Senior Full Stack Developer and Optimization Engineer

Role Overview

Application Performance

• Analyze application performance and responsiveness across mobile, frontend, backend, APIs, databases, networking, and infrastructure.
• Reduce startup, screen loading, API response, and transaction processing latency.
• Optimize login, KYC, wallet, deposits, withdrawals, card management, and transaction journeys.
• Establish performance benchmarks and continuously measure improvements.

Frontend and Mobile

• Optimize the React Native and Expo application, including rendering, navigation, state management, memory use, and network requests.
• Remove unnecessary API calls, duplicate requests, inefficient components, and unnecessary re-renders.
• Implement caching, lazy loading, pagination, and optimized data-fetching strategies.
• Improve application stability, crash rates, and user experience.

Backend and API

• Review and refactor backend services and APIs and reduce slow endpoint latency.
• Optimize Node.js and TypeScript services, asynchronous processing, concurrency, error handling, and scalability.
• Optimize database queries, indexing, connection handling, and data access patterns.
• Introduce caching and other performance mechanisms where appropriate.

Architecture and Observability

• Assess the production codebase, identify technical debt, and create a prioritized optimization roadmap.
• Establish coding standards and reusable architectural patterns while refactoring without disrupting production functionality.
• Implement monitoring and observability for latency, errors, crashes, resource utilization, and transaction performance.
• Use profiling, logs, traces, metrics, and real-user data to proactively resolve bottlenecks.

Experience and Technical Skills

• At least 6 years of professional software engineering experience.
• Strong full-stack development experience with React Native, Expo or equivalent mobile technologies, Node.js, and TypeScript.
• Strong understanding of REST APIs, distributed systems, asynchronous programming, concurrency, networking, and API architecture.
• Strong SQL and database optimization experience, including PostgreSQL or similar relational databases and Redis or caching technologies.
• Strong understanding of cloud infrastructure such as AWS or Azure.
• Experience with application profiling and performance optimization.

Preferred Domain Experience

• Production experience with fintech, payments, Web3, or high-transaction applications is highly desirable.

Collaboration Scope

• Work closely with Engineering, Product, QA, DevOps, and Security teams.
• The description does not specify a workplace arrangement.