Erwan Leboucher

Goodvest is an investment platform focusing on sustainable and ethical investment options.

• Implemented comprehensive monitoring and alerting system using OpenTelemetry, leading to 50% reduction in API response times through data driven optimizations and proper database indexing

• Led Kubernetes infrastructure planning and initial implementation to improve system scalability and reliability

• Engineered real-time user tracking solution integrating Segment and PostHog across frontend and backend systems, enabling data-driven product decisions

• Established end-to-end testing framework using Playwright, significantly improving application stability and reducing regression bugs

• Coordinated cross-functional team efforts to modernize legacy components while maintaining system stability

Technologies: Python, Django, Vue.js, Kubernetes, PostgreSQL, GitLab CI/ CD, AWS, Segment, PostHog, Playwright, OpenTelemetry, Prometheus

Wolt is a food delivery application operating in 29 countries, with more than 140,000 restaurants and more than 45 million users.

- Led architecture and development of a high-performance audience builder tool (Golang backend, React frontend) used by 320+ marketing managers for creation and export of targeted audiences to third-party ad networks

- Optimized near real-time data pipeline processing 500M+ rows daily; designed event-driven architecture with Kafka streams to distribute audience data to DynamoDB, PostgreSQL and third-party integrations, achieving 30x faster speeds, 67% cost reduction, and 100x scalability

- Integrated DynamoDB for sub-10ms query responses in the audience builder, enabling fast audience filtering and providing real-time eligibility checks for the ordering system's promotion feature

- Developed data visualization dashboards with Python (FastAPI) providing insights into audience segments and marketing campaign performance

- Directly managed project requirements and roadmap with marketing stakeholders, while coordinating integrations with multiple engineering teams to ensure seamless data flow between systems, resulting in more effective targeted campaigns

Technologies: Golang, Python (FastAPI, Airflow), React, PostgreSQL, Snowflake, DynamoDB, S3, Kubernetes, Kafka

viafintech is a payment service provider. Through viacash, they offer a solution for cash deposits, withdrawals and payments for clients like N26, bunq, Amazon.de in retails such as DM, Rewe, Penny.

- Integrated multiple external transaction API such as Alipay or Incomm (gift cards) using Golang. Enabling the user to use these services at a retail.

- Designed and developed an iOS and Android application to find the nearest retail partners with React Native and Typescript.

- Engineered a new deployment system written in Golang, affecting 60+ services. Integrated using Golang and Bash with Docker, GitLab, AWS S3 and Vault. Reducing the deployment time by 95%.

- Mentored new team members, accelerating their onboarding process and bringing them up to speed on project specifics, codebases, and best practices.

Technologies: Golang, React / React Native, PostgreSQL, RabbitMQ