Romain MASCLEF

• Led and scaled cross-functional product & engineering teams (up to 20+ engineers) to support business growth and strategic pivots.
• Designed and implemented team structures, delivery processes, and rituals to support agility, ownership, and accountability.
• Actively contributed to system design, code reviews, and architecture decisions to ensure alignment between tech and product vision.
• Partnered closely with Product, Design, and Business to co-define roadmaps and translate strategy into execution.
• Drove continuous improvement initiatives in velocity, quality, and team autonomy.
• Took part in company-wide org design efforts, helping shape a scalable, collaborative, and outcome-driven tech organization.
• Acted as a cultural leader and change agent during phases of transformation, uncertainty, and reorganization.
• Balanced operational delivery with strategic input at the leadership level.

• Led the strategic cloud migration from Azure to AWS, prioritizing security, scalability, and cost-efficiency; achieved 95% infrastructure coverage via Terraform (Infra-as-Code) while aligning with the AWS Well-Architected Framework.
• Successfully delivered the migration of the internal CRM to Salesforce, improving sales workflow efficiency and reporting capabilities.
• Replaced Aircall with AWS Connect, launching a scalable, customizable call center solution, reducing telephony costs by 40%.
• Actively supported the creation of a new product team, driving the definition of its scope, delivery process, and its alignment with tech strategy.
• Scaled up Data Engineering, Infrastructure, and Backend teams by +60%, improving autonomy and delivery throughput.
• Mentored engineers and product managers across disciplines: Backend, Infra, Data Engineering, Data Science, and Product, supporting career development and cross-functional alignment.
• Designed and implemented ETL pipelines with the Data Engineering team and exposed business KPIs through Tableau dashboards, enabling real-time data-driven decision-making.
• Worked closely with product and leadership teams to ship fast, reliable solutions with measurable business impact.
• Conducted security audits and enforced compliance policies in line with Société Générale’s acquisition requirements, ensuring regulatory alignment.
• Reduced overall tech spend by identifying infrastructure optimizations and rationalizing tool usage across teams.

• Took over a critical tech leadership role during a team crisis, with 100% of Backend & Data teams and 50% of Infra & Frontend teams resigning; led the rebuild of the backend and infra teams from scratch, stabilizing operations in under 3 months.
• Assessed and revamped a fragile backend codebase, reducing error rates and improving system reliability through systematic refactoring, clean architecture adoption, and rigorous code reviews.
• Redesigned the global backend architecture using Domain-Driven Design (DDD) and Clean Architecture, transforming a brittle, RPC-style event system into a business-oriented event-driven architecture, significantly improving decoupling and domain clarity.
• Migrated and modularized legacy codebase to align with new architectural principles, reducing bugs by 95% and improving developer onboarding and autonomy.
• Defined and introduced agile processes tailored to tech team maturity and business cadence, iterating through models to find the most effective delivery flow.
• Led technical strategy for data enrichment pipelines, supporting ingestion, classification, and real-time updates across millions of car ads from multiple sources.
• Introduced backend and data observability standards using Datadog, improving incident response time by 50% and enabling proactive issue detection.
• Oversaw infrastructure modernization efforts, solving scalability issues, reducing Kafka and network outages, and introducing containerization for frontend and data apps.
• Delivered key features tied to business objectives while maintaining a strong focus on system health, uptime (SLA), and long-term cost efficiency.
• Partnered with business teams to expose product and operational metrics, helping improve decision-making with concrete, reliable data.
• Mentored engineers across backend, infrastructure, and data domains, fostering a culture of ownership, code quality, and continuous improvement.

