Senior Full Stack Developer

Full Stack Developer
Remote
September 10, 2026
Application ends: December 9, 2026

Job Description

REQUIREMENTS

  • 6+ years of professional software engineering experience.
  • Strong Full-Stack development experience.
  • Strong experience with React Native / Expo or equivalent mobile technologies.
  • Strong Node.js / TypeScript experience.
  • Strong understanding of REST APIs and distributed systems.
  • Strong SQL/database optimization experience.
  • Experience with PostgreSQL or similar relational databases.
  • Experience with Redis/caching technologies.
  • Strong understanding of cloud infrastructure such as AWS or Azure.
  • Experience with application profiling and performance optimization.
  • Strong understanding of asynchronous programming, concurrency, networking, and API architecture.
  • Experience working with production fintech, payments, Web3, or high-transaction applications is highly desirable.

RESPONSIBILITES

Application Performance

  • Analyze and improve our client’s overall 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.
  • Establish performance benchmarks and continuously measure improvements.

Frontend / Mobile Optimization

  • Review and optimize the existing frontend/mobile architecture and codebase.
  • Improve React Native / Expo application performance.
  • Optimize rendering, navigation, state management, memory usage, and network requests.
  • Remove unnecessary API calls, duplicate requests, inefficient components, and unnecessary re-renders.
  • Implement appropriate caching, lazy loading, pagination, and optimized data-fetching strategies.
  • Improve application stability, crash rates, and overall user experience.

Backend & API Optimization

  • Review and refactor existing backend services and APIs.
  • Identify slow endpoints and reduce API latency.
  • Optimize Node.js / TypeScript services and asynchronous processing.
  • Eliminate unnecessary service-to-service calls and inefficient workflows.
  • Improve API architecture, error handling, concurrency, and scalability.
  • Optimize database queries, indexing, connection handling, and data access patterns.
  • Introduce caching and other performance mechanisms where appropriate

App Architecture & Code Quality

  • Conduct a full technical performance assessment of our client’s existing codebase.
  • Identify duplicated, inefficient, outdated, or poorly structured code.
  • Refactor FE and BE components without disrupting production functionality.
  • Establish clean coding standards and reusable architectural patterns.
  • Identify technical debt and create a prioritized optimization roadmap.
  • Work closely with Engineering, Product, QA, DevOps, and Security teams.


Monitoring & Observability

  • Implement or improve application performance monitoring and observability.
  • Track API latency, error rates, crashes, resource utilization, and critical transaction performance.
  • Establish meaningful performance KPIs and SLAs/SLOs.
  • Use profiling, logs, traces, metrics, and real-user performance data to identify issues.
  • Continuously monitor production performance and proactively resolve bottlenecks.

Are you interested in this position?


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