Summary
Overview
Work History
Education
Skills
Websites
Certification
Languages
Timeline
Generic

David Dacruz

Lisbon

Summary

Ruby on Rails Engineer with proven expertise in full-stack development and backend architecture. Proficient in designing scalable APIs and building web applications, with a focus on integrating blockchain technologies like UTXO and PSBT. Experienced in DevOps practices, including containerization, CI/CD pipelines, and cloud deployments. Collaborated effectively in startup environments, delivering production-ready platforms from concept to deployment.

Overview

8
8
years of professional experience
1
1
Certification

Work History

Ruby on Rails | Full Stack Engineer

OrdinalsBot
10.2024 - 09.2025
  • Managed architectural design and execution of Ruby on Rails application, reinforcing coding standards and facilitating in-depth code reviews to sustain exceptional code quality throughout engineering teams.
  • Developed and launched hundreds of features utilizing full-stack technologies (Rails, React/Next, Node.js/TypeScript) within agile frameworks, ensuring timely project completion
  • Implemented extensive test-driven development practices organization-wide, achieving nearly complete test coverage through strategic deployment of RSpec, MiniTest, Faker and Cucumber testing frameworks.
  • Engineered and streamlined CI/CD infrastructure utilizing AWS DevOps tools, significantly enhancing deployment cycles and boosting release reliability
  • Engineered high-performance RESTful and GraphQL APIs to enhance data exchange and integration across distributed systems
  • Directed database architecture initiatives encompassing intricate query optimization, stored procedure creation, and strategic normalization/denormalization patterns in PostgreSQL.
  • Led backend engineering teams in executing advanced performance optimization techniques, including multi-layer caching strategies, load balancing configurations, and sophisticated database indexing.
  • Engineered and optimized AWS cloud infrastructure (EC2, EKS, S3, RDS, CloudWatch) through containerized deployment utilizing Docker and Kubernetes, significantly boosting system resilience and operational monitoring
  • Promoted agile development techniques through bi-weekly production demos, effectively converting user feedback into improved product functionality and decreased defect rates.
  • Initiated and expanded mission-critical web services accommodating extensive user traffic while ensuring exceptional system reliability and performance standards
  • Trained and empowered junior engineering talent through systematic pair programming sessions and in-depth code reviews, bolstering team competencies and encouraging knowledge dissemination

Ruby on Rails | Full Stack Engineer | Co-Founder

Tokentech
Paris
11.2023 - 10.2024
  • Co-founded a Web3-focused startup delivering solutions for smart contracts, DAOs, and blockchain-enabled applications.
  • Engineered Rails backends for tokenized applications utilizing PostgreSQL schemas to support complex business logic.
  • Built APIs for wallet connections and transaction signing with Rust + Rails integration.
  • Administered cloud infrastructure on AWS (EC2, S3, RDS, CloudWatch) and streamlined deployments using GitHub Actions.
  • Facilitated technical workshops and guided startups in early development phases by architecting MVPs and backend systems.
  • Developed responsive web applications using JavaScript, HTML, and CSS frameworks.

Full Stack Developer

My JUNGELY
Lisbon, Lisbon
02.2021 - 09.2023
  • Built educational software tools in Ruby on Rails to streamline student and candidate onboarding processes.
  • Maintained internal platforms and integrated role-based access control into the campus management system.
  • Oversaw daily student management, coordinated volunteers, and delivered technical support for platform operations.
  • Collaborated with designers to create user-friendly interfaces and improve user experience.
  • Maintained version control systems like Git for source code management.

Ruby on Rails | Full Stack Engineer

42 Lisboa
Lisbon, Lisbon
10.2020 - 07.2021
  • Maintained and extended Rails-based platforms for business operations across logistics and media sectors.
  • Designed and optimized APIs for third-party integrations, improving interoperability between systems.
  • Introduced new features in Rails applications utilizing React front-ends while delivering backend support for video upload and streaming services.
  • Handled bug tracking, issue resolution, and system performance improvements through clean, maintainable code.

