Open to opportunities

Karzan Hashem

@karzanhashem

Message

Senior Full Stack Engineer specializing in scalable web platforms and AI-driven features.

Ireland

Message

What I'm looking for

I seek a senior engineering role focused on scalable web platforms, AI-enabled features, strong reliability practices, and collaborative teams that prioritize data-driven product iteration.

I am a Senior Full Stack Engineer with 8+ years building scalable, high-traffic web applications across fintech, marketing, and e-commerce domains. I specialize in React, Next.js (SSR), Node.js, Python, Java, and cloud-native architectures on AWS and Azure.

At my current role I developed core product features for a global rewards platform serving over 1M registered users, built backend services for real-time reward attribution using Node.js and FastAPI, and implemented secure payout systems integrating PayPal, Stripe, crypto gateways, and gift card APIs.

I have delivered regulatory reporting and digital onboarding platforms, engineered microservices and REST/GraphQL APIs, and contributed to cloud-native CI/CD pipelines. I also implemented observability with Datadog and Sentry, participated in on-call rotations, and used Amplitude to run A/B experiments that informed product decisions.

I design AI-driven product features using RAG and LLM integrations for support automation, fraud enrichment, and personalization, and I thrive in cross-functional teams that value data-driven iteration, reliability, and scalable architecture.

Experience

Work history, roles, and key accomplishments

Current

Senior Full Stack Engineer

Current

Almedia

Feb 2022 - Present (4 years 1 month)

Developed core features for Freecash, a global play-to-earn marketing and rewards platform serving 1M+ users, implementing SSR React/Next.js frontends and backend services for real-time reward attribution and WebSocket balance sync. Built secure payout integrations (PayPal, Stripe, crypto), implemented A/B testing and observability, and designed RAG-based LLM features to improve support and fraud

React Next.js TypeScript WebSockets Stripe Datadog A B Testing

Full Stack Engineer

Deloitte

Nov 2018 - Feb 2022 (3 years 3 months)

Built regulatory reporting and digital onboarding platforms for financial clients using React, TypeScript, Python and Java SpringBoot, delivering automated validation pipelines, reconciliation dashboards, and secure SSO/MFA onboarding. Deployed cloud-native solutions on Azure and AWS and improved CI/CD and observability for compliance workloads.

React TypeScript Spring Boot Python Azure AWS SQL Server REST APIs CI CD OAUTH2

Mid Level Full Stack Developer

Annertech

Jan 2016 - Oct 2018 (2 years 9 months)

Contributed to migrating a legacy PHP platform to modern stacks using React, Node.js and Python, improving performance and developer velocity; built interactive product pages, backend APIs for order processing, and deployed AWS-based infrastructure with CI/CD.

React Node.Js Python AWS REST APIs TypeScript Docker CI CD Cloudfront

Junior Full Stack Developer

Annertech

Jun 2015 - Dec 2015 (6 months)

Developed e-commerce features for a regulated-goods platform, focusing on product discovery, secure checkout flows, and REST APIs for inventory and orders while improving reliability and performance across devices.

React Vue.Js Python REST APIs Testing Monitoring