Summary
Overview
Work History
Education
Skills
Timeline
Core Competencies
Strategic Technical Projects
Legal Work Authorization
Personal Information
AdministrativeAssistant
Johnson Pasala

Johnson Pasala

Senior Full Stack Developer | Mern | Next.js | React Native
Johannesburg,GP

Summary

  • Strategic FinTech Engineer: Over 6 years of experience specializing in "Generation 3" ticketing and payment platforms. Expert in building high-conversion, low-latency systems handling millions of Euros in transactions.
  • Full Stack Architecture: Deep expertise in the MERN Stack (MongoDB, Express, React, Node.js) and Java Spring Boot, focusing on headless API architectures and microservices.
  • Performance & Scale: Proven track record of maintaining 99.99% uptime while managing 10,000+ concurrent users during high-pressure "ticket drops."
  • Security & Compliance: Specialist in POPIA (South Africa) and global financial regulations (GDPR/PCI-DSS), implementing idempotent APIs and secure RBAC.
  • Conversion-Centric Development: Skilled in engineering 1-click ordering systems and AI-driven automation that increases sales conversion by up to 21%.

Overview

7
7
years of professional experience
2
2
Languages

Work History

Senior Full Stack Developer

Billetto
09.2024 - 11.2025
  • Conversion-Optimized Checkout Engine: Engineered a '1-click' checkout workflow and address auto-complete features.
  • High-Concurrency Seat Management: Architected a real-time venue mapping system using WebSockets, allowing thousands of users to reserve seats simultaneously without data collisions.
  • Uptime Excellence: Optimized the Node.js/MongoDB backend to sustain 99.99% uptime during extreme traffic surges, ensuring sub-second response times for booking APIs.
  • AI-Driven Automation: Developed AI-powered event description generators and automated 'abandoned basket' email triggers to recover lost revenue.
  • Fraud & Bot Mitigation: Implemented advanced rate-limiting and bot-detection layers to ensure 'fair play' during high-demand event launches.
  • Audit & Compliance: Designed an immutable internal audit log for transaction state changes (Pending → Settled → Refunded) to meet European and South African financial standards.
  • Reviewed code, debugged problems, and corrected issues.
  • Managed version control systems like Git for tracking code changes, enabling streamlined collaboration among team members.
  • Championed adoption of Agile methodologies within the development team resulting in increased efficiency during project delivery cycles.
  • Implemented continuous integration and deployment pipelines to automate code testing, validation, and deployment processes.
  • Reduced application bugs by implementing rigorous unit testing frameworks alongside comprehensive test coverage.
  • Mentored junior developers in adopting industry-standard practices while fostering a collaborative learning environment within the team.
  • Collaborated with fellow engineers to evaluate software and hardware interfaces.
  • Proved successful working within tight deadlines and a fast-paced environment.
  • Conducted detailed API testing using Postman, verifying system integrity and data flow between frontend and backend systems.

Full Stack Developer

InsaTech Solutions
10.2021 - 09.2024
  • Enterprise RBAC Architecture: Designed a granular Role-Based Access Control system for complex admin panels, managing permissions for users, advisors, and moderators.
  • Performance Refactoring: Optimized React frontend components through code-splitting and memoization, leading to a 40% reduction in Initial Page Load (IPL) times.
  • Subscription & Billing: Built an automated recurring billing module for SaaS clients, integrating subscription status with feature-gating logic.
  • Developed functional databases, applications and servers to support websites on back-end.
  • Integrated third-party APIs to enhance functionality and improve overall user experience on web platforms.
  • Developed unit test cases for testing and automation.
  • Reviewed code, debugged problems, and corrected issues.
  • Collaborated with cross-functional teams to design, develop, and launch new features for web applications.
  • Developed responsive web designs, ensuring compatibility across various devices and browsers.
  • Coordinated deployments of new software, feature updates and fixes.
  • Proved successful working within tight deadlines and a fast-paced environment.
  • Conducted data modeling, performance and integration testing.
  • Facilitated seamless integration efforts through diligent API testing and validation processes.

MERN Stack Developer

Aarc Technologies
08.2018 - 09.2021
  • Data Visualization Dashboards: Built dynamic reporting tools using React and D3.js to visualize complex financial datasets for stakeholders.
  • API Standardization: Refactored legacy REST APIs into a unified, documented Headless API architecture, improving developer onboarding time by 30%.
  • Database Optimization: Optimized MongoDB aggregation pipelines to handle large-scale datasets, reducing query execution time by 50%.
  • Implemented CI/CD pipelines for automated testing and deployment processes, increasing efficiency in the software release cycle.
  • Developed reusable code libraries to optimize development time and reduce redundancy within projects.

Education

Bachelor's Degree - Commmerce With Computers

Osmania University
Hyderabad, India
04.2001 -

Skills

Frontend: React

Nextjs

React Native

Redux

Zustand

TypeScript

Tailwind CSS

Backend: Nodejs

Express

WebSockets (Real-time Seating)

Database: SQL

PostgreSQL

MongoDB

MySQL

Firebase

FinTech: Stripe/PayPal/Klarna Integration

Multi-currency Payouts

Refund Orchestration

Security: JWT

HTTP-only Cookies

RBAC

OAuth2

API Encryption

Bot Mitigation

DevOps: Docker

CI/CD

GitHub Actions

Cloud Infrastructure

Audit Logging

API integration

Backend development

Frontend development

Cross-platform development

Mobile app development

JavaScript programming

CSS proficiency

HTML expertise

Web programming

Timeline

Senior Full Stack Developer

Billetto
09.2024 - 11.2025

Full Stack Developer

InsaTech Solutions
10.2021 - 09.2024

MERN Stack Developer

Aarc Technologies
08.2018 - 09.2021

Bachelor's Degree - Commmerce With Computers

Osmania University
04.2001 -

Core Competencies

React, Next.js, React Native, Redux, Zustand, TypeScript, Tailwind CSS, Node.js, Express, Java, Spring Boot, WebSockets (Real-time Seating), SQL, PostgreSQL, MongoDB, MySQL, Firebase, Stripe/PayPal/Klarna Integration, Multi-currency Payouts, Refund Orchestration, JWT, HTTP-only Cookies, RBAC, OAuth2, API Encryption, Bot Mitigation, Docker, CI/CD, GitHub Actions, Cloud Infrastructure, Audit Logging

Strategic Technical Projects

  • Spikevine, The Challenge: Automating campaign budgets and influencer payouts across different regions., The Solution: Built a React/Node.js platform with a custom design system and an integrated ledger for tracking campaign spending in real-time., Outcome: Successfully connected thousands of brands and influencers with 100% payment accuracy.
  • LearnEdge, The Challenge: Providing on-demand access to high-resource remote labs while preventing unauthorized usage., The Solution: Developed a 'Timed-Access' gateway using Java and Node.js. Integrated an automated session-killer that terminated lab instances at the end of paid periods., Impact: Reduced server infrastructure costs by 15% through efficient resource recycling.
  • VOIP Management & Security Suite, Technical Stack: Node.js, MongoDB, REST APIs., Core Function: Engineered a secure credential management system for VOIP providers, featuring encrypted data storage and session-based access logs.

Legal Work Authorization

Authorized to work in South Africa under a Critical Skills Visa

Personal Information

  • Work Permit: Critical Skills Visa
  • Availability: Immediate, South Africa
  • Visa Status: 2024 To 2029
Johnson PasalaSenior Full Stack Developer | Mern | Next.js | React Native