Full Stack Developer

42
Paris
07.2020 - 10.2020
  • Revamped campus-wide platforms for 42 Network utilizing Rails-based applications.
  • Deployed applications on cloud platforms such as AWS and Heroku.
  • Developed new features, improved code architecture, and maintained continuous system reliability.
  • Delivered technical support to students and administrators, ensuring seamless functionality of mission-critical tools.

Full Stack Developer (Contract Projects)

MyVestiaire
Paris
01.2020 - 07.2020
  • Developed POC utilizing Rails and Node.js for web scraping to generate fashion recommendations based on seasonal color palettes
  • Managed database design and optimization using SQL for efficient data storage.
  • Wrote user manuals and other documentation for roll-out in customer training sessions.
  • Developed requirements for system modifications and new system installations.
  • Assisted in troubleshooting and debugging issues reported by users or clients.

Full Stack Developer

Cabinet Infirmier Marseille Prado
Marseille
04.2017 - 01.2020
  • Developed and deployed a Rails-based website for a healthcare client.
  • Implemented SEO, optimized performance, and delivered a production-ready solution that improved visibility and usability.
  • Engineered and sustained front-end web applications employing HTML, CSS, and ReactJS/Next.js.

Education

Digital Technology Architect -

42 Paris
Paris, FR
01.2020

Programming -

The_Hacking_Project
Paris, France
01.2018

Computer Programming -

Human Booster
Paris, France
01.2017

Skills

    Backend & Architecture

  • Languages & Frameworks: Ruby on Rails, Nodejs, Rust, GraphQL
  • Testing & Quality: RSpec, Minitest, TDD, Faker
  • Message Brokers & Async Processing: Kafka, RabbitMQ
  • API Design: RESTful APIs, GraphQL Schemas

    • Frontend Engineering

  • Frameworks & State Management: nextjs, vuejs, Justand, Redux, Redux-Saga, Jotai
  • Build Architectures: Micro Frontends, Module Federation, Progressive Web Apps (PWA)
  • Styling & UI: Tailwind CSS, Material UI, Bootstrap
  • Client-Side Data: React Hook Form, Axios, Fetch API, IndexedDB, TanStack

    • Cloud & DevOps

  • Cloud Platforms: AWS, Azure, Vercel, Netlify
  • Infrastructure as Code: Terraform, AWS CloudFormation
  • CI/CD & Automation: GitHub Actions, GitLab CI/CD, Jenkins, Azure DevOps
  • Containerization & Orchestration: Docker, Kubernetes, AWS Elastic Beanstalk
  • Serverless & Compute: AWS Lambda, AWS Step Functions
  • Monitoring & Logging: AWS CloudWatch

    • Databases & Data Stores

  • Relational: PostgreSQL, MySQL, MS SQL Server
  • NoSQL & Cloud Native: MongoDB, Amazon DynamoDB, Azure Cosmos DB
  • Caching & Object Storage: Amazon S3

Websites

Certification

Certified Ethical Hacker (CEH)
- Cabinet Infirmier Marseille et Infirmière à Domicile 13008
- Issued Dec 2018

Design Thinker
- dthinking academy
- Issued Dec 2018

HEC x 42 Design Thinking Academy
- HEC Paris
- Issued Jan 2018

Languages

  • French, Native
  • English, Fluent
  • Portuguese, Elementary

Timeline

Ruby on Rails | Full Stack Engineer

OrdinalsBot
10.2024 - 09.2025

Ruby on Rails | Full Stack Engineer | Co-Founder

Tokentech
11.2023 - 10.2024

Full Stack Developer

My JUNGELY
02.2021 - 09.2023

Ruby on Rails | Full Stack Engineer

42 Lisboa
10.2020 - 07.2021

Full Stack Developer

42
07.2020 - 10.2020

Full Stack Developer (Contract Projects)

MyVestiaire
01.2020 - 07.2020

Full Stack Developer

Cabinet Infirmier Marseille Prado
04.2017 - 01.2020

Digital Technology Architect -

42 Paris

Programming -

The_Hacking_Project

Computer Programming -

Human Booster

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