Freelancer profile translated to English.

Description

Is your AI product stuck in the POC phase? Is your AWS bill skyrocketing?

Does your backend struggle to handle the load? Are you looking for a technical lead who can deliver, not just advise?

As an AWS Cloud Architect and AI Engineer, I build products that run in production with real users and real budget constraints.

10 years of international experience (France, Taiwan, China, Switzerland).

—

🔧 WHAT I DO

▸ AWS Cloud & Backend Architecture

Scalable serverless architectures (Lambda, ECS, DynamoDB, IoT Core).

Infrastructure audits. Cost reduction. IaC (Terraform, CDK, SAM).

▸ AI Products: From Prototype to Production

AI agents, real-time voice assistants, data extraction, RAG.

5 AI products delivered to production in 18 months.

▸ Technical Lead & DevOps

Team management (up to 7 engineers). CI/CD, E2E testing,

real-time monitoring. ISO 27001 certification.

▸ Large-Scale IoT Platform

Multi-cloud architecture for millions of connected devices.

Co-invented IoT patent. AWS IoT Core, MQTT, Sigfox.

—

📊 CLIENT RESULTS

→ Cagn'Up (Garance Mutuelle): fintech backend, 1,000+ users/day

→ UnaConnect: from 0 to 1.8M connected devices, 500+ req/s, in production 4+ years

→ Infodeck: -60% AWS bill, -70% release time

→ Truecast: autonomous AI interview platform + "Whisperer" assistant

→ Rhapsody Run: real-time AI voice coaching (LiveKit + OpenAI + ElevenLabs)

→ DealBreaker: AI-powered financial data extraction (Google Gemini)

—

🏆 Valedictorian EPITECH 2019 · Tsinghua (Beijing) · AWS Certified Solutions Architect

🌍 Native French · Fluent English · Intermediate Mandarin

💬 Have a project? Send me a message, I'll respond within 24 hours.

Industry field of expertise

Languages

French
Native or bilingual
English
Fluent
Chinese
Conversational

Workplace preferences

Remote only

Primarily works remotely

Germen
Senior Fullstack Software Engineer
BANKING AND INSURANCE
August 2024 - Today (1 year and 10 months)
Paris, France
Client Context
Mission for Germen, the technical subsidiary of Garance, a French mutual insurance group managing over €4 billion in assets. The objective: develop several digital products - a consumer fintech app, an InsurTech platform, and an AI-automated compliance tool.

MISSION COMPLETED

Cagn'Up Project (gift card mobile app)
- NestJS backend design and development
- Integration of PayPlug (payments), Ogloba API, Strapi Cloud CMS
- Terraform/Terragrunt infrastructure on AWS (ECS, RDS/PostgreSQL, DynamoDB)
- Implementation of observability pipelines to Splunk (SAM CLI, CloudWatch)

Petit Collectif Project (InsurTech platform)
- Development of new features in a serverless architecture
(AWS Lambda, RDS, EventBridge, SQS)
- Support for Spark data pipelines (AWS Glue, Athena)

DealBreaker Project (AI compliance tool)
- FastAPI backend development
- Automated extraction of financial data for regulatory compliance

EXPERTISE AND TOOLS USED

NestJS, FastAPI, Python, TypeScript, AWS ECS, Lambda, RDS, DynamoDB,
EventBridge, SQS, Glue, Athena, Terraform, Terragrunt, Splunk,
Google Gemini, PayPlug, Strapi

RESULTS OBTAINED

→ Cagn'Up app in production with 1,000+ daily users
→ Client relationship grew from 1 initial project to 3 projects over 2 years
→ DealBreaker tool operational for compliance automation
NestJs FastAPI AWS ECS AWS Lambda Terraform
valentinkao.com
AWS Cloud Architect & AI Engineer
TECH
January 2024 - Today (2 years and 4 months)
Paris, France
Client Context
Since January 2024, I've been freelancing with startups and tech companies (France, Taiwan, Remote) on AWS cloud architecture, AI product development, and IoT infrastructure optimization missions.

