Available
Maxime Morellon
I’m a senior developer in agentic AI
Paris · remote or hybridFrench · EnglishCET (UTC+1)Freelance · 9 yrsM.Sc. HCI · ENACEx-CTO
Stack
Full-stack, with a senior front-end bar.
AIClaude Code · AI SDK · n8n
Full-stackNext.js · Supabase · Postgres
FrontReact · TypeScript · a11y
By the numbers
Nine years of building, optimizing, measuring.
9yrsexperience
150klines AI-migrated, in prod
92h/ month auto.
+37ptsWCAG accessibility
Work together
Got a project?
Open to applied-AI, full-stack and tech-lead engagements.
FormatFreelance · open to permanent
Career
Nine years, six clients
03/2026Senior Software Engineer · Agentic AI & AI-Native Development (Freelance)OCTO Technology · French central government
01/2025CTO (Freelance)Davancorp · short-term rental management
09/2022Senior React Front-end DeveloperCapgemini · French Ministry of Interior
05/2021React / Java DeveloperCapgemini · French Ministry of Armed Forces
References
Who trusted me
About
I industrialize AI, from engineering workflow to production product.
Full-stack engineer with 9 years in production, now focused on applied AI: coding agents, AI-assisted engineering workflows and products that ship LLMs.
My time as CTO taught me to ask the right questions before writing a single line of code: which process is expensive, who uses the tool, and how we measure the gain.
Front-end stays my bar for craft — React/Next.js, accessibility, performance — but it's the foundation now, not the goal.
Identity
- Name
- Maxime Morellon
- Role
- Senior Developer · Agentic AI · Ex-CTO
- Location
- Paris, France
- Citizenship
- French · Driving licence
- Languages
- French (native) · English (intermediate)
- Education
- M.Sc. HCI (ENAC Toulouse) · M.Sc. Software Eng. (Paul Sabatier)
- Interests
- AI & LLMs · Sociology · Investing · Personal growth
By the numbers
Nine years of building, optimizing, measuring.
A few figures representative of the missions I've led, from the French Ministry of Interior to a fast-growing startup.
9 yrs
of experience since 2017, with continuous React & TypeScript since 2019, after starting in Java with an Angular detour.
150k
lines of code migrated by AI-assisted workflows and shipped to production.
+37 pts
accessibility gain (from 46% to 83% WCAG) in collaboration with UX/UI and QA.
~92h
per month saved via sales pipeline automation at Davancorp.
÷2
call-back time halved after the lead pipeline rework.
115
rental units managed at Davancorp.
90%
of real-estate reports pre-filled automatically via AI on Scanorr.
352
components migrated by an AI-assisted workflow (React 16→18), with zero regression.
Stack
A stack honed by 9 years of production work.
What follows is not exhaustive: only what I've actually shipped to production with a solid level of mastery.
AI & agents
Claude CodeAGENTS.mdBMADAI SDKRAGPrompt EngineeringVision & Voice
Automation
n8nMakeTrigger.devWebhooks & APIs
Back-end & Data
Next.js (API routes)SupabasePostgreSQL & RLSJavaSpring BootStripe
Front-end & UI
ReactNext.jsTypeScriptTailwind CSSReduxZodReact Query
Testing & quality
React Testing LibraryJestCypress.ioTDDWCAG
Tools & ecosystem
GitGitHubTurborepoVercelSentryVS Code
Methods
BMADSAFeScrumHexagonal architectureTDD
References
They trusted me.
Nine years delivering on critical projects: the French Ministry of Interior, the Ministry of Armed Forces, Airbus and TotalEnergies through Capgemini, then freelance CTO, and now agentic AI for a French central government body through OCTO Technology.
French central government
OCTO Technology · since 2026- Designing agentic workflows: analyze, plan, implement, verify
- Dependency-upgrade agent wired into CI/CD, human validation
- 2 agent sets and 4 commands spread across teams, 12 lessons-learned
- 352 components migrated in ~1 month, zero regression
Davancorp
Freelance CTO · 2025- 100% AI-driven sales pipeline
- ~92h/month saved
- Call-back time halved
French Ministry of Interior
Capgemini · 2022 to 2024- Front-end React referent
- 5M+ accounts, 15k daily users
- +37 a11y WCAG points (46% → 83%)
- Front-end standards (TDD, hexagonal architecture)
French Ministry of Armed Forces
Capgemini · 2020 to 2022- Redux roll-out on a legacy app
- Mentored 2 junior developers
- Progressive refactoring without blocking shipments
Airbus
Capgemini · 2019 to 2020- Real-time aircraft progress tracking app (paint, engine tests, flights)
- Served ~100 customer managers
TotalEnergies
Capgemini · 2018 to 2019- Real-time IoT carrier geolocation
- REST APIs (Java, Spring Boot, PostgreSQL)
Path
Nine years, from junior Java to agent-assisted engineering.
