Senior Full Stack Engineer - Web + Java

We are looking for strong Full Stack Engineers to work on large-scale systems. Serving millions of users across web, mobile and connected-TV devices. The role will be part of the Subscriptions and Payments engineering team and will contribute to building Fire TV In-App Purchase (IAP) capabilities, subscription journeys, entitlement workflows and platform integrations. You will work on highly scalable consumer-facing systems where performance, reliability, low latency and seamless user experience are critical, particularly during high-traffic events such as live sports and major content releases. Responsibilities Design, develop and maintain scalable full-stack applications using Java and modern web technologies . Build frontend and backend capabilities supporting subscriptions, payments and entitlement management . Develop responsive, performant user experiences using JavaScript/TypeScript and React or similar frameworks . Build and integrate REST APIs and microservices for subscription and payment workflows. Work on Fire TV IAP integration , including purchases, renewals, cancellations and entitlement synchronization. Integrate with external payment providers, app stores and platform APIs. Build resilient systems capable of handling large traffic spikes and high concurrent usage . Improve application performance, availability, monitoring and reliability. Handle failure scenarios, retries, reconciliation and user-state consistency across distributed systems. Collaborate with backend, frontend, product and platform teams to deliver features end-to-end. Write high-quality, maintainable and well-tested production code. Participate in design reviews, code reviews and architecture discussions. Strong experience with Java, Spring Boot and RESTful services . Strong frontend experience with JavaScript/TypeScript, HTML and CSS . Experience with React, Next.js or similar modern frontend frameworks . Strong understanding of microservices and distributed systems . Experience building high-scale consumer-facing applications. Experience with SQL/NoSQL databases. Exposure to caching systems such as Redis . Experience with messaging/event-streaming technologies such as Kafka is preferred. Experience with cloud platforms such as AWS . Familiarity with Docker, Kubernetes and CI/CD. Good understanding of observability, monitoring and production debugging. Experience 7+ years of software engineering experience. Strong system-design and architecture experience. Experience designing systems for high concurrency, large-scale traffic and high availability . Ability to drive complex technical implementations end-to-end. Experience mentoring engineers and influencing engineering best practices. Note: This is a 6-month contractual role. Best-in-class salary: We hire strong talent and compensate accordingly. Proximity Talks: Meet and learn from designers, engineers, product leaders, and AI practitioners. Continuous learning: Work with a world-class team and stay close to the latest in AI, engineering, and product development. High-impact work: Build AI-first systems and products used at scale by global clients. About Us Proximity is the trusted technology, design, and consulting partner for some of the biggest Sports, Media, and Entertainment companies in the world. We’re headquartered in San Francisco and have offices in Palo Alto, Dubai, Mumbai, and Bangalore. Since 2019, Proximity has built high-impact, scalable products used by millions of users every day. Today, we are a global team of engineers, designers, product managers, and experts solving complex problems and building cutting-edge technology at scale. #J-18808-Ljbffr Proximity Works