Mission Completed
Truecast (HR Tech) — Autonomous AI Interviews
Full-stack development of a 30-minute AI interview platform (Python, Next.js, LiveKit)
Creation of "Whisperer", a real-time assistant for recruiters on Teams/Google Meet

Rhapsody (SaaS) — Real-time AI Voice Coaching
Development of an AI web app (NestJS, OpenAI, ElevenLabs)
Migration to a LiveKit agent architecture on AWS ECS

Delta Vox (Industry) — IoT Infrastructure
Design of a scalable IoT ingestion system via AWS IoT Core
Real-time telemetry data processing

Infodeck (Smart Facilities) — Principal Engineer
Led a team of 4 engineers, reporting to the CEO
Optimization of an IoT SaaS platform (Node.js, Vue.js)
ESG AI Chatbot (Amazon Bedrock), Data Warehouse (Athena, BigQuery, Looker)
AWS cost audit and reduction, CI/CD and E2E testing

Expertise and tools used
AWS (ECS, Lambda, DynamoDB, IoT Core, SQS, S3, Athena, CDK), Python, NestJS, Next.js, TypeScript, Terraform, Docker, OpenAI, Bedrock, LiveKit, ElevenLabs, Stripe, GitHub Actions

Results obtained
Truecast: platform delivered in 2 months, 100% autonomous AI interviews
Infodeck: -60% on AWS bill, -70% on release times
Rhapsody: application in production with real-time voice interaction
4 clients supported, 100% retention
AWS Lambda AWS CDK TypeScript Amazon Bedrock ElevenLabs
UnaBiz
Software Engineering Team Lead
TELECOMMUNICATIONS
March 2019 - October 2023 (4 years and 8 months)
Taipei City, Taiwan
CLIENT CONTEXT

UnaBiz is an international IoT operator (Singapore/France/Taiwan)
specializing in Sigfox/0G networks. The objective: design, build
and scale UnaConnect, the company's cloud IoT platform,
from scratch to millions of connected devices.

MISSION COMPLETED

Leadership & Management
- Creation of the software engineering team as the first engineer
- Recruitment, training, and management of 7 engineers
(recruitment, onboarding, coaching, performance reviews, development plans)
- Leading the ISO/IEC 27001 certification for the platform and the company

Architecture & Development — UnaConnect
- Design and development of the multi-cloud IoT platform (AWS + GCP)
- Support for 2M+ IoT devices across multiple protocols, 500+ req/s
- RESTful APIs (API Gateway) and GraphQL (AppSync) in Node.js
- Cross-platform mobile applications (React Native, Expo):
direct interaction with IoT devices via NFC and Bluetooth
- Multilingual React web applications (TypeScript, Rush, i18next)
- Private IoT server with Docker, Node.js, Express, HTTP2,
RabbitMQ, MongoDB, Redis
- Over-the-air firmware update system (Bluetooth + LTEM)

DevOps & Quality
- CI/CD with GitHub Actions (CloudFormation, automated tests)
- Real-time monitoring with Splunk
- Code review standards — 30% reduction in bugs

EXPERTISE AND TOOLS USED

AWS Lambda, DynamoDB, AppSync, API Gateway, SQS, SNS, S3,
CloudFormation, Node.js, React, React Native, TypeScript,
Docker, MongoDB, Redis, RabbitMQ, Splunk, GitHub Actions

RESULTS OBTAINED

→ UnaConnect: from 0 to 1.8M connected devices, 500+ req/s
→ Serverless architecture in production for 4+ years without redesign
→ ISO 27001 certification obtained
→ Co-invented and filed IoT patent in Taiwan (No. I790542)
→ 30% reduction in bug rate through code review standards
Node.js React.js React Native Amazon Web Services (AWS) IoT

Check out Valentin's experience

Be the first to recommend Valentin

Help this freelancer shine by sharing your experience working together.

Agatha Frydrych

Backend Java Software Engineer

4.7

(3)

Baptiste Duhen

Fullstack developer

4.6

(4)

Amed Hamou

Senior Lead Developer

(2)

Audrey Champion

Web developer

4.3

(3)

Signup to reveal

Master's Degree and Bachelor's degree. Valedictorian
EPITECH - European Institute of Technology
Computer Sciences
Master's Degree
Université de Haute-Alsace Mulhouse-Colmar
Master II, Entrepreneuriat, Management de Projets

Check out Valentin's education

AWS Certified Solutions Architect
AWS
2025

Valentin Kao

AWS Cloud Architect | AI Products in Production

About Valentin

Experience

Recommendations

These freelancer profiles also match your criteria

Education

Certifications

Skill set

Categories