deep experience in designing, building and maintaining mobile applications.
• Android development experience, fluent in Kotlin or Java.
• Expertise in mobile development ecosystems, frameworks, 3rd party libraries.
• Deep understanding of software engineering best practices, including monitoring, observability, and building maintainable systems.
• Experience making high-impact technical decisions and leading technical initiatives.
• A proven track record of driving technical excellence while keeping customer needs at the center of your work.
• Deep understanding of software engineering best practices, including monitoring, observability, and building for the long term.
• Exceptional communication and collaboration skills, with the ability to influence and align stakeholders.
• Bachelor’s degree in Computer Science or related industry experience.
• Excellent written and verbal communication skills.
• Schedule: ability to work non-standard, on-call rotation weekend and holiday hours.

Desired

• iOS development experience.
• Familiarity with Kotlin Multiplatform, C/C++, Swift or Go.
• Experience building developer tools or SDKs.
• Builder at heart. Through a hobby or your profession, you are passionate about being hands on and seeing your work come to life.

Location

This role will be remote in either the US or Canada.

The estimated pay ranges for this role are as follows

• Based in Colorado, Hawaii, Illinois, Maryland, Massachusetts, Minnesota, Vermont or Washington D.C. : $171,120 - $213,900
• Based in New York, New Jersey, Washington State, or California (outside of the San Francisco Bay area): $181,200 - $226,500
• Based in the San Francisco Bay area, California: $201,280 - $251,600