Freelance Backend Engineers in ParisFreelance Backend Engineers in Paris
ProjectsPeople
Halil Aydin's avatar
Halil Aydin
proParis, France
SaaS & Mobile App Engineer | React, Next.js, Node.js
    4x
    Hired
    5.0
    Rating
    101
    Followers
JITTER_EXPERT

expert

REPLIT_EXPERT

Expert

SaaS & Mobile App Engineer | React, Next.js, Node.js
Cover image for Gluchol | Full-Stack & Mobile App Stabilization
Gluchol | Full-Stack & Mobile App Stabilization
1
27
Cover image for Full-Stack E-commerce Operations Platform
Full-Stack E-commerce Operations Platform
2
32
Cover image for Scalable Hosting Platform Design & Development
Scalable Hosting Platform Design & Development
1
75
Cover image for Crenaly: a booking SaaS I
Crenaly: a booking SaaS I designed and built end-to-end for appointment-based businesses in France: salons, barbers, beauty and wellness. The core idea: when a client cancels, the freed slot is automatically offered to clients who asked for an earlier time. The first to accept gets it, their appointment moves in place, and the slot they leave is offered next. No double booking, no manual work. Around it, a full product: → Branded booking page for each business, embeddable on their own site → Mobile-first booking flow, no account needed → Agenda, client management, team roles & permissions → Verified reviews, analytics, Stripe billing Product, UX/UI, frontend and backend. Next.js · TypeScript · NestJS · PostgreSQL · Redis crenaly.com (http://crenaly.com)
17
37
999
Backend Engineer(3)
Ben Degbe's avatar
Ben Degbe
proParis, France
Expert in Prismic, Next.js, Strapi & Shopify — with 5+ years
    $1k+
    Earned
    1x
    Hired
    5.0
    Rating
    53
    Followers
Expert in Prismic, Next.js, Strapi & Shopify — with 5+ years
Cover image for Tilyo: France's top online CBD shop
Tilyo: France's top online CBD shop
2
11
Cover image for Railflow: (NextJs-Prismic-DotLottie-Typescript-Tailwind)
Railflow: (NextJs-Prismic-DotLottie-Typescript-Tailwind)
1
11
Cover image for Nuelit - Career Services Platform Development
Nuelit - Career Services Platform Development
0
24
Cover image for Digidzign – AI-Powered Digital Ecosystems & Company Platform
Digidzign – AI-Powered Digital Ecosystems & Company Platform
0
30
Backend Engineer(2)
Prisca Aure's avatar
Prisca Aure
proParis, France
Senior React & React Native Engineer | Freelance
    1x
    Hired
    7
    Followers
Senior React & React Native Engineer | Freelance
Cover image for Moody | Express emotions visually (React Native App)
Moody | Express emotions visually (React Native App)
0
39
Cover image for Momentum | French positive affirmations app
Momentum | French positive affirmations app
0
78
Cover image for Shuffl | Discover new music with a shake (Spotify app)
Shuffl | Discover new music with a shake (Spotify app)
0
85
Cover image for Aura Studio: AI-Powered Creative Identity App
Aura Studio: AI-Powered Creative Identity App
0
15
Backend Engineer(3)
Guillaume Derivery's avatar
Guillaume Derivery
Paris, France
CTO / Fullstack dev / CPO. On Scope, on Time, on Budget.
    5.0
    Rating
    12
    Followers
CTO / Fullstack dev / CPO. On Scope, on Time, on Budget.
Cover image for Lawpair Fullstack Platform
Lawpair Fullstack Platform
1
14
Cover image for Chivy App & Platform Redevelopment
Chivy App & Platform Redevelopment
1
19
Cover image for Pety Fullstack Insurtech Platform
Pety Fullstack Insurtech Platform
1
16
Cover image for Cultivate Minting Platform
Cultivate Minting Platform
1
16
Backend Engineer(1)
Eriel Cruz's avatar
Eriel Cruz
Paris, France
Building Modern Websites & Deploying Self-Hosted Apps
    $1k+
    Earned
    3x
    Hired
    5.0
    Rating
    5
    Followers
Building Modern Websites & Deploying Self-Hosted Apps
Cover image for Professional Photography Website Gallery
Professional Photography Website Gallery
0
8
Cover image for Modern and Responsive Business Website creation
Modern and Responsive Business Website creation
0
15
Cover image for Global Deployment of Self-Hosted Applications
Global Deployment of Self-Hosted Applications
0
12
Placeholder project card media
View more →
Backend Engineer(2)
Sathwika Bandaru's avatar
Sathwika Bandaru
Saint-Denis, France
AI Engineer building LLM, RAG & AI automation solutions
New to Contra
AI Engineer building LLM, RAG & AI automation solutions
Cover image for Collaborative project, contributed key production
Collaborative project, contributed key production components of Med-V²QA, a clinical Visual Question Answering system built on the MUMC architecture for radiology image analysis. My contributions: built the Dual-Gate Guardrail System (Gate 1 rejects non-medical intent, Gate 2 uses a local CLIP classifier to reject non-medical images ensuring clinical safety and system focus); developed the Batch Triage module using zero-shot CLIP to automatically sort and prioritise the most abnormal scans from uploads of up to 20 images; integrated Voice I/O using OpenAI Whisper for speech-to-text transcription and gTTS for audio readout of answers; built the PDF report generation module producing structured clinical reports with patient data, notes, and VQA results; and developed the FastAPI backend handling high-performance async request processing across all services. Built as part of a team my work covered the safety layer, multimodal I/O, clinical reporting, and backend API infrastructure.
0
48
Cover image for Collaborative project built at Kaggle
Collaborative project built at Kaggle Week 26 GenAI Hackathon, contributed the core AI engineering layers of a Business Law RAG Assistant that answers legal document queries with source citations and live faithfulness verification. My contributions: built the hybrid FAISS + BM25 retrieval pipeline for accurate document search; designed the multi-agent orchestration system coordinating retrieval, generation, and verification agents; implemented the faithfulness verification layer to evaluate and score LLM output quality; integrated an MCP tool server enabling live web search as a fallback; and built the analytics dashboard tracking query performance and retrieval metrics. Built as part of a 4-person team, my work covered the RAG pipeline, agentic architecture, and evaluation infrastructure.
0
48
Cover image for Built as part of a
Built as part of a team, my contributions covered the pipeline orchestration, model serving, and data infrastructure layers.
0
49
Cover image for Built a Medical NLP system
Built a Medical NLP system that processes clinical text to extract healthcare entities, redact sensitive information, and structure unstructured medical data using NER pipelines and FastAPI for backend integration.
0
54
Backend Engineer(1)