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I'm Sofiane Chadjaa, a Full Stack Engineer with 5+ years of experience crafting scalable web apps, real-time systems, and high-performance APIs. I’ve delivered fintech and SaaS solutions that cut latency and improve reliability across complex data pipelines. I’m comfortable across frontend, backend, and infrastructure, always aiming for performance, scalability, and maintainability. I enjoy collaborating with cross-functional teams to design robust architectures and delightful developer experiences.…I'm Sofiane Chadjaa, a Full Stack Engineer with 5+ years of experience crafting scalable web apps, real-time systems, and high-performance APIs. I’ve delivered fintech and SaaS solutions that cut latency and improve reliability across complex data pipelines. I’m comfortable across frontend, backend, and infrastructure, always aiming for performance, scalability, and maintainability. I enjoy collaborating with cross-functional teams to design robust architectures and delightful developer experiences.

Sofiane Chadjaa

Full Stack Developer, Front-End Developer, Back-End Developer, +3

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I'm Sofiane Chadjaa, a Full Stack Engineer with 5+ years of experience crafting scalable web apps, real-time systems, and high-performance APIs. I’ve delivered fintech and SaaS solutions that cut latency and improve reliability across complex data pipelines. I’m comfortable across frontend, backend, and infrastructure, always aiming for performance, scalability, and maintainability. I enjoy collaborating with cross-functional teams to design robust architectures and delightful developer experiences.…I'm Sofiane Chadjaa, a Full Stack Engineer with 5+ years of experience crafting scalable web apps, real-time systems, and high-performance APIs. I’ve delivered fintech and SaaS solutions that cut latency and improve reliability across complex data pipelines. I’m comfortable across frontend, backend, and infrastructure, always aiming for performance, scalability, and maintainability. I enjoy collaborating with cross-functional teams to design robust architectures and delightful developer experiences.

Available to hire

I’m Sofiane Chadjaa, a Full Stack Engineer with 5+ years of experience crafting scalable web apps, real-time systems, and high-performance APIs. I’ve delivered fintech and SaaS solutions that cut latency and improve reliability across complex data pipelines.

I’m comfortable across frontend, backend, and infrastructure, always aiming for performance, scalability, and maintainability. I enjoy collaborating with cross-functional teams to design robust architectures and delightful developer experiences.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Language

Arabic

Fluent

English

Fluent

French

Intermediate

Work Experience

Software Engineer at 3S-Pay

June 1, 2024 - Present

Designed and delivered 200+ REST and GraphQL API endpoints using Node.js, Bun, and Express; built real-time communication infrastructure using Server-Sent Events, Socket.IO, and MQTT to connect 1,000+ payment terminals; integrated Keycloak and OAuth2/OIDC; implemented Redis caching reducing DB load by 90% and reducing API times from 350ms to 45ms; architected frontend features with React/Next.js; automated infra with Docker, Nginx, and SSL/TLS; built internal Chrome extension; improved Lighthouse and accessibility.

Front-End Developer at DataMaster

February 1, 2024 - February 1, 2025

Built data dashboards rendering 10,000+ row datasets with React Table and virtualization; reduced API round-trips by 40% via client-side caching with Zustand; elevated WCAG compliance and green Core Web Vitals.

Full Stack Developer (Freelance) at Remote Clients

January 1, 2020 - December 31, 2023

Delivered full-stack web applications for startups and SMBs using React, Vue.js, Node.js, and Django REST; designed and shipped REST APIs backed by PostgreSQL and MongoDB; integrated third-party services; wrote unit/integration tests with Jest and React Testing Library; collaborated with distributed teams using Git workflows and Agile/Scrum.

Full Stack Developer at Remote Clients (Freelance)

January 1, 2020 - December 31, 2023

Delivered full-stack web applications for startups and SMBs using React, Vue.js, Node.js, and Django REST. Implemented REST APIs with PostgreSQL and MongoDB, integrated third-party services, and wrote unit/integration tests with Jest and React Testing Library to reduce regressions. Collaborated with distributed teams using Git, code reviews, and Agile/Scrum.