A trajectory starting in full-stack Java/Angular, quickly pivoting to React, growing into seniority at Capgemini, then stepping into a freelance CTO role.
03/2026 to presentParis, France
Senior Software Engineer · Agentic AI & AI-Native Development (Freelance)
OCTO Technology · French central government
- Designing agentic workflows: explicit analysis / planning / implementation / verification stages, each with its own context, instructions and tools, plus checkpoints to review output, correct the trajectory and approve continuation.
- Dependency-upgrade agent wired into CI/CD, with human validation after the LLM analysis, built to be reused internally.
- Drove 4 simultaneous migrations in ~1 month (React 16→18, dead UI lib → mdb-react-ui-kit v10, Bootstrap 4→5, Enzyme→React Testing Library) over 26,000 lines / 350+ components: 250 files reworked, 82 test files rewritten, ~−28,000 net lines of dependencies. Second app: UI foundation migrated in 4 weeks (14,500 lines, 11 component families).
- Experimentation and measurement: tests on real cases and metric collection to assess results, surface limits and steer workflow improvements.
- Capitalization: reusable toolkit of 2 specialized agent sets and 4 commands, 12 documented lessons-learned, demos and cross-team sharing to drive adoption.
AI agentsClaude CodeCI/CDEvalsReactTypeScriptMigration
01/2025 to 12/2025Paris, France
CTO (Freelance)
Davancorp · short-term rental management
- Technical leadership of a short-term rental startup (115 units), managing 1 engineer.
- End-to-end automation of the sales pipeline (2 setters, 3 closers): lead enrichment, smart routing, email/SMS follow-up, pre-call personalized messages, dashboards → ~92h/month saved, call-back time halved.
- AI workflow deployment and prompt engineering on internal processes. Training and support across teams.
- Defined the tech roadmap and tech choices, aligning tech, budget and business objectives.
AIMaken8nGoHighLevelPabblySupabaseNext.jsPostgreSQL
09/2022 to 12/2024Paris, France
Senior React Front-end Developer
Capgemini · French Ministry of Interior
- Front-end React referent in a SAFe setup (2 trains) on RendezvousPermis, a critical application: 5M+ accounts, 15,000 users/day.
- Accessibility raised from 46% to 83% (RGAA / WCAG) working with UX/UI and QA, plus end-to-end test coverage.
- Systematic code reviews and front-end standards (component structure, TDD, hexagonal architecture) across the whole train.
- Continuous performance improvements: load-time optimization, tech-debt reduction.
- SAFe ceremonies (PI Planning, sprint planning, retros), estimation and cross-team coordination.
ReactTypeScriptNext.jsReduxJestCypressSAFeWCAG
05/2021 to 09/2022Paris, France
React / Java Developer
Capgemini · French Ministry of Armed Forces
- Brought in to fix a critical front-end performance problem: total lack of state management on a legacy app.
- Introduced and rolled out Redux across the project with progressive refactoring, without blocking deliveries.
- Mentored 2 junior developers: Redux workshops, pair-programming, ramp-up on best practices.
- Pair organization: 2 devs on new features while I tackled performance bugs and restructured legacy code.
ReactTypeScriptReduxJavaSpring BootJestRTLScrum
09/2020 to 05/2021Paris, France
Angular / Java Developer
Capgemini · French Ministry of Armed Forces
- Full-stack development (Angular + Java) in a 3-dev team.
- Designed and shipped front-end and back-end features, with unit tests securing every delivery.
AngularJavaUnit testingScrum
04/2019 to 09/2020Toulouse, France
React Developer
Capgemini · Airbus
- Built a real-time aircraft progress tracking app (paint, engine tests, flight tests) for Airbus customer managers (~100 users).
- Delivered the per-aircraft visualization timeline with alert system and multi-source data centralization.
ReactTypeScriptScrum
03/2018 to 04/2019Toulouse, France
Java Developer
Capgemini · TotalEnergies
- Built an interface for visualizing and geolocating IoT-equipped carriers: real-time trip tracking, volume estimation (liters) in trailers.
- Designed REST APIs (Java, Spring Boot, PostgreSQL) for IoT data ingestion and processing.
JavaSpring BootPostgreSQLIoTScrum