Senior Full-Stack Performance Architect

Wonnpay FZE; Dubai; On-site; AED 300,000 - 540,000; Full time

Job summary

Wonnpay FZE in the United Arab Emirates seeks a Senior Full-Stack Performance & Optimization Engineer to own the performance, scalability, code quality, and technical optimization of the WonnPay application.

You will dive into a production codebase, identify bottlenecks across frontend, backend, APIs, databases and infrastructure, and drive measurable improvements for a faster, cleaner, and more scalable platform.

Qualifications

• 6+ years of professional software engineering experience.
• Strong full-stack development experience.
• Experience with React Native / Expo or equivalent mobile technologies.
• Experience with profiling and performance optimization in production.
• Experience with fintech or high-transaction applications is highly desirable.

Responsibilities

• Analyze and improve overall WonnPay app performance and responsiveness.
• Identify performance bottlenecks across mobile, frontend, backend, APIs, database, and infrastructure.
• Reduce app startup time, screen loading time, API response time, and transaction processing latency.
• Optimize critical user journeys including login, KYC, wallet, deposits, withdrawals, card management, and transactions.
• Review and refactor existing backend services and APIs to reduce latency and improve scalability.
• Establish performance benchmarks and continuously measure improvements.
• Implement or improve monitoring and observability with KPIs and SLAs/SLOs.
• Work closely with Engineering, Product, QA, DevOps, and Security teams.

Skills

Full-Stack

Performance optimization

React Native

Node.js

TypeScript

REST APIs

SQL & PostgreSQL

Redis caching

Cloud (AWS/Azure)

Profiling & observability

Tools

React Native

Expo

PostgreSQL

Redis

AWS

Azure

Node.js

Job description

Wonnpay FZE in the United Arab Emirates seeks a Senior Full-Stack Performance & Optimization Engineer to own the performance, scalability, code quality, and technical optimization of the WonnPay application.

You will dive into a production codebase, identify bottlenecks across frontend, backend, APIs, databases and infrastructure, and drive measurable improvements for a faster, cleaner, and more scalable platform.