Senior Frontend Software Engineer, Trust Web

Since we opened our doors in 2009, the world of commerce has evolved immensely, and so has Square. After enabling anyone to take payments and never miss a sale, we saw sellers stymied by disparate, outmoded products and tools that wouldn't work together.
So we expanded into software and started building integrated, omnichannel solutions - to help sellers sell online, manage inventory, offer buy now, pay later functionality, book appointments, engage loyal buyers, and hire and pay staff. Across it all, we've embedded financial services tools at the point of sale, so merchants can access a business loan and manage their cash flow in one place. Afterpay furthers our goal to provide omnichannel tools that unlock meaningful value and growth, enabling sellers to capture the next generation shopper, increase order sizes, and compete at a larger scale.
Today, we are a partner to sellers of all sizes - large, enterprise-scale businesses with complex operations, sellers just starting, as well as merchants who began selling with Square and have grown larger over time. As our sellers grow, so do our solutions. There is a massive opportunity in front of us. We're building a significant, meaningful, and lasting business, and we are helping sellers worldwide do the same.
The Role
The Trust Web team is a core part of Square's Growth product organization, focused on helping more sellers to begin using Square. Aligned with our strategy to Simplify, Automate, and Graduate seller experiences, we build and maintain web experiences that guide sellers from signup to first payment. Our work directly supports Square's growth by improving onboarding, engagement, and seller success.
We are looking for a product-minded Senior Software Engineer with strong frontend expertise to help develop and improve the web experiences and platform capabilities owned by Trust Web. In this role, you will lead key projects, take ownership of complex features, and collaborate closely with cross-functional partners to deliver impactful and reliable user experiences. You will help evolve our identity web platform, influence engineering best practices, and contribute to a culture of high-velocity execution.
You Will

• Lead end-to-end development of features and enhancements across onboarding, identity, and trust-related web experiences.
• Build and scale React applications held to high standards for performance, maintainability, and accessibility.
• Partner with Product and Design to turn requirements and user insights into simple, effective seller experiences.
• Contribute to architectural discussions and help evolve Trust Web's frontend systems and shared components.
• Collaborate with platform and infrastructure teams to improve tooling, developer workflows, and system reliability.
• Provide technical mentorship within the team, supporting growth of peers through code reviews, pairing, and knowledge sharing.
• Stay current with emerging technologies-including AI-enabled development tools-and apply them where they enhance team velocity or product quality.

You Have

• Candidates in this role typically have 8+ years of industry experience and a BS Degree in Computer Science.
• Strong experience building modern frontend applications, particularly with React and related technologies.
• Experience owning features or subsystems within a broader product area and a proven record of successful launches.
• Great communication skills and an ability to work cross-functionally with partners in Design and Product.
• A sense of customer empathy and desire to influence product direction.
• Understanding and curiosity in creating well thought out, reliable, and performant frontend systems.

Technologies We Use and Teach

• Languages: JavaScript, Typescript
• Frameworks: React, Ember
• Testing: Jest, Playwright
• Tools: LaunchDarkly, Storybook, Snowflake, Sentry, Datadog

We're working to build a more inclusive economy where our customers have equal access to opportunity, and we strive to live by these same values in building our workplace. Block is an equal opportunity employer evaluating all employees and job applicants without regard to identity or any legally protected class. We will consider qualified applicants with arrest or conviction records for employment in accordance with state and local laws and "fair chance" ordinances.
We believe in being fair, and are committed to an inclusive interview experience, including providing reasonable accommodations to disabled applicants throughout the recruitment process. We encourage applicants to share any needed accommodations with their recruiter, who will treat these requests as confidentially as possible. Want to learn more about what we're doing to build a workplace that is fair and square? Check out our I+D page .
Block takes a market-based approach to pay, and pay may vary depending on your location. U.S. locations are categorized into one of four zones based on a cost of labor index for that geographic area. The successful candidate's starting pay will be determined based on job-related skills, experience, qualifications, work location, and market conditions. These ranges may be modified in the future.
To find a location's zone designation, please refer to this resource . If a location of interest is not listed, please speak with a recruiter for additional information.
Zone A:
$217,800 - $326,800 USD
Zone B:
$207,000 - $310,400 USD
Zone C:
$196,100 - $294,100 USD
Zone D:
$185,200 - $277,800 USD
Use of AI in Our Hiring Process
We may use automated AI tools to evaluate job applications for efficiency and consistency. These tools comply with local regulations, including bias audits, and we handle all personal data in accordance with state and local privacy laws.
Contact us at [email protected] with hiring practice or data usage questions.
Every benefit we offer is designed with one goal: empowering you to do the best work of your career while building the life you want. Remote work, medical insurance, flexible time off, retirement savings plans, and modern family planning are just some of our offering. Check out our other benefits at Block.
Block, Inc. (NYSE: XYZ) builds technology to increase access to the global economy. Each of our brands unlocks different aspects of the economy for more people. Square makes commerce and financial services accessible to sellers. Cash App is the easy way to spend, send, and store money. Afterpay is transforming the way customers manage their spending over time. TIDAL is a music platform that empowers artists to thrive as entrepreneurs. Bitkey is a simple self-custody wallet built for bitcoin. Proto is a suite of bitcoin mining products and services. Together, we're helping build a financial system that is open to everyone.