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
Requirements
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.
Benefits
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.

Work arrangement
Yes