Emanuel Comsa - Professional Experience
Senior Software Engineer
ABOSS - Organisation for artists made easy · Part-time
Dec 2022 - Present · 2 yrs 5 mos
Amsterdam, North Holland, Netherlands · Remote
- Proficiently maintained and enhanced existing Ruby on Rails applications
- Successfully improved the performance of APIs to optimize functionality and user experience
- Collaborated closely with product owners to conceptualize and develop innovative features aligned with business goals
- Committed to leveraging technology to drive efficiency and enhance user satisfaction
Ruby
Ruby on Rails
Cloud Storage
Heroku
Postgres
AppSignal
Node.js
Senior Software Consultant
I Play'd It · Self-employed
Jan 2018 - Present · 7 yrs 4 mos
Zandvoort, North Holland, Netherlands
Back-end
- Designed, developed and implemented content management system using Ruby on Rails which handles imports of product feeds with 10+ million rows of data from retailers and affiliate networks, scraping of partner websites for product information and compiles them to generate product comparisons
- Designed and implemented Postgres database architecture to handle 100+ million rows of data and optimised SQL and Ruby on Rails code to allow daily updates to all rows
- Optimised load times and decreased page load time to under 500 ms by distributing application to multiple servers
Front-end
- Implemented admin panel for content management system using Ruby on Rails, creating user-friendly interface for partners to add and manage product feeds
- Developed 10+ dynamic websites with server side rendering using React and NextJS which consume an Ruby on Rails API to display content from the content management system
- Developed 2 websites using microservices, Ruby on Rails APIs and ReactJS which handle 200,000+ visitors per day
Web Development
Next.js
React.js
Datadog
Ruby on Rails
JavaScript
HTML 5
MySQL
Postgres
OOP
RSpec
Ruby
Devise
Technical Lead
Sparqle · Part-time
Jan 2023 - Apr 2024 · 1 yr 4 mos
Amsterdam, North Holland, Netherlands · Remote
- Integral role in developing a SaaS platform from inception, working alongside founders to shape its vision
- Expertly integrated e-commerce functionalities, ensuring seamless transactions and user experiences
- Developed efficient microservices in Ruby to enhance scalability and performance
- Contributed to feature-rich Nest.js backend applications, ensuring robust functionality and stability
- Instrumental in crafting features for React frontend applications, elevating user engagement and satisfaction
NestJS
React.js
Ruby on Rails
AWS Lambda
Postgres
API Development
Technology Leadership
Software Development Consultant and Site Reliability Engineer
Deliveroo · Contract
Sep 2021 - Dec 2022 · 1 yr 4 mos
London, England, United Kingdom
- Optimised 30+ end-points in core application by analysing and troubleshooting existing queries and improving code performance and quality
- Developed infrastructure to reduce database load by 5% by deprecating features using Postgres and re-creating functionality using DynamoDB
- Realised USD 50,000 per month in savings by optimising core services and infrastructure using Ruby on Rails
- Created new microservices by extracting 200,000+ lines of code from a monolith
- Built additional features for existing microservice using ReactJS and NextJS and deprecating corresponding monolith features
- Optimised service and AWS EC2 infrastructure usage by implementing Terraform policies, resulting in 10% improvement in resource usage
- Increased incident response time by setting-up logs, alerts, monitors and debugging issues using Datadog platform and Sentry
Web Development
Next.js
React.js
Datadog
Amazon Dynamodb
Ruby on Rails
Sidekiq
JavaScript
Amazon S3
Terraform
Postgres
OOP
Sentry
RSpec
Ruby
Devise
Senior Software Engineer
ABOSS - Artist Back Office System · Full-time
Apr 2018 - Sep 2021 · 3 yrs 6 mos
Amsterdam Area, Netherlands
- Inherited legacy application with 4+ milion lines of code with no documentation and no code coverage (tests) and aligned it with modern Ruby on Rails coding standards, including by writing 2,600+ Rspec tests
- Reduced application load time by over 60% on 100+ endpoints by identifying and deprecating bad queries and re-implementing necessary code using industry best practices
- Decreased memory usage from over 20GB to a steady 4GB while actual application usage doubled by a wholesale review and rewriting of sub-par code
- Implemented payment system using Stripe
- Created API as an end-point consumed by mobile app in Ruby on Rails which can handle bursts of 2,000+ requests per second
- Developed 200+ new features using Ruby on Rails, including user authentication features using Devise, background job queueing and scheduling using Sidekiq, developed microservice to handle partner requests, among others
- Optimised user interface and user dashboards using JavaScript and ReactJS
Web Development
React.js
Datadog
Ruby on Rails
Sidekiq
JavaScript
Amazon S3
Stripe
Postgres
OOP
Sentry
Interviewing Skills
Heroku
RSpec
Ruby
Devise
AppSignal
Senior Ruby on Rails developer
Shop2market · Full-time
Oct 2015 - Apr 2018 · 2 yrs 7 mos
Hilversum, Netherlands
Back-end
- Implemented 20+ new features and fixed bugs on multiple apps that handle online sales tracking, including a Ruby on Rails 2 monolith and a Ruby on Rails 5 front-end focused application
- Created new Golang service to process and merge multiple file streams on demand, including databases and flat files, creating a system capable of handling streaming of large datasets up to 1GB and over 400,000 product jsons
- Managed and integrated 5 Golang services to run background jobs that read and processed large datasets comprised of tens of millions of records per day and subsequently generated multiple feeds in different formats based on user-defined rules
Front-end
- Implemented a UI capable of loading, reading and displaying the streamed datasets in the browser and allowed users to batch modify product listings
Web Development
React.js
Ruby on Rails
Sidekiq
JavaScript
Amazon S3
Terraform
Go
Postgres
OOP
RSpec
Ruby
Devise
Ruby on Rails Software Engineer
Softvision · Full-time
Nov 2014 - Sep 2015 · 11 mos
Timisoara
- Led a team of 5 back-end and front-end software developers specialising in Ruby on Rails and JavaScript to develop a bespoke app which allowed users to create college funds for loved ones. Designed software architecture, planned infrastructure and handled all steps of development process of a fully-rounded user-facing app, including user authentication and access rights management, payment processing and user interface
- Developed product features and fixed bugs on bespoke medical application for US based client in an environment characterised by high-levels of encryption, adhering to patient data protection standards (HIPAA)
- Mentored student trainees and oversaw their development as part of internship program
Web Development
Ruby on Rails
Sidekiq
HTML
JavaScript
Amazon S3
Postgres
OOP
Interviewing Skills
Heroku
RSpec
Ruby
Devise