You're seeing this page as if you were . The main menu is still yours, though. Exit from immersion
Thomas DiaconuTD

Thomas Diaconu

Software Engineer, Agentic AI & Modernization

€650/day
Paris, FR
3-7 years

Average response time: 1 hour

About Thomas

Vous cherchez un ingénieur logiciel capable de développer vos applications, moderniser vos systèmes legacy, ou intégrer l'IA agentique dans vos produits ?

5 ans d'expérience, dont 3,5 ans chez AWS sur des projets de transformation cloud pour de grands comptes. Je vous aide sur :

  • Développement logiciel : applications full-stack (Python, TypeScript, Java, React/Angular), architecture cloud AWS, sécurité (IAM, KMS).
  • Modernisation legacy : migration de systèmes critiques (PL/I, COBOL, AS/400) vers le cloud, avec l'IA générative pour accélérer sans perdre en qualité.
  • IA agentique : conception d'agents IA (RAG, MCP, workflows agentiques) pour automatiser vos processus techniques.
Ce qui me différencie : des résultats concrets et chiffrés — 41 programmes PL/I remplacés par un microservice unique, framework de validation livré en 3 jours au lieu de 4 semaines, plateforme de 5M+ lignes de code coordonnée en équipe.

Full remote, présentiel, haut niveau d'autonomie et d'exigence qualité.
  • French

    Native or bilingual

  • English

    Fluent

  • Romanian

    Native or bilingual

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

Experience

  • Amazon Web Services (AWS)
    Software Engineer II
    January 2023 - Today (3 years and 6 months)
    Paris, France
    - Contributor and practitioner of AWS’s standardized Reimagine approach (reverse engineering with AWS Transform, forward engineering with Kiro/AI agents) to modernize legacy mainframe applications into cloud-native microservices; designed and delivered an internal workshop (26 slides) to train the team on the methodology.
    - Use case: end-to-end modernization for a major automotive OEM – 41 PL/I programs (12K business rules) replaced by a single Java/Quarkus microservice.
    - Capture-Compare-Remediate validation framework (MCP): 16/16 scenarios validated in 3 days vs. a 4-week target, 512 tests passing, byte-for-byte parity with the legacy system.
    - Technical lead for a 10-developer team on a 5M+ line codebase (COBOL to Java + Angular): technical coordination, quality standards definition, code reviews; remediated 300k+ SonarQube findings, cut critical latency from 30s to <1s through SQL optimization (validated for 10,000 concurrent users with JMeter) – resulting in a client contract extension.
    - Independently built GenAI productivity tools from recurring needs identified across projects, deployed on AWS Transform: SonarQube fixer (1,500 issues / ∼ 1h), Playwright generator (∼ 500 E2E tests), semantic deduplication pipeline (Titan + Claude Haiku).
    - Independently led an internal AppSec review (STRIDE threat model, IAM controls, KMS encryption) on an isolated production environment handling sensitive customer code.
    - Contributed to the BluAge runtime, a nearly 20-year-old product used to modernize mainframe systems: multi-tab session isolation and jQuery dependency removal – reflecting the platform’s continued adaptability.
    Python AWS Agentic AI Legacy Modernization
  • Paprec
    Software Engineer
    ENVIRONMENTAL
    September 2021 - December 2022 (1 year and 3 months)
    Paris, France
    - Led the development of the new internal payroll software using Angular & Go
    - Developed a calculation engine using Python to automate the computations of employees wages
    - Built a tool for image annotation & waste prediction (Angular & Python Flask)
    - Leveraged Docker server-side to containerize Frontend and Backend to allow for easy deployment and scalability
    Python intelligence artificielle Angular
  • Sopra Banking Software
    R&D Engineer Intern
    February 2021 - August 2021 (6 months)
    Paris, France
    Worked in the innovation department as part of my master thesis (grade: 17/20).
    - Built a dataset and implemented several Machine Learning models for investment advice & profiling
    - Built, extended and optimized REST API endpoints for an online banking
    - Set up a HTTPS reverse proxy in a Linux containerized environment with NGINX, Docker and AWS
    Python Angular

Recommendations

Be the first to recommend Thomas

Help this freelancer shine by sharing your experience working together.

These freelancer profiles also match your criteria

AgathaA

Agatha Frydrych

Backend Java Software Engineer

4.7

(3)

2

BaptisteB

Baptiste Duhen

Fullstack developer

4.6

(4)

5

AmedA

Amed Hamou

Senior Lead Developer

4

(2)

7

AudreyA

Audrey Champion

Web developer

4.3

(3)

4

Education

  • Engineering degree, Data
    EURECOM
    2021
    Engineering degree, Data
  • Engineering degree
    IMT Atlantique
    2021
    Engineering degree

Certifications

Skill set

Categories