Firas Jday

Firas Jday

Senior Full Stack Developer | AI & Blockchain Expert

Tunis, Tunisia
Node/React
AI/ML
Scripting & Automation
Blockchain

About Me

Senior Full Stack Developer with 5+ years of experience architecting and delivering scalable web and mobile solutions. Expertise spans AI/ML integrations, smart contract development, cloud architecture (AWS, GCP), and DevOps automation. Proven track record in leading teams, driving performance optimizations, and delivering high-impact projects for startups and enterprises.

Professional Focus

Building scalable web and mobile applications

Integrating AI/ML solutions into production systems

Developing secure blockchain applications and smart contracts

Optimizing cloud infrastructure and DevOps workflows

Languages

ArabicNative
EnglishProfessional
FrenchProfessional
Available for new projects

Experience

Senior JavaScript Developer & AI Expert

Cybelle Data
Nov 2024 - Present

Leading development of AI-powered applications and microservices architecture for enterprise clients.

Key Achievements
  • Architected Docker & Kubernetes microservices for zero-downtime deployments
  • Built CI/CD pipelines integrating unit, integration & E2E tests
  • Led & mentored a team of 5 engineers; established coding standards reducing bugs by 30%
  • Developed RAG pipelines with LangChain and fine-tuned GPT-4 chatbots
  • Reduced API latency by 45% and improved semantic search precision by 20%
Technologies & Skills
Docker
Kubernetes
CI/CD
LangChain
GPT-4
RAG

Freelance Full Stack Developer

Self-Employed (Upwork)
Jan 2023 - Present

Delivering end-to-end web and mobile solutions for clients globally, with a focus on blockchain and AI integrations.

Key Achievements
  • Delivered 12+ projects with 5‑star client feedback
  • Built responsive web & mobile apps (React, Next.js, React Native)
  • Developed NFT & staking platforms with Solidity, Hardhat
  • Integrated secure auth (OAuth2, JWT) & Stripe payments
Technologies & Skills
React
Next.js
React Native
Solidity
Hardhat
OAuth2
JWT
Stripe

Senior JavaScript Developer

Tanitlab AI
Jul 2023 - Oct 2024

Developed data automation solutions and cloud-based applications for enterprise clients.

Key Achievements
  • Automated data workflows via Google Apps Script, cutting processing time by 40%
  • Built Node.js & PostgreSQL backends on Google App Engine
  • Generated dynamic BigQuery dashboards via scripting
Technologies & Skills
Google Apps Script
Node.js
PostgreSQL
Google App Engine
BigQuery

Full Stack Developer & Team Lead

BoosterBC
Sep 2021 - Jun 2023

Led development of e-tourism platform and managed a team of developers to deliver high-quality solutions.

Key Achievements
  • Led agile development of MongoDB/Node.js e-tourism platform; increased booking efficiency by 40%
  • Developed analytics tools reducing manual errors by 35%
  • Expanded platform usage by 150% through UX optimizations
Technologies & Skills
MongoDB
Node.js
Agile
Analytics
UX Design

Credentials

Professional Certifications

JavaScript (Intermediate)

HackerRank2023

Design PatternsMemory ManagementConcurrency ModelEvent Loops
Node.js (Basic)

HackerRank2023

Package ManagementEvent LoopEvent EmitterBuffersStreamsFile Systems
JavaScript (Basic)

HackerRank2022

FunctionsCurryingHoistingScopeInheritanceEventsError Handling
Node.js (Intermediate)

HackerRank2023

Event-Driven ArchitectureConcurrencyAdvanced Node.js Concepts
REST API (Intermediate)

HackerRank2023

API Data RetrievalParameter ProcessingPagination

Skills & Expertise

Full Stack DevelopmentAI/ML IntegrationBlockchain DevelopmentCloud ArchitectureDevOps AutomationTeam LeadershipPerformance Optimization

