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Full stack engineer with 10+ years of commercial software development experience} and a proven track record of successfully delivering projects as a contractor for clients across various industries for the past 6 years. A fast learner and adaptable polyglot developer, comfortable working with different tech stacks and taking on different roles to contribute effectively across the entire software development lifecycle.…Full stack engineer with 10+ years of commercial software development experience} and a proven track record of successfully delivering projects as a contractor for clients across various industries for the past 6 years. A fast learner and adaptable polyglot developer, comfortable working with different tech stacks and taking on different roles to contribute effectively across the entire software development lifecycle.

Alexis Chantreau Majerus

Full Stack Developer, Back-End Developer, Front-End Developer, +2

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Full stack engineer with 10+ years of commercial software development experience} and a proven track record of successfully delivering projects as a contractor for clients across various industries for the past 6 years. A fast learner and adaptable polyglot developer, comfortable working with different tech stacks and taking on different roles to contribute effectively across the entire software development lifecycle.…Full stack engineer with 10+ years of commercial software development experience} and a proven track record of successfully delivering projects as a contractor for clients across various industries for the past 6 years. A fast learner and adaptable polyglot developer, comfortable working with different tech stacks and taking on different roles to contribute effectively across the entire software development lifecycle.

Available to hire

Full stack engineer with 10+ years of commercial software development experience} and a proven track record of successfully delivering projects as a contractor for clients across various industries for the past 6 years. A fast learner and adaptable polyglot developer, comfortable working with different tech stacks and taking on different roles to contribute effectively across the entire software development lifecycle.

Skills

Experience Level

Expert

Expert

Expert

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Expert

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Expert

Language

English

Fluent

Work Experience

Senior Full Stack Engineer at Sentry Interactive

May 1, 2025 - Present

Engaged as the sole developer to design and build an automated billing system from scratch for the company's SaaS product. Worked closely with the CTO and Head of Product to gather requirements and architect the solution.

Senior Software Engineer at SiriusXM

February 1, 2024 - January 31, 2025

Rebuilt legacy data ingestion systems and designed a new cloud-based ETL pipeline on AWS capable of processing batch and real-time XML automotive data from hundreds of providers, handling millions of transactions daily and reducing processing time from hours to minutes.

Senior Java/Scala Developer at Coremont

June 1, 2023 - February 29, 2024

Worked on a cloud-based portfolio management product, building a highly performant and scalable pipeline to ingest millions of trades and portfolio data; enhanced ingestion and processing for exotic derivatives; developed asynchronous APIs for real-time trade reprocessing and automated data enrichment.

Java/Scala Developer at HM Revenue & Customs

November 1, 2022 - June 30, 2023

Contributed to the Digital Contact team within the Multi-channel Digital Tax Platform (MDTP); maintained and developed services for digital communications delivery, email rendering and customer communication preference management; led upgrades to Java 11 and Scala 2.13 and mentored junior developers.

Full Stack Engineer at Holland & Barrett

March 1, 2022 - September 30, 2022

Backend and frontend work for in-store till system; built a TCP server to emulate a card machine for testing payment flows and automated bulk configuration updates for hundreds of till config files.

Full Stack Engineer at Sedex

June 1, 2021 - March 31, 2022

Built a new in-house online ethical data exchange platform; frontend components and backend systems to improve onboarding and provide a dashboard; led payments integration by designing an API, database schema, queues, and provider integration.

Full Stack Engineer at Springer Nature

November 1, 2019 - May 31, 2021

Built a new editorial management system, improving the experience for authors, editors and reviewers from submission through peer review to acceptance; scaled from one journal to dozens.

Backend Engineer at Adevinta

March 1, 2019 - October 31, 2019

Sole backend developer to finalize development of a suggested ads API; containerized the application, migrated deployments to Kubernetes, and added monitoring, documentation and scripts to aid local development before handover.

Full Stack Engineer at OVO Energy

September 1, 2014 - October 31, 2018

Contributed to early digital transformation; built the smart meter booking platform and the first UK online top-up product; recognized for innovation and impact.