Senior Software Engineer - Full Stack

The Company

PayPal has been revolutionizing commerce globally for more than 25 years. Creating innovative experiences that make moving money, selling, and shopping simple, personalized, and secure, PayPal empowers consumers and businesses in approximately 200 markets to join and thrive in the global economy. 

We operate a global, two-sided network at scale that connects hundreds of millions of merchants and consumers. We help merchants and consumers connect, transact, and complete payments, whether they are online or in person. PayPal is more than a connection to third-party payment networks. We provide proprietary payment solutions accepted by merchants that enable the completion of payments on our platform on behalf of our customers.

We offer our customers the flexibility to use their accounts to purchase and receive payments for goods and services, as well as the ability to transfer and withdraw funds. We enable consumers to exchange funds more safely with merchants using a variety of funding sources, which may include a bank account, a PayPal or Venmo account balance, PayPal and Venmo branded credit products, a credit card, a debit card, certain cryptocurrencies, or other stored value products such as gift cards, and eligible credit card rewards.  Our PayPal, Venmo, and Xoom products also make it safer and simpler for friends and family to transfer funds to each other. We offer merchants an end-to-end payments solution that provides authorization and settlement capabilities, as well as instant access to funds and payouts. We also help merchants connect with their customers, process exchanges and returns, and manage risk. We enable consumers to engage in cross-border shopping and merchants to extend their global reach while reducing the complexity and friction involved in enabling cross-border trade. 

Our beliefs are the foundation for how we conduct business every day.  We live each day guided by our core values of Inclusion, Innovation, Collaboration, and Wellness. Together, our values ensure that we work together as one global team with our customers at the center of everything we do – and they push us to ensure we take care of ourselves, each other, and our communities.

Job Summary:

As a Senior Full Stack Developer on the Personalization Platform team, you will design and build the web applications, tools, and backend services that empower data scientists, ML engineers, and product partners to develop, deploy, and monitor large-scale personalization systems at PayPal. You will own end-to-end development of high-quality user interfaces and scalable backend services that support experimentation, feature management, model configuration, insights dashboards, and real-time personalization workflows.

In this role, you will combine strong engineering fundamentals with a product-driven mindset to create intuitive, performant, and reliable tools that accelerate the machine learning lifecycle. You will collaborate closely with cross-functional teams to translate complex personalization and ML requirements into robust system designs and seamless user experiences. Your work will involve integrating backend services with feature stores, streaming systems, model registries, and cloud infrastructure, while ensuring code quality, security, testing, and observability across the full stack.

You will contribute to architectural decision-making, uphold engineering best practices, identify and resolve performance bottlenecks, and advocate for user-centered design principles. Ultimately, you will help build the platforms and interfaces that power personalization at scale and enable teams across PayPal to experiment, innovate, and deliver impactful ML-driven experiences.

Job Description:

Essential Responsibilities:

• Delivers complete solutions spanning all phases of the Software Development Lifecycle (SDLC) (design, implementation, testing, delivery and operations), based on definitions from more senior roles.
• Advises immediate management on project-level issues
• Guides junior engineers
• Operates with little day-to-day supervision, making technical decisions based on knowledge of internal conventions and industry best practices
• Applies knowledge of technical best practices in making decisions

Expected Qualifications:

• 3+ years relevant experience and a Bachelor’s degree OR Any equivalent combination of education and experience.

Additional Responsibilities & Preferred Qualifications:

Additional Qualifications

• Strong proficiency in frontend technologies such as React, TypeScript, JavaScript, Redux, or modern UI frameworks. 

• Experience