Hi, I’m Karzan Hashem, a Senior Full Stack Engineer with 8+ years of experience building scalable, high-traffic web applications across fintech, marketing, and e-commerce. I specialize in React, Next.js (SSR), Node.js, Python, and Java, and I design cloud-native architectures on AWS and Azure. I enjoy solving real-time systems, payment integrations, A/B testing, observability with DataDog and Sentry, and exploring AI-driven product features including RAG-based LLM integrations to enhance user experiences. I thrive on turning complex business goals into reliable software, collaborating closely with designers and product managers, and continuously refining systems through data-driven insights. I’m passionate about shipping high-quality code, improving site reliability, and mentoring teammates to grow together.

Karzan Hashem

Hi, I’m Karzan Hashem, a Senior Full Stack Engineer with 8+ years of experience building scalable, high-traffic web applications across fintech, marketing, and e-commerce. I specialize in React, Next.js (SSR), Node.js, Python, and Java, and I design cloud-native architectures on AWS and Azure. I enjoy solving real-time systems, payment integrations, A/B testing, observability with DataDog and Sentry, and exploring AI-driven product features including RAG-based LLM integrations to enhance user experiences. I thrive on turning complex business goals into reliable software, collaborating closely with designers and product managers, and continuously refining systems through data-driven insights. I’m passionate about shipping high-quality code, improving site reliability, and mentoring teammates to grow together.

Available to hire

Hi, I’m Karzan Hashem, a Senior Full Stack Engineer with 8+ years of experience building scalable, high-traffic web applications across fintech, marketing, and e-commerce. I specialize in React, Next.js (SSR), Node.js, Python, and Java, and I design cloud-native architectures on AWS and Azure. I enjoy solving real-time systems, payment integrations, A/B testing, observability with DataDog and Sentry, and exploring AI-driven product features including RAG-based LLM integrations to enhance user experiences.

I thrive on turning complex business goals into reliable software, collaborating closely with designers and product managers, and continuously refining systems through data-driven insights. I’m passionate about shipping high-quality code, improving site reliability, and mentoring teammates to grow together.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
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Language

English
Fluent
German
Advanced
Spanish; Castilian
Intermediate
French
Intermediate
Italian
Intermediate
Portuguese
Intermediate
Chinese
Intermediate
Japanese
Intermediate
Arabic
Beginner
Russian
Intermediate

Work Experience

Senior Full Stack Engineer at Almedia
February 1, 2022 - Present
Developed core product features for Freescash, a global pay-to-earn marketing and rewards platform, using React, Next.js (Server-Side Rendering), and TypeScript to power offerwalls, gamified engagement systems, and user reward management experiences serving 1M+ registered users.
Senior Full Stack Engineer at Deloitte
November 1, 2018 - February 1, 2022
Developed a regulatory reporting platform for financial services clients using React, TypeScript, Python and Java (Spring Boot); automated data validation pipelines, transaction dashboards, and exportable compliance reports (CSV/PDF) aligned with EU standards.
Mid Level Full Stack Developer at Annertech
January 1, 2016 - October 1, 2018
Contributed to migrating a legacy PHP-based platform to a modern architecture using React, Node.js, and Python; built interactive product pages with dynamic filtering, and supported cloud infrastructure and onboarding workflows.

Education

Add your educational history here.

Qualifications

AWS Certified Solutions Architect – Associate
January 11, 2030 - March 26, 2026
AWS Certified Developer – Associate
January 11, 2030 - March 26, 2026
Google Professional Cloud Architect
January 11, 2030 - March 26, 2026
Microsoft Certified: Azure Administrator Associate
January 11, 2030 - March 26, 2026
Azure Fundamentals
January 11, 2030 - March 26, 2026
Certified Kubernetes Administrator
January 11, 2030 - March 26, 2026
MongoDB Certified DBA
January 11, 2030 - March 26, 2026
CompTIA Security+
January 11, 2030 - March 26, 2026

Industry Experience

Software & Internet, Financial Services, Professional Services, Media & Entertainment, Retail