Guillaume Jensen

Experience

AVIV Group — Senior Software Engineer (Dec 2023 - Present)

European real estate marketplace (SeLoger, Immoweb, Immowelt).

  • Work on serverless event-driven platforms for contract management across European markets.
  • Contribute to architecture decisions within a collaborative team environment.
  • Develop Lambda functions orchestrated via Step Functions for contract workflows.
  • Build event-driven architecture with DynamoDB Streams for change data capture, providing S3 state snapshots for downstream consumers and audit trails.
  • Write reusable Terraform modules for ephemeral and production environments.
  • Integrate with various systems: legacy SOAP services, REST APIs, RabbitMQ.
  • Help establish testing practices: unit tests, BDD E2E scenarios, load tests.
  • Collaborate with Product to understand business context and priorities.
  • Stack: TypeScript, AWS (Lambda, DynamoDB, SNS/SQS, Step Functions), Terraform.

Squadeasy — Backend Developer (Jul 2023 - Nov 2023)

B2B wellness and gamification app for employee engagement.

  • Rewrote activity tracking component in Rust to improve performance.
  • Maintained TypeScript backend services.

PayFit — Software Engineer (Nov 2022 - Feb 2023)

HR and payroll SaaS platform for European SMBs.

  • Worked on JetLang, an internal DSL for payroll rule automation.
  • Collaborated closely with Product and Engineering Manager in a small backend squad.
  • Stack: Node.js, TypeScript, AWS, CircleCI, Datadog.

Frichti — Software Development Engineer (Nov 2021 - Nov 2022)

Food delivery startup in Paris.

  • Maintained backend services for customer products and internal tools.
  • Built features like "Frichti TV" (TikTok-style recipe feed with content tracking for mobile and web).
  • Worked in a cross-functional squad with frontend, mobile, and backend engineers.
  • Stack: Node.js, TypeScript, PostgreSQL, AWS, Kubernetes (EKS), RabbitMQ.

AB Tasty — Backend Engineer (May 2021 - Oct 2021)

A/B testing and feature flagging platform.

  • Improved JavaScript SDK performance for client-side A/B testing.
  • Stack: TypeScript, Webpack, AWS Lambda.

Oyez — Lead Developer (Mar 2018 - May 2021)

Digital agency focused on e-commerce for retail brands.

  • Contributed to microservices rebuild for Monoprix e-commerce platform.
  • Participated in architecture discussions and technical planning.
  • Coordinated delivery with small developer teams; helped with client proposals.
  • Obtained Google Associate Cloud Engineer certification during this period.
  • Stack: Node.js, React, GCP, Kubernetes.

southpigalle — Software Developer (Jun 2017 - Mar 2018)

Conversational AI agency.

  • Built bot infrastructure and NLP services with Node.js.
  • Started as intern, transitioned to full-time.

Earlier Experience (2013 - 2017)

  • HEC Paris Startup Launchpad — Entrepreneurship program (2017)
  • ALD Automotive — IT Intern (2016)
  • Real Estate — Property advisor, Paris (2013)

Education

  • Ecole 42, Paris — Software engineering (2014 - 2017)
  • Universite Paris Ouest Nanterre La Defense — Law studies (2010 - 2012)
  • Baccalaureat Litterature & Languages, Lycee Albert Camus, Bois-Colombes (2009)