• Contributed as a core backend developer to TF1’s large-scale digital transformation, supporting multiple strategic initiatives across web, mobile (iOS/Android), and IPTV platforms (Free, SFR, Bouygues, etc.).
• Took part in the complete redesign of backend services, building modular, high-performance APIs in Go to support the new generation of front-end applications and editorial tools.
• Rebuilt the internal CMS from scratch in 3 months, enabling editorial teams to easily manage, schedule, and publish content across e-TF1 platforms—significantly improving productivity and autonomy.
• Helped migrate infrastructure from on-premise data centers to AWS, improving scalability, resilience, and deployment flexibility; contributed to infrastructure-as-code practices.
• Collaborated with cross-functional teams to align backend capabilities with editorial and product needs, enabling new features such as personalized content, live streaming, and VOD.
• Designed and implemented performant, testable, and maintainable services with a focus on clean interfaces and scalability, helping support millions of monthly users.
• Worked within a multi-team agile environment, actively participating in the improvement of inter-team collaboration, documentation, and delivery workflows.
• Delivered new backend features with a strong emphasis on reliability and observability, contributing to a 30% reduction in incidents during peak traffic periods.
• Participated in internal knowledge sharing and code review practices, helping spread Go best practices across newly formed backend squads.

• Led the modernization of ETS Global’s legacy monolithic back-office CRM, transitioning to a microservices architecture using Symfony 3/4 and Domain-Driven Design to improve maintainability, scalability, and developer velocity.
• Introduced an event-driven architecture for handling asynchronous workflows, leveraging RabbitMQ and SwarrotBundle, which reduced latency for background processing tasks by 40%.
• Rebuilt service observability by implementing Elastic Stack (ELK) for application logs and Prometheus + Grafana for service monitoring, enabling real-time diagnostics and proactive incident handling.
• Contributed to the complete revamp of the public-facing front office application, including:

- Migrated from EzPublish to Prismic.io for CMS flexibility

- Migrated from Symfony 2 / Twig to React to modernize the frontend stack

- Implemented GraphQL server to simplify and optimize client-side data needs

- Enabled internationalization for global markets using Localize.biz

- Deployed services on Google Cloud Platform (AppEngine, Cloud Storage) to reduce infrastructure management overhead

• Designed and maintained robust CI/CD pipelines using Jenkins and Ansible, improving deployment speed and reducing manual errors.
• Configured and maintained infrastructure components on AWS, including S3, EC2, ElasticSearch Service, and Lambda, enabling flexible, cloud-native operations across dev, test, and demo environments.
• Supported engineering best practices through code reviews, architectural discussions, and cross-team collaboration, contributing to faster time-to-market for new features.

• Supported multiple clients as a software consultant, with a strong focus on modern development practices, team structuring, and code quality improvements across PHP/Symfony and Node.js projects.
• Trained client teams on Agile methodologies (Scrum, Kanban) and facilitated their adoption through practical coaching, backlog grooming, sprint planning, and retrospective facilitation.
• Promoted SOLID principles, PSR standards, and clean code practices, significantly improving maintainability and consistency across project codebases.
• Introduced and helped institutionalize continuous integration / continuous deployment pipelines, leveraging tools like GitLab CI, Jenkins, and Deployer to reduce release times and increase delivery confidence.
• Conducted code reviews, unit testing, and functional testing workshops, helping teams embed testing as part of their regular delivery process.

• Led the development of a custom ERP system using Symfony 3 / PHP 7, following open-ERP principles to support tailored business workflows and internal operations.
• Designed a scalable and maintainable system architecture, enabling modular growth and better alignment with evolving business needs.
• Set up a complete CI/CD workflow using GitLab CE and Deployer, automating deployment across development, qualification, and production environments.
• Provisioned and maintained infrastructure on Debian Jessie servers, including configuration of Apache, PHP packages, MySQL, and essential system services.
• Improved deployment reliability and reduced manual errors, supporting continuous delivery and faster iteration cycles for internal stakeholders.

• Developed and maintained a web application and RESTful API using AngularJS and Node.js, supporting internal operations during high-traffic international football events.
• Designed scalable, maintainable backend services to ensure high availability and performance, handling thousands of daily requests with minimal downtime.
• Trained and mentored internal development teams on robust coding practices, including modular code structure, defensive programming, and testing strategies.
• Promoted best practices in JavaScript, including linting, documentation, unit testing, and adherence to code style guides, improving long-term code quality.
• Helped improve team efficiency and reduce bug rates by embedding code reviews and encouraging a culture of technical excellence and collaboration.

