About Florian
Senior Backend Engineer with 5+ years of experience building and optimizing Ruby on Rails systems in production, with a strong focus on finance, data reliability and performance. I help companies secure and scale their financial reporting pipelines, improve PostgreSQL performance, and reduce infrastructure costs through pragmatic backend and database optimizations.
I have worked on data-heavy platforms, financial workflows, antifraud tooling, and ERP integrations, translating complex business rules into robust and maintainable backend solutions used daily by product, finance and operations teams. My stack includes Ruby on Rails, PostgreSQL, SQL optimization, background jobs, APIs, cloud infrastructure, and observability.
I typically contribute on backend feature development, financial and data pipeline audits, performance optimization initiatives, API refactoring, and long-term maintainability improvements, working closely with product, finance and operations stakeholders.
French
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- ShopmiumBackend developerRETAIL (SMALL BUSINESS)February 2024 - Today (2 years and 4 months)RetailTech app for cashback and promotions, helping users save money and beat inflation ⚔️- Led PostgreSQL performance and cost optimization on financial reporting pipelines (CFC), improving materialized view refresh times through a redesign of date range comparisons.- Implemented Google SSO end-to-end (design -> production), improving authentication reliability and security.- Designed and delivered the automation of invoice and payment imports from Oracle, collaborating with distributed teams (+6h) to reduce manual work and errors.- Built an Antifraud Dashboard to detect suspicious activity and improve visibility for the operations team.- Led a year-long audit of the Users API documentation (Swagger) reviewing and correcting 67 endpoints to align specs with real behavior, reduce crashes, and lower maintenance costs.- Managed the User Happiness platform migration from Helpshift to Zendesk, streamlining customer support workflows.- Migrated asset management from Paperclip to Active Storage, designing a custom S3 folder structure to extend Rails’ native capabilities and ensure long-term maintainability.- Contributed to the Wallet 2.0 project, implementing a wallet-based payment system with thresholds to reduce opportunistic behavior and increase sustainable engagement.
- CheerzBackend developerRETAIL (SMALL BUSINESS)February 2021 - February 2024 (3 years)Paris, FranceE-commerce platform for photo printing and personalized gifts 📦- Took ownership of the Photobooth project 📸, managing 100+ connected booths used during live B2C events. Balanced hardware and software (PCs, cameras, printers, tablets) and ensured smooth operation through automation and monitoring.- Standardized API endpoints across web, iOS and Android, simplifying versioning and removing obsolete code to make the system easier to scale and maintain.- Improved CI/CD pipelines and testing practices, reaching ~90% coverage, which reduced production bugs and improved the developer experience.- Contributed to the modernization of the stack: upgrade from Rails 4→7 and migration from Paperclip → Active Storage, building a multi-bucket S3 system for better efficiency and maintainability.- Set up Datadog dashboards and Bugsnag/Slack alerts, enabling faster detection and resolution of incidents.
- TiSorbetFullstack developerRESTAURANTS AND FOOD SERVICEAugust 2019 - April 2020 (8 months)Mexico, MexicoB2B food service platform, delivering on-demand frozen dessert experiences to hotels, palaces and restaurants 🍨- Fully redeveloped tisorbet.com (PHP/React), delivering a faster, more reliable and maintainable platform.- Built a reusable UI component library following atomic design principles, improving design consistency and development speed.- Integrated the backend with OVH hosting services and improved site performance with responsive web design optimizations.- Enhanced SEO and SEA readiness by optimizing site speed, accessibility, and metadata handling : ensuring better indexing and smoother ad campaigns.- Set up and managed Google Ads & Analytics integrations, supporting marketing campaigns with reliable tracking and reporting.
Recommendations
These freelancer profiles also match your criteria
Agatha Frydrych
Backend Java Software Engineer
4.7
(3)
2
Baptiste Duhen
Fullstack developer
4.6
(4)
5
Amed Hamou
Senior Lead Developer
4
(2)
7
Audrey Champion
Web developer
4.3
(3)
4
Education
- Computer and Information Sciences, GeneralThe_Hacking_Project2020Two intensive bootcamps (≈1200h in total) covering fullstack web development with a strong emphasis on Ruby on Rails, JavaScript/React, APIs and Agile teamwork 💎 - Learned algorithmics through object-oriented Ruby and JavaScript, applying design patterns and MVC principles. - Built dynamic web apps with Ruby on Rails, including API integration, hosting setup, user authentication and production deployment. - Developed frontend interfaces with HTML/CSS/JS and later advanced to React/Redux and React Native. - Delivered team-based projects using Agile methods (user stories, backlog, sprints, retrospectives). - Strengthened collaboration with Git/GitHub workflows (branches, merges, conflict resolution). - Completed a final group project simulating real-world product development from design to delivery.
- Master's degree Creative CommunicationsUAL - London College of Communication2017Developed expertise in brand storytelling, PR, event design and cultural media analysis during a Master’s in Creative Communications at University of the Arts London.