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Jacques Perrin

@jacquesperrin

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Freelance backend & AI architect (10+ yrs): NestJS microservices, AWS/Terraform, production LLM and RAG. Fully remote.

France

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What I'm looking for

Freelance / contract missions only, fully remote, from 550 EUR per day.

I am looking for scale-up SaaS, AI, fintech or deeptech teams that need a lead backend, a fractional CTO or an architect for an AI / LLM platform: NestJS microservices, AWS and Terraform, production RAG. Formats: architecture audit, platform sprint, or a multi-month lead backend / DevOps engagement.

Freelance backend and AI architect with 10+ years on critical backends, and partner and CTO at Cantem, a collective of senior independent developers from École 42. I design scalable NestJS microservice platforms, production LLM pipelines (LangChain, embeddings, RAG) and the AWS infrastructure behind them (Lambda, CDK, Aurora, SQS, Terraform, Kubernetes).

Selected results:

Legal LLM platform (Jimini AI): 8 NestJS + AWS Lambda microservices, 10,000+ legal queries per day, 500,000+ OpenSearch documents refreshed in under a minute, 99.99% uptime.
AI-native dating app (Wingmate SAS, Amata): two releases shipped end-to-end (Australia beta, New York launch), OpenAI matchmaker, real-time BI cut from 8 hours to 30 seconds.
AI video ad platform (Arcads): +18% conversion from A/B tests on 40+ page variants, critical load time cut from 2.6 s to 1.3 s.
High-load iGaming platform (The Luck Factory): 50M+ line codebase, PHP modules about 25% faster, integrity kept across 100,000+ daily active sessions.
Crypto wallet used by 700,000 users (Panteum): rebuild, microservices split and Kubernetes deployment.

I work as lead backend, fractional CTO or AI platform architect: codebase onboarding in the first days, small reviewed PRs, monitoring and up-to-date docs. I work in English and French.

Experience

Work history, roles, and key accomplishments

Current

Lead Backend, AI & DevOps

Current

Wingmate SAS

May 2025 - Present (1 year 5 months)

Lead developer on Amata, an AI-native dating app (Wingmate SAS, $6M pre-seed, New York / Paris team). Shipped two releases end-to-end (Australia beta, then New York launch) with full A/B cycles. Built the OpenAI matchmaker avatar, preference pipeline and compatibility scoring. Cut real-time BI compute from 8 hours to 30 seconds. Terraform/AWS IaC, CI/CD, monitoring, production in two markets.

NestJS NodeJS TypeScript PostgreSQL AWS Terraform OpenAI Dataiku Python iOS

Lead Fullstack

Arcads.ai

Aug 2024 - Nov 2024 (3 months)

Lead fullstack developer on an AI video ad platform. A/B testing workflows over 40+ page variants lifted conversion by 18%. Rebuilt critical front and back components, cutting load time from 2.6 s to 1.3 s. Designed a new free account tier and an AI generation tracking dashboard. Scaled to 100,000+ renders per month with no service interruption.

AWS Lambda AWS CDK Azure Data Factory Lang Chain NestJS PostgreSQL Tailwind TypeScript

Lead Backend & LLM Platform

Jimini AI

Jun 2023 - Jul 2024 (1 year 1 month)

Lead backend on a legal LLM platform. Designed 8 NestJS + AWS Lambda microservices handling 10,000+ legal queries per day over SQS and WebSockets. Async pipelines keep 500,000+ OpenSearch documents updated with under 1-minute latency. Auth0 RBAC with 5+ roles, 100% of critical endpoints secured. GitHub Actions CI/CD, 90%+ Jest coverage, 99.99% uptime, RAG-ready data.