• Took over and maintained existing projects for Rapidflyer, ensuring business continuity while progressively modernizing the stack and reducing technical debt.
• Designed and developed multiple new microservices using the SLIM micro-framework, improving modularity and reducing the time to deliver new features by 50%.
• Led the architecture and design of a new B2B logistics platform, focused on managing product shipments efficiently across multiple channels.
• Developed a custom B2B web application under CodeIgniter, inspired by the core logic of rapidflyer.com, tailored for professional use cases and order flows.
• Integrated Symfony / SensioLabs components (e.g., Pimple) into the CodeIgniter codebase to bring it closer to modern PHP standards and better enforce SOLID principles.
• Facilitated team training on SOLID principles, agile methods, CI/CD workflows, and software design best practices—boosting developer velocity and code quality.
• Helped set up lightweight CI/CD pipelines to streamline deployment and testing workflows, reducing production delivery time and improving reliability.

• Maintained and continuously evolved critical customer relationship, prospecting, and remote control platforms, supporting thousands of daily users and directly impacting customer satisfaction and operational efficiency.
• Ensured reliability and performance of development environments through regular updates and environment standardization across teams, reducing onboarding time and environment-related bugs by 25%.
• Designed and implemented a robust, centralized EventStore architecture to improve inter-service communication and event consistency across the company’s distributed systems.
• Developed custom drivers in PHP, Node.js, and Java to interface with the EventStore, enabling all legacy and new applications to publish/consume events in a standardized and monitored way.
• Enabled clustering and high-availability monitoring, supporting better fault tolerance and improving uptime for critical business services.
• Supported application teams in the integration of the new event-based system, contributing to better scalability and traceability across the platform ecosystem.

• Led the complete redesign of the internal CRM using Symfony 2, evolving it into a microservices-oriented architecture to modularize pricing, costing, and production logistics.
• Delivered a scalable system enabling the dynamic management of manufacturing and transport lead times, resulting in a 20% improvement in quote accuracy and operational responsiveness.
• Designed and implemented a custom ETL (Extract, Transform, Load) system, enabling reliable data synchronization and flow between multiple frontend and backend applications.
• Integrated a Node.js-based internal event manager to orchestrate real-time communication between ETLs, microservices, and third-party tools—reducing inter-service latency and manual reconciliation.
• Enabled business teams to adapt prices and production planning in real time, directly contributing to improved customer experience and supply chain agility.
• Facilitated smoother collaboration between dev teams by introducing standardized interfaces and documentation across services, accelerating feature delivery by ~30%.

• Participated in the definition and drafting of technical specifications for key internal projects related to the e-commerce back-office, collaborating closely with product owners and business analysts.
• Contributed to the development of several core back-office features, supporting product catalog management, order processing, and logistics flows.
• Implemented comprehensive unit and integration tests, helping to reduce production bugs by ~40% and improve overall system stability.
• Ensured ongoing maintenance and patching of critical production applications, including hotfixes and performance optimizations, minimizing downtime and supporting 24/7 operations.
• Collaborated within an Agile team to meet strict delivery deadlines and maintain high code quality, contributing to the seamless management of thousands of SKUs and daily e-commerce operations.

• Contributed to the development of onboard/track communication systems for train networks, focusing on the integration of Web Services to enable real-time data exchange between onboard systems and ground infrastructure.
• Analyzed and documented the existing suite of Bombardier’s proprietary Web Services, identifying integration points and improving clarity for future system expansion.
• Developed and deployed client Web Services in Java and PHP, used in embedded systems, ensuring consistent and reliable connectivity in operational train environments.
• Designed and executed test plans for the onboard/track interface, validating data reliability, latency, and failover scenarios, contributing to enhanced communication system robustness.
• Built a dynamic reporting web application to visualize test results and integration progress, streamlining communication across engineering and QA teams.
• Created a step-by-step tutorial for deploying Bombardier’s client Web Services in both Java and PHP, improving developer onboarding and accelerating project ramp-up time by ~40%.
• Collaborated with cross-functional teams in a highly regulated industrial environment, gaining exposure to transport safety standards and embedded software constraints.