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

Raphaël Kolm

Software Engineer (web full-stack, cloud, data)

€680/day
1 project
Paris, FR
8-15 years

Average response time: 1 hour

About Raphaël

💪 Strengths
  • Building web products end-to-end. Full-stack delivery of MVPs and later iterations, running production, including performance and reliability concerns.
  • Product/UX sense. Comfortable with scoping, capturing/writing specs, building stakeholder consensus, detail-obsessed when needed.
  • Modernize legacy systems. Reduced complexity and technical debt on running systems while keeping delivery moving. Also led large rewrite programs.
  • Build & scale teams. Hands-on hiring and onboarding, crafting lightweight processes that actually help team cohesion.

👀 Looking for
  • Preferred sectors: Energy, Mobility
  • Areas: France, Benelux, London, Barcelona, Switzerland. Up to 1 week/month out of Paris.

🛠️ I’ve worked on:
(Mostly built from scratch with teams of 3-6 contributors)
  • B2C web platforms. Marketplace with UX, SEO and performance constraints. Web-based mobile apps.
  • Back-Office System mixing automation workflows, complex pricing modelling, internal CRM, messaging.
  • Cartography/Modelling SaaS. User interface for urban planners built around a map, drawing features, complex data entry for physics modelling.
  • Backend-to-Backend Integrations
  • Industrial Supervision / IoT
  • Analytics / Business Intelligence systems

🤖 Key Tech Experience:
(Happy to hop on any similar stack!)
  • Web backend: Python, FastAPI, Flask, SQLAlchemy, Postgres
  • Web frontend: TypeScript, Vue, Angular, Vanilla JS
  • Data: Advanced SQL, Pandas, DBT, Metabase
  • CI & Deployment: AWS, Docker, Kubernetes, GitHub/GitLab, Datadog, Sentry
  • AI: Claude, Mistral
  • No-code: Notion (power user), n8n
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Paris (up to 50km), Lyon (up to 10km), Bordeaux (up to 10km), Lille (up to 10km), Nantes (up to 10km)

Experience

  • Electra
    Engineering Manager
    ENERGY AND UTILITIES
    November 2025 - March 2026 (4 months)
    Paris, France
    EV Charging Point Operator

    - Topics: in-house supervision system of an industrial IoT fleet, B2B integration with resellers, high-volume data flows (+200 GB/day)
    - Tech: Ruby on Rails, Go, Postgres, AWS (ECS, Athena), Datadog, Omni, DBT, Snowflake, Cursor, Claude Code. Mix of stable, phasing-out legacy and emerging systems.
    - EV ecosystem standards (OCPI, OCPP)
    - Managing a team of 5 engineers. Channelling/buffering high pressure.
    Metabase GO OCPI
  • Efficacity
    Lead Software Engineer
    ARCHITECTURE AND URBAN PLANNING
    October 2023 - October 2025 (2 years)
    Champs-sur-Marne, France
    Revamp a SaaS for urban planning engineers. Leading a team of 5 engineers with a transverse tech+product+roadmapping role.
    Vue.js Django Scaleway Kubernetes Leaflet
  • Joy / Privateaser
    Co-founder & CTO
    ENTERTAINMENT AND LEISURE
    September 2014 - May 2023 (8 years and 8 months)
    Paris, France
    "Rendre l'organisation d'un évènement dans un bar/restaurant aussi simple qu'acheter un billet de train"

    Rôles :
    -Co-fondateur :premiers prototypes produit, expérimentations de vente, marketing et opérations, calibrage du modèle économique, premiers recrutements, au contact des enjeux de financement, levées de fonds et animation du board.
    -Premier développeur :création de la marketplace, de l’app de gestion et d’un back-office + infrastructure de production, data et outils de développement.
    Technologies principales : Vue, Angular, Python, MySQL, AWS.
    -Recrutement et management d’une équipe de 15 ingénieurs.Mise au point des fiches de poste, career paths, formations, et du processus de recrutement (900+ candidats suivis). Organisation agile et méthodes de gestion de projet.
    - Ouverture de la fonctionProduct(conception fonctionnelle, maquettes, interfaces, recherche utilisateur) puis recrutement de Product Managers et Product Designers.
    -Data AnalystetData Engineer
    -Leadership technologique :architecture, vision, roadmap technique.

Reviews

5,0

Out of 1 rating

SixtineS

Sixtine

Kolverr

Reviewed on 06/02/2024

Raphaël accompagne Kolverr dans sa stratégie & ses choix liés au software. Il a une excellente capacité d'analyse qui lui permet de donner un avis construit, argumenté, et nuancé ; et une compréhension fine des enjeux d'architectures et de choix technologiques qui nous aide à nous orienter dans la bonne direction. Il nous aide à prendre un recul nécessaire sur des sujets aussi variés que l'arbitrage entre deux frameworks ou les recrutements dans l'équipe tech, tout en comprenant les enjeux d'agilité et de rapidité d'une startup à notre stade de développement. En plus de cela, c'est très facile de travailler avec Raphaël, il a une approche posée et rassurante et une très bonne communication.

Recommendations

Be the first to recommend Raphaël

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

  • Diplôme d'ingénieur, Systèmes d'information - Entrepreneuriat
    Ecole Centrale Paris
    2014
    Diplôme d'ingénieur, Systèmes d'information - Entrepreneuriat

Skill set

Categories