Johnny Ramananjatovo

Projects

Psychiatric hospitalisation request management platform2025 - 2026

LITDHOSPI

Functional lead of a 7-person team - ESIEE final-year project

• Scoping, backlog and GitLab code reviews. Next.js 16 / React 19 / TypeScript front end, Spring Boot back end in hexagonal architecture exposing a REST API, MySQL.
• Practitioner verification (RPPS) through an HMAC-SHA256 signed Typeform webhook and NLP matching (CamemBERT + Jaro-Winkler).
• Import of public FHIR / ANS data with Spring Batch. Clinic recommendation by multi-criteria scoring.

• Next.js 16
• React 19
• TypeScript
• Tailwind
• Spring Boot
• MySQL
• Docker
• Traefik
• GitLab CI

Source not public

Java reimplementation of the puzzle game

BabaIsYou

Developer

• Dynamic board rule engine.
• Game loop and rendering.
• Real-time exchanges over WebSockets.

• Java
• WebSockets

View demoView source

This site

whitemes.dev

Design and development

• Static Next.js 16 site, export deployed automatically on every push.
• FR / EN i18n, dark mode with no flash on load.
• SEO: JSON-LD Person, Open Graph, sitemap.

• Next.js 16
• React 19
• TypeScript
• Tailwind CSS
• GitHub Actions

Source not public

Performance debt measurement for ABAP code migrated to S/4HANA2025 - 2026

AIRA

Developer - Worldline, taken end to end to a minimum viable product

• A deterministic rule engine classifies findings and computes a debt score. A single LLM call (SAP Generative AI Hub) explains without deciding the verdict.
• Validated on a reference set of 393 findings with a replayable protocol (precision, recall, F1).
• AI layer governance: masking, copy control, confidence thresholds, audit log, human validation. Decisions documented as ADRs, pytest tests.

• Python
• Flask
• SAP BTP
• SAP Generative AI Hub
• pytest

Professional project - Worldline, source not public

Experience

1. Worldline

   September 2023 - September 2026

   SAP & AI Developer (work-study) - Payments

   • Year 3: AIRA, a tool that measures performance debt in ABAP code migrated to S/4HANA, taken end to end to a minimum viable product (Python / Flask, containerised on SAP BTP).
   • A deterministic rule engine classifies findings and computes a debt score. A single LLM call (SAP Generative AI Hub) explains without deciding the verdict.
   • Validated on a reference set of 393 findings with a replayable protocol (precision, recall, F1).
   • AI layer governance: masking, copy control, confidence thresholds, audit log, human validation. Decisions documented as ADRs, pytest tests.
   • Years 1 and 2: SAP user licence management in ABAP, then AI-assisted ABAP code review alongside an experienced developer, and SAP Integration Suite flows.

2. Institution Saint-Aspais

   September 2022 - August 2023

   Systems Developer (work-study)

   • Identity management tools in C#.
   • System administration automation (PowerShell, Active Directory).

3. Outlier AI

   2025 - 2026

   AI code benchmark curation (freelance missions)

   • Evaluation of model outputs on open-source projects.
   • Reproducible environments (Docker), automated parsing (Python, Bash).

Skills

Front-end

• TypeScript
• JavaScript
• React 19
• Next.js 16 (App Router)
• TailwindCSS
• Framer Motion
• React Three Fiber
• Responsive design
• i18n

Back-end & APIs

• REST APIs
• Java / Spring Boot (hexagonal architecture, Spring Batch)
• Python (Flask)
• C#
• ABAP
• Node.js (basics through Next.js)

Data

• SQL
• MySQL
• PostgreSQL
• Relational modelling

Quality & delivery

• Testing (pytest, JUnit)
• Documentation
• ADR
• Git
• Docker
• CI/CD (GitLab CI, GitHub Actions)
• Traefik
• Vercel
• SAP BTP / Cloud Foundry

Applied AI

• LLM APIs (SAP Generative AI Hub, OpenAI, Anthropic)
• NLP (CamemBERT, Jaro-Winkler)
• Output evaluation

Education

• ESIEE Paris

  Engineering degree in computer science

  2023 - 2026

• CNAM

  Bachelor's degree in computer science

  2022 - 2023

• Campus Saint-Aspais

  BTS SIO (two-year IT diploma)

  2020 - 2022

• SAP

  SAP Build certification (BTP100)

Contact