Cove Marquis

Senior full-stack blockchain developer

I build secure product applications and tooling across the full-stack. With a strong focus on product research and development and delivery quality. I value team collaboration and process improvement. Most recently, I worked on blockchain tooling and full-stack product engineering at OpenZeppelin.

Expertise

  • Engineering

    Built full-stack applications on AWS-backed services, and CI/CD pipelines.

  • Product

    Led architecture, MVP scope, user research, and product-market fit decisions.

  • Team

    Owned onboarding, facilitated Scrum, mentored developers, and improved daily workflows across delivery teams.

Selected work and learning experiences

Worked with

  • OpenZeppelin
  • Aldo Group
  • Next AI
  • Centech
  • Le Wagon
  • LCI Education

Learned from

  • Professional Scrum Master I
  • Professional Scrum With Kanban I
  • Certified Ethereum Developer
  • Product Ownership Linky

Mentored for

  • QueerTech Montreal
  • Circonflex

How I Work

svg lead

Team
& Delivery

As a lead developer and a scrum master, I have learned to orient individuals and spread knowledge to empower the team and strengthen its effectiveness supporting the project's goals for continuous improvement. Stronger team flow and steady execution delivery.

svg polyvalent

Platform
& Product

I work across product, front-end, back-end, and infrastructure so complex systems can move from idea to delivery with less handoff friction while reviewing processes for enhanced efficiency. Taking charge of polyvalent missions, with a holistic point of view.

svg learning

Learning
& Innovation

I learn fast, test new approaches, and turn useful discoveries into repeatable workflows that help both delivery speed and quality. I research and propose new and innovative solutions to challenging problems Applied learning with practical leverage.

Career Path

A dated path through roles, certifications, and education.

  1. 2022-Present

    Role

    Senior Full-Stack Blockchain Developer

    OpenZeppelin | Remote

    Full-stack blockchain delivery across Sui tooling, contract operations, React UI, AWS microservices, and CI/CD.

  2. 2022

    Certification

    Professional Scrum with Kanban I

    Scrum.org

    Professional Scrum with Kanban I certification focused on delivery flow and continuous improvement.

  3. 2022

    Certification

    Certified Ethereum Developer I

    Blockchain-Council.org

    Certified Ethereum Developer I credential covering smart contract and blockchain foundations.

  4. 2021

    Role

    Senior Software Developer

    Aldo | Montreal, Canada

    Built event-driven TypeScript services on AWS, maintained CI/CD, and led onboarding plus developer-tooling improvements.

  5. 2021

    Role

    Full Stack Developer and Scrum Master

    Spockee | Montreal, Canada

    Delivered Koa and Express applications, Terraform-managed AWS infrastructure, Docker orchestration, and Scrum facilitation.

  6. 2021

    Certification

    Professional Scrum Master I

    Scrum.org

    Professional Scrum Master I certification for team facilitation and practical delivery management.

  7. 2020

    Role

    Lead Full Stack Developer and Devops

    Tooly | Montreal, Canada

    Owned architecture and technical decisions while shipping the MVP and aligning the product with business needs.

  8. 2020

    Certification

    Product Manager Program I

    Linky Product Bootcamp

    Product program focused on user needs, problem framing, and product decision-making.

  9. 2019

    Role

    Co-founder and CTO

    VizzMD at Centech's Acceleration Program | Montreal, Canada

    Set startup and technology direction, drove market fit work, and built the MVP with Rails and React.

  10. 2019

    Role

    Teacher for the Full Stack Developer Program

    Le Wagon | Montreal, Canada

    Taught programming and helped students build product projects while strengthening mentoring and technical communication.

  11. 2019

    Certification

    Full Stack Developer Program Certification

    Le Wagon Bootcamp

    Completed the full-stack developer program with hands-on product and web engineering training.

  12. 2018

    Role

    Web Analyst and Data Engineer

    LCI Education | Montreal, Canada

    Built reporting pipelines, automated performance metrics, and supported digital acquisition analytics.

  13. 2017

    Education

    Master's Degree in Sociology

    University of Quebec at Montreal (UQAM)

    Master's degree in Sociology, Magna Cum Laude, with research focused on discrimination and social integration models.

Showcased Projects

These projects show recent work across product engineering, systems delivery and developer tooling. Sorted in chronological order.

Case study 01

Sui Marketplace Tooling

Building the tooling layer for a Sui marketplace dApp

Context

At OpenZeppelin, I built a full-stack marketplace example and the surrounding tooling layer to make Move contract development easier across environments.

Build

The work covered contract publishing, deployment artifacts, network-aware configuration, transaction helpers, and an integration test harness that could deploy contracts, seed state, and validate end-to-end flows.

Outcome

The result was a stronger developer experience and a more repeatable pipeline for building, testing, and operating Sui applications with Move smart contracts.

Focus Areas

  • TypeScript
  • Move
  • React
  • Sui
  • Smart Contracts
  • Deployment Tooling

Links

View ecosystemSource
Sui tooling project preview

Case study 02

OpenZeppelin Defender

Securing smart contract operations at scale

Context

I worked on OpenZeppelin Defender, a platform teams use to deploy, monitor, and operate smart contracts in production with stronger operational safety.

Build

My scope spanned full-stack product work, from blockchain integration flows to AWS-backed microservices and the user-facing application layer.

Outcome

I shipped features around contract administration, automation, and monitoring so teams could react to on-chain events faster and reduce manual operational work.

Focus Areas

  • TypeScript
  • Node.js
  • Svelte
  • AWS Lambda
  • DynamoDB
  • SNS

Links

View docs
OpenZeppelin Defender preview

Case study 03

Astro Light

A teaching dApp for DeFi and DAO concepts

Context

I built Astro Light as a hands-on way to teach blockchain fundamentals beyond slide decks and theory.

Build

The project combined a compact DeFi and DAO experience on Ethereum testnet where users could buy a token, swap, stake, and participate in a governance flow that changed the UI through on-chain decisions.

Outcome

It was designed as both a learning sandbox and a compact smart contract demo, turning wallets, contract calls, token flows, and governance into something people could actually use and understand.

Focus Areas

  • Solidity
  • Ethereum
  • Smart Contracts
  • DeFi
  • DAO
  • Governance

Links

Source
Astro Light dApp preview

Role-Fit AI Lab

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