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Hi, I'm Brendan King, a Senior Software Engineer with over 10 years of experience building scalable, high-performance applications. I specialize in full-stack development using technologies like React, Node.js, Go, Java Spring Boot, and Ruby on Rails. I enjoy optimizing APIs and improving UI/UX to create seamless user experiences. I have a passion for leading cross-functional teams and mentoring junior engineers. Throughout my career at companies like PayPal and Meta, I've successfully driven innovation and enhanced user satisfaction. I love collaborating across departments to deliver impactful features that make a difference.…Hi, I'm Brendan King, a Senior Software Engineer with over 10 years of experience building scalable, high-performance applications. I specialize in full-stack development using technologies like React, Node.js, Go, Java Spring Boot, and Ruby on Rails. I enjoy optimizing APIs and improving UI/UX to create seamless user experiences. I have a passion for leading cross-functional teams and mentoring junior engineers. Throughout my career at companies like PayPal and Meta, I've successfully driven innovation and enhanced user satisfaction. I love collaborating across departments to deliver impactful features that make a difference.

Brendan King

Full Stack Developer, Developer, Programmer, +1

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Hi, I'm Brendan King, a Senior Software Engineer with over 10 years of experience building scalable, high-performance applications. I specialize in full-stack development using technologies like React, Node.js, Go, Java Spring Boot, and Ruby on Rails. I enjoy optimizing APIs and improving UI/UX to create seamless user experiences. I have a passion for leading cross-functional teams and mentoring junior engineers. Throughout my career at companies like PayPal and Meta, I've successfully driven innovation and enhanced user satisfaction. I love collaborating across departments to deliver impactful features that make a difference.…Hi, I'm Brendan King, a Senior Software Engineer with over 10 years of experience building scalable, high-performance applications. I specialize in full-stack development using technologies like React, Node.js, Go, Java Spring Boot, and Ruby on Rails. I enjoy optimizing APIs and improving UI/UX to create seamless user experiences. I have a passion for leading cross-functional teams and mentoring junior engineers. Throughout my career at companies like PayPal and Meta, I've successfully driven innovation and enhanced user satisfaction. I love collaborating across departments to deliver impactful features that make a difference.

Available to hire

Hi, I’m Brendan King, a Senior Software Engineer with over 10 years of experience building scalable, high-performance applications. I specialize in full-stack development using technologies like React, Node.js, Go, Java Spring Boot, and Ruby on Rails. I enjoy optimizing APIs and improving UI/UX to create seamless user experiences.

I have a passion for leading cross-functional teams and mentoring junior engineers. Throughout my career at companies like PayPal and Meta, I’ve successfully driven innovation and enhanced user satisfaction. I love collaborating across departments to deliver impactful features that make a difference.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Language

English

Fluent

Work Experience

Senior Software Engineer at PayPal

December 1, 2020 - Present

Led full-stack development for PayPal Merchant Platform, focusing on front-end scalability and performance improvements using React, Angular, Node.js, Java, Python, and Go, resulting in 25% higher merchant satisfaction. Redesigned merchant dashboard with React, Redux, and Node.js, improving load time by 30% and reducing support tickets by 25% through real-time transaction tracking and enhanced user experience. Enhanced PayPal API by integrating Go, Java Spring Boot, and Redis, decreasing response times by 30% and increasing API adoption by 12% globally. Integrated real-time fraud detection with WebSockets, Kafka, Python, and Go, reducing fraudulent chargebacks by 12% and improving merchant risk monitoring via instant notifications. Optimized checkout flow implementing GraphQL and React, reducing cart abandonment by 8% and improving transaction completion rates by 10%. Overhauled reporting system using Angular, Java Spring Boot, and Kafka, decreasing report generation time by 40% and in

Senior Software Engineer at Meta

November 30, 2020 - July 11, 2025

Developed dynamic interactive user interfaces for Meta Blueprint using React and Ruby on Rails, enhancing scalability and responsiveness for over 1 million users by 20%. Improved frontend performance with React Hooks and refactored class components, reducing rendering times by 15%. Optimized API integrations between React and Rails using ActiveModelSerializers, improving data load times by 25%. Implemented parallel testing with Rails 6 features, cutting test suite runtime by 30%, accelerating development velocity. Integrated Action Mailbox and Action Text to enable rich text content creation and inbound email handling, increasing user engagement by 10%. Adapted to evolving project requirements, successfully delivering key features within tight deadlines.

Software Engineer at Meta

December 31, 2018 - July 11, 2025

Contributed to Instagram's Carousel Posts feature development using React and Python Django to support multi-content uploads, driving a 20% increase in content interactions. Optimized media upload and delivery systems by implementing efficient file compression algorithms, reducing upload times by 15%. Collaborated with cross-functional teams to integrate front-end React components with Instagram’s Django backend, streamlining carousel post rendering for a 25% faster load time. Enhanced scalability of carousel feature using Django’s REST Framework, supporting increased media uploads and contributing to a 40% growth in daily active carousel post users. Demonstrated strong teamwork and communication with product managers, designers, and senior engineers to facilitate timely feature releases and improve efficiency.

Junior Software Engineer at Meta

June 30, 2016 - July 11, 2025

Collaborated on front-end projects focusing on UI components such as Explore and Multi-Account features, gaining experience with React and Backbone. Implemented dynamic infinite scroll in the Explore tab using React, enhancing user engagement by 20%. Developed account-switching UI for Multi-Account Support using JavaScript, HTML5, and CSS3, increasing multi-account usage by 35%. Gained hands-on experience with front-end technologies, including Sass and Webpack, contributing to modular, scalable code within a high-performance team.