Principal Engineer, Point of Sale

  • Full-time

Company Description

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.

To solve this problem, we expanded into software and built integrated solutions to help sellers sell online, manage inventory, 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.

Job Description

The Point of Sale (POS) mobile applications are the main entry point through which merchants work with Square. The cross point of sale product team known as "XPOS" is an engineering organization of 35+ software engineers responsible for building shared features that are shared across the fleet of Square's point-of-sale apps. The team is part of the larger XPOS ecosystem engineering organizations. You will report into the engineering lead of the XPOS Core team. Our team's mission is to use the technical reusability of our core platform, maximizing the surfaces of shipped functionality for sellers' benefit.

Engineers at this level are organizational leaders who promote and influence the technical direction of their organization to ensure success of projects. As a Principal Engineer on XPOS Product, you will define the long-term technical vision of the APIs that support our mobile applications and the Square Dashboard experience on web. You will architect, implement, and scale strategic solutions spanning multiple product teams and business organizations, including external partners.

To learn more about Point of Sale:

You Will:

  • Guide and participate in important technical, design, and product discussions with leaders across our multiple product and engineering teams.
  • Build cross team technical efforts and our most complicated technical problems. Manage the delivery of projects including planning, documenting processes and infrastructure, determining operation metrics, rollout, and maintenance.
  • Inspire a team of 35+ software engineers and influence the Square ecosystem of products.
  • Uplevel the technical design and product understanding for the team and lead other team members.
  • Develop new best practices for the team to achieve operational excellence.
  • Be an important partner for Engineering Leadership & Leadership for cross functional stakeholders.
  • Sample projects include designing and scaling internally and externally-facing APIs that support important business functionality such as Add Ons and Remote Settings management.


You Have:

  • 10+ years of experience developing production software for large scale consumer facing mobile applications.
  • Experience as a Principal Engineer level or above at a premier technology company.
  • Advanced Degree in Computer Science or Equivalent experience in lieu of degree
  • Experience leading large feature releases; usually multi-person projects that cross engineering team boundaries.
  • Experience building component-based web apps with modern JavaScript front-end frameworks (e.g. React, Vue, Angular, or Ember).
  • Experience architecting scalable backend systems in Java, Go, or Ruby
  • Experience with AWS or other cloud platforms.
  • Experience envisioning a technical approach/solution, socializing it and aligning partners towards it.
  • Experience with mentoring and upleveling team members.
  • Experience balancing urgency to implement vs technically correct solution.

Additional Information

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.

Zone A: USD $245,100 - USD $299,500
Zone B: USD $245,100 - USD $299,500
Zone C: USD $245,100 - USD $299,500
Zone D: USD $245,100 - USD $299,500

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. 

Benefits include the following:

  • Healthcare coverage
  • Retirement Plans including company match 
  • Employee Stock Purchase Program
  • Wellness programs, including access to mental health, 1:1 financial planners, and a monthly wellness allowance 
  • Paid parental and caregiving leave
  • Paid time off
  • Learning and Development resources
  • Paid Life insurance, AD&D. and disability benefits 
  • Perks such as WFH reimbursements and free access to caregiving, legal, and discounted resources 

This role is also eligible to participate in Block's equity plan subject to the terms of the applicable plans and policies, and may be eligible for a sign-on bonus. Sales roles may be eligible to participate in a commission plan subject to the terms of the applicable plans and policies. Pay and benefits are subject to change at any time, consistent with the terms of any applicable compensation or benefit plans.

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 a proud equal opportunity employer. We work hard to evaluate all employees and job applicants consistently, without regard to race, color, religion, gender, national origin, age, disability, veteran status, pregnancy, gender expression or identity, sexual orientation, citizenship, or any other legally protected class. 

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

Additionally, we consider qualified applicants with criminal histories for employment on our team, assessing candidates in a manner consistent with the requirements of the San Francisco Fair Chance Ordinance.

Block, Inc. (NYSE: SQ) is a global technology company with a focus on financial services. Made up of Square, Cash App, Spiral, TIDAL, and TBD, we build tools to help more people access the economy. Square helps sellers run and grow their businesses with its integrated ecosystem of commerce solutions, business software, and banking services. With Cash App, anyone can easily send, spend, or invest their money in stocks or Bitcoin. Spiral (formerly Square Crypto) builds and funds free, open-source Bitcoin projects. Artists use TIDAL to help them succeed as entrepreneurs and connect more deeply with fans. TBD is building an open developer platform to make it easier to access Bitcoin and other blockchain technologies without having to go through an institution.

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