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Zishan Jawed: Backend-heavy full-stack engineer building scalable fintech systems.

I design and ship backend-heavy systems in fintech and SaaS. My work runs at scale (₦5B+ monthly), stays online (99.9% uptime), and reduces spend (−30%). I lead small teams, review code, and set up CI/CD and infra on AWS/GCP.

Available for work∙Remote • Global Time Zones
Transactions scaled₦5B+/mo
Uptime achieved99.9%
Cost reduction30%
Team led10 engineers

About

Professional Summary

Senior backend-heavy full-stack engineer focused on fintech/payments. I work mainly with Python (FastAPI, Flask, Django), C#/.NET, and JavaScript/TypeScript with React/Next.js. I design microservices and event-driven systems, build clear APIs, and automate CI/CD on AWS/GCP.

Scaled Airgate to ₦5B+ per month with 99.9% uptime
Led and mentored a 10-engineer cross-functional team
Cut cloud costs by 30% through automation and optimization

Tech Stack

Current

Backend-heavy full-stack engineer with expertise across multiple technology stacks and cloud platforms.

Python • FastAPI • Django
.NET Core • C# • SQL Server
React • Next.js • TypeScript
AWS • GCP • Terraform
PostgreSQL • Redis • Kafka
Fintech Product Architect - Zishan Jawed
Fintech Product ArchitectEnd-to-End Solutions

Professional Experience

Building scalable systems and leading teams across fintech, payments, and enterprise applications.

Team Lead / Senior Backend Engineer

03/2023 – Present

CallPhone Ltd.

• Remote (Nigeria/India)

Tech Stack: Python (FastAPI/Flask), .NET Core/C#, SQL Server, PostgreSQL, Redis, Kafka, Next.js/TypeScript, AWS, GCP, Terraform, GitHub Actions

  • Scaled payment platform to ₦5B+ monthly volume with sub-second latency and 99.9% uptime
  • Cut cloud spend ~30% using Terraform, GitHub Actions, and right-sizing on AWS/GCP
  • Reduced fraud/chargebacks by 22% with real-time analytics and rules
  • Led and mentored a 10-engineer cross-functional team

Full Stack Software Engineer

04/2022 – 03/2023

Fishtail

• Remote (US)

Tech Stack: Python (Django), Ruby on Rails, GraphQL, AWS, GCP

  • Improved risk-scoring accuracy by 18% by embedding ML models into APIs
  • Release time −70% after CI/CD and observability upgrades
  • Built banking data APIs and ML-backed risk systems

Software Developer

11/2021 – 05/2022

Kalkine Solutions Pvt. Ltd

• Hybrid (Noida, IN)

Tech Stack: Python, PHP (legacy), Automation, MySQL

  • Migrated PHP monolith to Python and saved 10+ hours/week
  • Won Spotlight Award for exceptional performance

Software Engineer

04/2019 – 10/2021

VixSpace

• Hybrid (Hyderabad, IN)

Tech Stack: REST APIs, IoT, AWS/GCP, SQL

  • Deployed hospital system to 20+ hospitals serving 10k+ users

Featured Projects

Recent freelance work and specialized projects showcasing full-stack capabilities.

ELEC SBE - Business Management System

07/2024 – 03/2025
Freelance (≈20 h/week)View Project →

Tech Stack: ASP.NET (.NET), React, MySQL Server, Python (automations)

Full business flow system for electrical installations & maintenance company in Île-de-France

  • Cut ~100 manual hours/week to ~1–2 hours (≈98–99% reduction)
  • O2C reduced from up to ~60 days → 8–10 days
  • DSO ~90–120 days → <30 days
  • Invoice issuance 3–4 days → instant (automated)
  • Stockout rate 15% → 3%
  • Pick accuracy 90% → 97%

Microsoft - LLM Trainer (RLHF)

07/2025 – 08/2025
Freelance (~20 h/week)

Tech Stack: Python, unittest frameworks, prompt engineering, evaluation pipelines

Code-generation model training for Microsoft via Turing.com

  • Achieved throughput of 100+ items/hour (top among 300+ trainers)
  • Quality rating 4.4/5 (highest among peers)
  • Contributed to internal guidelines and evaluation policy improvements

Amazon - LLM Trainer (BigCode Method)

08/2025 – 09/2025
Freelance (~20 h/week)

Tech Stack: Python, unit-test harnesses, prompt A/B testing, evaluation pipelines, statistical comparison

Code model variant evaluation using BigCode methodology

  • Processed ~100+ prompt-response items/hour across variants
  • Identified prompt-model combinations that drove better performance
  • Delivered comparative reports for model deployment decisions

Skills & Technologies

Comprehensive expertise across backend systems, cloud infrastructure, and modern development practices.

Backend/Infra

Python (FastAPI, Flask, Django)
C#/.NET Core
Ruby on Rails
REST/GraphQL APIs
PostgreSQL
Redis

Cloud/DevOps

AWS
GCP
Terraform
Docker
Kubernetes
CI/CD (GitHub Actions)

Frontend

React
Next.js
TypeScript
JavaScript
Tailwind CSS

Fintech/Payments

Payment Systems
PCI-DSS Compliance
Risk Management
Fraud Detection
Settlement Systems

Education & Certifications

Academic background and professional certifications in computer science and fintech.

Education

B.Tech, Computer Science & Engineering

Arunachal University

2019 – 2022 • First Grade

Diploma, Computer Science & Engineering

Jamia Millia Islamia University

2016 – 2019

Certifications

FinTech: Foundations, Payments, and Regulations

University of Pennsylvania

Status: Completed

View Credential →

JavaScript — The Complete Guide

Beginner + Advanced, 2022

Status: Completed

Get In Touch

Available for full-time and freelance opportunities. Let's discuss how I can help build your next scalable system.

Send Message

Contact Information

Email: [email protected]
Location: Global (Remote, All Time Zones)
Availability: Open to opportunities
Work Model: Remote (global)