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Senior Full-Stack Engineer with 6 years of production web-platform experience, currently leading a Next.js 16/React 19 frontend for a full commerce platform and building a Next.js Commerce API that replaces Magento. Strong ownership across API architecture, authorization & security, web performance, and zero-downtime migration of legacy systems. Works fully remotely across EMEA and US-East overlap, leading cross-stack delivery from backend (auth, security, data migrations, payments) to frontend (Next.js App Router, SSR/SSG/ISR, Core Web Vitals, accessibility) with a focus on reliability, security, and measurable performance improvements.…Senior Full-Stack Engineer with 6 years of production web-platform experience, currently leading a Next.js 16/React 19 frontend for a full commerce platform and building a Next.js Commerce API that replaces Magento. Strong ownership across API architecture, authorization & security, web performance, and zero-downtime migration of legacy systems. Works fully remotely across EMEA and US-East overlap, leading cross-stack delivery from backend (auth, security, data migrations, payments) to frontend (Next.js App Router, SSR/SSG/ISR, Core Web Vitals, accessibility) with a focus on reliability, security, and measurable performance improvements.

Khaled Ben Hassen

Full Stack Developer, Web Developer, Back-End Developer, +1

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Senior Full-Stack Engineer with 6 years of production web-platform experience, currently leading a Next.js 16/React 19 frontend for a full commerce platform and building a Next.js Commerce API that replaces Magento. Strong ownership across API architecture, authorization & security, web performance, and zero-downtime migration of legacy systems. Works fully remotely across EMEA and US-East overlap, leading cross-stack delivery from backend (auth, security, data migrations, payments) to frontend (Next.js App Router, SSR/SSG/ISR, Core Web Vitals, accessibility) with a focus on reliability, security, and measurable performance improvements.…Senior Full-Stack Engineer with 6 years of production web-platform experience, currently leading a Next.js 16/React 19 frontend for a full commerce platform and building a Next.js Commerce API that replaces Magento. Strong ownership across API architecture, authorization & security, web performance, and zero-downtime migration of legacy systems. Works fully remotely across EMEA and US-East overlap, leading cross-stack delivery from backend (auth, security, data migrations, payments) to frontend (Next.js App Router, SSR/SSG/ISR, Core Web Vitals, accessibility) with a focus on reliability, security, and measurable performance improvements.

Available to hire

Senior Full-Stack Engineer with 6 years of production web-platform experience, currently leading a Next.js 16/React 19 frontend for a full commerce platform and building a Next.js Commerce API that replaces Magento. Strong ownership across API architecture, authorization & security, web performance, and zero-downtime migration of legacy systems.

Works fully remotely across EMEA and US-East overlap, leading cross-stack delivery from backend (auth, security, data migrations, payments) to frontend (Next.js App Router, SSR/SSG/ISR, Core Web Vitals, accessibility) with a focus on reliability, security, and measurable performance improvements.

Skills

Experience Level

Expert

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Intermediate

Language

Arabic

Fluent

French

Advanced

English

Advanced

German

Beginner

Work Experience

Senior Full-Stack Engineer at Futalis GmbH

June 1, 2022 - Present

Headless commerce API (NestJS/TypeScript) in a modular monolith setup across 10 domain modules (cart, checkout, catalog, orders, payments, subscriptions, fulfillment, promotions). Owned architecture for repository layer and DTO validation, maintained 20+ sequential SQL migrations, and produced OpenAPI documentation with versioned releases. Designed a defense-in-depth authorization model enforcing permissions at both application and database layers. Implemented role-based access control with customer/admin/publishable-key realms using NestJS guards and PostgreSQL Row-Level Security so queries cannot leak other customers’ data even if application code is wrong. Hardened token handling with constant-time HMAC SHA-256 verification, strict audience/role/expiry validation, and rejection of anonymous/service tokens. Built subscriptions and payments with two-phase locking, idempotent claim handling, compensating actions, and support for multiple payment methods (SEPA, cards, PayPal, invoic

Full-Stack Engineer at Smart Management IT Solutions

April 1, 2021 - May 1, 2022

Built and modernized multi-tenant ERP modules (inventory, invoicing, reporting) in a shared codebase supporting 6 international client organizations. Implemented per-tenant module permissions and role-scoped data access across shared services. Improved performance by refactoring Vue/Vuex state management and optimizing store shaping, memoized getters, and lazy module registration, reducing client-side load time. Replaced per-row queries for reporting with batched aggregation in the reporting layer, cutting report generation from minutes to seconds for the largest dataset. Established engineering standards across a 5-engineer team with PSR-12 conventions and design-pattern guidelines; introduced test-driven development using PHPUnit on the PHP/Magento stack to raise coverage to ~70%. Maintained Dockerized Jenkins CI/CD pipelines to remove manual release effort.

Full-Stack Developer at Sourceamax

June 1, 2020 - February 1, 2021

Re-platformed a legacy Survey application (ColdFusion) to a Vue.js SaaS architecture, reducing feature deployment time by 40%. Performed incremental page-by-page migration against live applications to avoid big-bang releases. Built the UI with Vue.js and Vuetify, replacing multi-page flows with a single-page application experience. Implemented dynamic form rendering with conditional question logic and client-side validation so non-technical staff could publish new surveys without developer involvement. Built analytics by creating a data collection and reporting layer in Python after evaluating and benchmarking three BI platforms and documenting trade-offs behind the final recommendation.