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Debanjan MazumdarDM

Debanjan Mazumdar

Automatisation IA | Ingénieur GTM | Claude Code

€600/day
Paris, FR
8-15 years

Average response time: 1 hour

About Debanjan

Hello, I am Debanjan — open-source AI & mobile builder.

My freelance AI pipelines help SMEs and scale-ups to replicate this level of results on their GTM, outbound and mobile apps.


The tangible impact of the systems I build:

→ €20-30k/month of pipeline generated by cold outbound engines (3.4x conversion rate)

→ €12-16k/month of revenue protected by CRM synchronization ↔ Slack ↔ Calendar

→ iOS and Android mobile MVP delivered in 3 weeks (vs. 3 months in an agency, €80-150k saved)

→ 40+ hours/month recovered thanks to automated generators (proposals, content, code audit)


My way of working:
💰 Revenue Engine — Autonomous cold outbound

Cloudflare Worker + Gemini + Cal.com. ICP filtering, AI personalization, instant booking.
🛡️ Deal Guard — CRM Synchro ↔ Slack ↔ Calendar

Lead captured → CRM updated + team notified in real time. Zero missed follow-ups.
📈 Growth Engine — AI Scraper + icebreakers based on customer feedback

My scrapers analyze websites using a Humanization Toolkit (HIT) to write icebreakers that match the client's tone (open-source humanization engine, 107 tests, 11 cycles of CLEAN adversarial auditing). 100+ hours/month of manual research eliminated.
📱 Mobile Engine — Expo + Claude Code + EAS Cloud

deb-mobile-template delivers a testable MVP on TestFlight and the Play Store in 3 weeks: Expo framework + Claude Code, 5 pillars of product design (core function / core loop / accessory features / surface area / retention hook — Nick Saraev method), 98 tests, 2-pass security audit, no Mac required.


Typical mission: week 1, audit + quantified roadmap; weeks 2-3, build of the first engine (ROI usually within 4 weeks); week 4, production launch + ops transfer.
Stack:

AI & LLM: Claude Code, Claude API, GPT-5, Gemini
Automation: n8n, Make.com, Cloudflare Workers, Modal
Mobile: React Native, Expo, EAS Build
Code: Next.js, Python, TypeScript, Supabase
  • English

    Native or bilingual

  • French

    Fluent

Can work on-site
Paris (up to 50km)

Experience

  • ProdCraft
    AI Automation Expert — AI Automation & Mobile - Indépendant
    January 2026 - Today (6 months)
    Paris, France
    Built an AI Studio for SMBs and scale-ups on cold outbound, AI automation and mobile POCs. Activity carried out in parallel with a salaried position at Wiser (evenings, weekends, 1 flexible day/week).

    Main achievements:
    - outbound-engine: autonomous cold outbound system (Cloudflare Worker + Gemini + Cal.com), deployed open-source
    - deb-mobile-template: Expo framework + Claude Code + EAS Cloud, 98 automated tests, 2-pass security audit, from zero to TestFlight in 3 weeks
    - ring: audit-loop adversarial for code generated by LLM, multi-provider (Anthropic + OpenRouter), 11 rounds CLEAN on its own codebase
    - humanize: 4-stage voice-matched pipeline, 107 tests, 11 rounds CLEAN adversarial audit
    - Designed and delivered a large-scale, autonomous cold email pipeline (24,000 emails/month, ~800/day across 32 warmed inboxes) with AI personalization (Claude), response classification, and contextual auto-reply → 4% response rate, 3-hour hot-lead SLA via Telegram and Slack
    - Architected a serverless event-driven stack (Cloudflare Workers + KV cron, Instantly.ai webhooks, GoHighLevel CRM V2 API, Modal scheduled jobs) with idempotency keys, dedup KV TTL 60 days and LLM safeguards (limits, voice, fallbacks)
    - Productized monitoring & governance: operator dashboard (Vercel), /api/health endpoint, --dry-run modes on each paid path, synthetic canary → silent drift detected before impact on API credits

    Stack:
    - AI & LLM: Claude Code, Claude API, GPT-5, Gemini
    - Automation: n8n, Make.com, Cloudflare Workers, Modal
    - Mobile: React Native, Expo, EAS Build
    - Code: Next.js, Python, TypeScript, Supabase
    Claude Code Automatisation intelligence artificielle AI Automation Digital Transformation
  • Wiser Solutions
    Chef de produit IA
    November 2022 - Today (3 years and 8 months)
    Paris, France
    Conçu et déployé des capacités IA génératives en production (triage, recommandation, support client RAG, alertes intelligentes)
    avec OpenAI Assistants, Claude et systèmes multi-agents (MCP, A2A) → −40 % latence, +25 % précision, +25 % adoption
    • Défini la vision IA et la roadmap de capacités avec hypothèses de valeur, critères go/no-go et plans de rollback ; aligné 5
    équipes cross-BU (Data/AI, MLOps, architecture, sécurité, métier) sur une vision commune
    • Rédigé des PRDs orientés IA (contrats API/données, seuils d’évaluation, gestion du non-déterminisme,
    RGPD/privacy-by-design) et piloté les revues de faisabilité technique avec les équipes Data/AI
    • Orchestré le déploiement GTM mondial avec plans d’enablement et playbooks terrain → +40 % adoption BU, +30 % adoption
    utilisateur, +20 % CSAT
    • Mis en place des dashboards analytics (usage/couverture/qualité) et signaux opérationnels (drift, incidents) → +25–30 %
    précision de livraison, −25 % ambiguïté en sprint via DoR/DoD et QA pré-prod
    Gestion de produit intelligence artificielle AI Automation KPIs and Metric Definition and Monitoring Claude Code
  • InfoTnT
    Chef de Produit Technical et Data
    June 2021 - November 2022 (1 year and 5 months)
    Paris, France
    Product Discovery: Dirigé des sprints de discovery pour 3 clients B2B, en instaurant une méthodologie structurée d'entretiens utilisateurs et de cartographie Jobs-to-be-Done (JTBD), réduit les cycles d'itération de 35 % et amélioré l'adéquation solution-besoin de 25 % après lancement. Optimisation des workflows: Optimisé les flux de livraison produits pour deux clients SaaS en concevant des templates de backlog modulaires et des rituels agiles, augmentant la vélocité de 40 % et la coordination inter-équipes de 30 %. Conseil en Préparation IA: Conseillé les parties prenantes internes et les clients sur l'intégration d'automatisations légères basées sur l'IA comme support par règles, préparant des améliorations produit adoptées dans deux roadmaps clients.
    intelligence artificielle Méthode agile

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Education

  • MSc en International Strategic Business
    Toulouse Business School
    2021
    MSc en International Strategic Business
  • BE en Information Technology Engineering
    CMR Institute of Technology
    2010
    Computer Science Engineering

Certifications

  • AI Masterclass
    Outskill
    2025
    Leonardo Automatisation Make Kling ChatGPT AI Agents LLM Prompt engineering IA générative Gemini
  • Use Générative AI for SWOT Analysis
    LinkedIn
    2024
    ChatGPT Analyse SWOT LLM IA générative

Skill set

Categories