Technical Skills

Frontend

React.js
Vue.js
Next.js
React Native
Angular
Tailwind CSS
Material-UI
D3.js

Backend

Node.js
Express.js
FastAPI
NestJS
REST & GraphQL APIs
Google Apps Script

AI & Machine Learning

TensorFlow
PyTorch
scikit-learn
LangChain
LlamaIndex
RAG

Blockchain

Solidity
ERC-20/ERC-721
Hardhat
Truffle
Web3.js

Databases

PostgreSQL
MongoDB
Firestore
BigQuery
Redis
MySQL

Cloud & DevOps

AWS (Lambda, ECS, S3)
GCP (App Engine, Cloud Functions)
Docker
Kubernetes
CI/CD (Jenkins, GitHub Actions)

Security

OWASP Top 10
SAST/DAST
JWT & OAuth2

Methodologies

Agile/Scrum
TDD
Microservices
DevOps

Testimonials & Recommendations

J

Jérémy Rochot

Data Centric Engineer

Jérémy managed FIRAS directly

Firas is a dedicated and passionate developer who becomes unstoppable once he's on a project. As a Senior Full Stack JavaScript Developer specializing in React, React Native, and Google Apps Script, he consistently delivers high-quality, scalable solutions. He's a pleasure to work with and a real asset to any team. I wholeheartedly recommend him for any challenging development role.

February 21, 2025
a

ahmed dalhoum

Financial Engineer @ Warden Labs | Top Rated Plus Blockchain developer

ahmed worked with FIRAS on the same team

Firas is one of the most talented Node.js developers I've had the pleasure of working alongside. His technical skills are exceptional, particularly his ability to build robust and efficient solutions. He consistently delivered high-quality work and impressed me with his deep understanding of the Node.js ecosystem. Beyond his technical expertise, Firas is a positive and collaborative team player. I highly recommend him for any team seeking a top-tier Node.js developer!

January 31, 2025
S

Shah Fahad

React Native | Next Js

Shah worked with FIRAS on the same team

Firas is a great guy. He is skillful developer handling complex projects building and managing

January 7, 2025
M

Maher Mahouachi

Freelance Expert in Google Workspace & AppSheet | Add-on Developer | Team Leader in Automation & SaaS Solutions

Maher managed FIRAS directly

I had the pleasure of working with Firas Jday on several projects, and I can confidently say that he is one of the most talented and dedicated developers I have ever worked with. Firas is not only an expert in Node.js but also an innovative full stack developer with a passion for solving complex problems with clean, efficient code. His expertise in JavaScript and Google Apps Script is unparalleled, and he consistently transforms ideas into innovative solutions, one line of code at a time. Firas possesses a unique ability to break down complex challenges and deliver creative, well-thought-out solutions that truly make a difference. Whether working independently or in collaboration with others, he approaches every task with determination, and his technical knowledge is only matched by his enthusiasm for continuous learning and growth. I highly recommend Firas for any opportunity where top-tier development skills and a problem-solving mindset are needed. He will undoubtedly be a valuable asset to any team or project.

August 22, 2024

Frequently Asked Questions

I specialize in full-stack JavaScript development with React, Next.js, and Node.js. I also have expertise in AI/ML integration using LangChain and RAG pipelines, as well as blockchain development with Solidity and Web3.js.

Yes, I'm available for freelance projects, particularly those involving complex web applications, AI integration, or blockchain development. Feel free to contact me to discuss your project requirements.

My development process typically involves an initial consultation to understand requirements, followed by planning and architecture design. I use agile methodologies with regular client check-ins, and emphasize clean code, testing, and documentation throughout the development lifecycle.

I maintain clear and consistent communication through your preferred channels (email, Slack, etc.). For project management, I typically use tools like Jira or Trello to track progress and ensure transparency.

Absolutely. I have experience working with clients globally and can adjust my schedule to accommodate different time zones for meetings and deliverables.

© 2025 Firas Jday. All rights reserved.

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