Senior Software Engineer, Payments API

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.

So we expanded into software and started building integrated, omnichannel solutions – to help sellers sell online, manage inventory, offer buy now, pay later functionality through Afterpay, 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

You will:

• Expand and maintain our Payments and Refund APIs, used by both external developers (public docs) and Square products, an essential strategic asset of Square

• Design and implement high-volume, low-latency, distributed transaction processing systems, making thoughtful tradeoffs between consistency and availability when both are not possible

• Abstract away the legacy APIs of the financial world into consistent, coherent service APIs for Square and our sellers products to build upon

• Mentor other engineers and contribute to the direction of the team

• Participate in agile development processes, including stand-ups, sprint planning, and retrospectives

• Work with our product, business, and finance teams to develop Square's global payments strategy

• Focus on operational excellence and deliver fault-tolerant systems to enable our teams to move fast without negatively impacting our customers. 

Qualifications

You Have:

• Understanding and curiosity in creating highly available, scalable, low-latency, global systems to reliably move billions of dollars

• Experience with and an understanding of how to successfully lead complex projects, breaking down the work into components and milestones that can easily be picked up by other engineers

• Interest in changing the payments landscape in the US and globally

• Bachelor's degree and 5+ years of software development experience in Java, Go or similar

Even better:

• Enterprise experience with JVM languages (Java, Kotlin)

• Experience designing & operating fault-tolerant, high throughput, low latency services & infrastructure in a microservices ecosystem

• Experience working in the payments industry

Technologies and practices we use:

• Java, Kotlin, Python

• Guice,Protocol Buffers, jOOQ

• MySql, Aurora,, ElasticSearch, GraphQL

• AWS Cloud Technologies, Kubernetes, Terraform, Datadog

• Design patterns, test driven development

• Metrics driven decision making

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 $198,000 - USD $297,000
Zone B: USD $188,100 - USD $282,100
Zone C: USD $178,200 - USD $267,400
Zone D: USD $168,300 - USD $252,500

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. 

Full-time employee benefits include the following:

• Healthcare coverage (Medical, Vision and Dental insurance)
• Health Savings Account and Flexible Spending Account
• 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