Florian Lefevre

Blue Whale is the leading French apple exporter (founded in 1950, nearly 300 producers, ~€300M in revenue).

Its operations are supported by a central agricultural ERP, used by about fifty employees.

Tech Leadon this ERP, in a complex legacy context. Stack: Angular, Java/Spring 2, 23 PowerBuilder applications, Oracle 9, aging infrastructure.

- Operationalleadershipof 3 senior full-stack developers, sprint organization, and technical arbitration.

- Structured code reviews, promotion of best practices, andresponsibility for technical choicesand their evolution.

- Collaboration with product management: estimations, prioritization, batching, and delivery assurance.

-Incremental modernizationof the legacy system without service interruption: migration from Angular 15 to 21, DevExtreme update, and progressive transition to Angular Material.

- Introduction ofNgRxto stabilize complex application flows.

- Structuring decisions: exploration of the migration path for the 23 PowerBuilder applications to NestJS, then refocusing the scope with management.

- **Quality reinforcement**: strict TypeScript, strict ESLint, Prettier, Stylelint, and shared conventions.

-Nx standardization(schematics) to harmonize practices and prepare for future Angular/NestJS applications.

- Code unblocking and **CI/CD**, progressive reduction of technical debt.

- **Perceived display speed increased by approximately 50%**, improved user and developer experience.

-Reduced future risk and cost of evolutionthrough the Angular 15 to 21 migration and standardization of the core.

-Maintained delivery continuityduring technical work.

-Reduced dependency on legacy systems and individual knowledgethrough more standardized code.

Joorney: American company providing business plans for immigration cases (EB-5, E-2, L-1 visas), ~300 business plans/month, 120+ sectors.

Hands-on Engineering Managerfor the entire application scope (~100 employees).

Technical context: Angular, NestJS, Nx, PHP, Node.js, Python, AWS.

-Design of an ecosystemthat evolved from one legacy application to 6 business applications.

- Deployment of the financial application, then industrialization of the writing tools.

- Integration ofPython AI modules(review, correction, inconsistency detection) and synchronization with Microsoft, Google, HubSpot, Wrike.

- **Hands-on technical ownership**: POCs, architectural choices, API integrations, migration from Symfony/PHP to Nx/NestJS.

- Standardization with Nx,strict TypeScript**, and ESLint; **CI/CDand migration from Bitbucket to GitHub; initial use of **GitHub Copilot**.

-Product / Data / Techarbitration with the CPO; company-wide decision on the collaborative suite.

- Structuring an international team from 3 to 7 developers (5 hires, 2 squads).

- Recruitment, onboarding, individual and annual reviews, **offboarding management**, and asynchronous intercultural management.

-Increased production capacitythrough progressive industrialization of manual or scattered processes.

- **Reduced dependency on historical tools and individual knowledge**, ecosystem mastered by the entire team.

- **Improved data quality and reliability**, reduction of production errors.

-Enhanced company's ability to launch and maintain new servicesthrough a shared NestJS/TypeScript foundation.

-Reduced employee turnoverthrough more reliable tools.

Kaliz is a proptech company specializing in rental property management. Founded in late 2019, raised over €22M, managing tens of thousands of units. Operations are driven by a central business application.

Tech Lead Angularfor this critical application (CRM, leases, billing), serving around thirty employees. Foundation: Nx monorepo, ~80,000 lines of TypeScript, 650+ components.

-Technical responsibility for the frontendwith 4-5 developers, with the CTO's trust on all frontend issues.

- Structured code reviews, coaching, Angular/RxJS best practices, and technical arbitration.

- Definition of the **frontend roadmap**: prioritization of technical debt and architectural choices.

- Facilitation of Agile rituals and collaboration with product management.

- Introduction of **NgRx**: single source of truth, clarity for complex business logic, fewer backend calls.

- **Nx and schematics standardization**: reliable recurring components and version upgrades.

- Delivery assurance:SwaggerAPI contracts and GitLab CI/CD.

- E2E tests withCypress / Playwrighton key user flows.

-Code audit and progressive improvementof the foundation, without service interruption.

- Refactoring, complex components, and significant business evolution.

- Transition to **strict TypeScript**, strict ESLint, Prettier, and development conventions.

-Ability to evolve the critical applicationthrough progressive reduction of frontend technical debt.

-Reduced regression riskon sensitive business flows through E2E test automation.

-Better-defined business requirements before developmentthrough enhanced collaboration with product management.

-Increased team autonomyon Angular, RxJS, code review, and common technical arbitration.