Elena-Cristina Conacel, Developer in Bucharest, Romania
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Elena-Cristina Conacel

Verified Expert  in Engineering

Full-stack Developer

Bucharest, Romania
Toptal Member Since
September 3, 2020

Cristina has over five years of experience in founding startups focused on developer tools that reached over 500,000 users. She is a full-stack developer passionate about Ruby on Rails and responsive-web design. She has experience working in cross-functional teams and seeing a product go from idea to live and succeed.


Get Clear Consulting Ltd
Ruby on Rails (RoR), JavaScript, HTML, CSS, Less, Capistrano, Ansible...
Cowboy SA
Ruby, Ruby on Rails (RoR), HTML, CSS, JavaScript, PostgreSQL, Agile, Front-end...
Z News Service
TypeScript, Next.js, Material Design, APIs, React, Pixel Perfect, Zeplin...




Preferred Environment

Bootstrap, SCSS, React, Ruby on Rails (RoR), Ruby, MacOS

The most amazing...

...thing I've done is co-founding a Bootstrap store with themes and templates that were downloaded and used by hundreds of thousands of developers.

Work Experience

Ruby on Rails Developer

2023 - 2024
Get Clear Consulting Ltd
  • Handled updating the project Docker configuration.
  • Updated Rails from version 4.2 to 5.2 and Ruby from 2.4 to 2.5.
  • Brought Ansible and Capistrano scripts up-to-date and handled the creation of a staging server on DigitalOcean.
  • Implemented new features for customers (e.g., included a new set of icons, new font options from Google Fonts, and advanced settings for fonts used on the site).
  • Monitored and fixed bugs after each deployment and brought improvements to the site's functionalities.
Technologies: Ruby on Rails (RoR), JavaScript, HTML, CSS, Less, Capistrano, Ansible, Phusion Passenger, Amazon S3 (AWS S3), Ruby

Full-stack Engineer

2021 - 2023
Cowboy SA
  • Developed custom features regarding trip analysis (like personal records), available via API to customer mobile apps and internally via the admin dashboard.
  • Created functionalities and maintained an in-house booking platform for on-demand technician appointments.
  • Added custom SLA generators for internal reports of technicians' and test riders' availabilities.
  • Participated in back-end scaling efforts, moving time-consuming processing to background jobs and researching ways to deal with data streams for each trip.
  • Investigated slow queries and improved background DB processes like vacuuming and memory bloat.
Technologies: Ruby, Ruby on Rails (RoR), HTML, CSS, JavaScript, PostgreSQL, Agile, Front-end, Back-end, Database Optimization, Sidekiq, Full-stack, Infrastructure, Redis, New Relic, Heroku, Amazon S3 (AWS S3), Amazon Aurora, JSON, Bootstrap, RSpec, Protobuf, Google Places API, Google Calendar API, Typeform.io, Shopify API, GraphQL, Intercom API, Slack API, Firebase, Mapbox, Airtable

Front-end Developer

2020 - 2021
Z News Service
  • Implemented reusable custom React components for a news-article pipeline submission and management of users and articles.
  • Implemented design specifications received via Zeplin into responsive interface components.
  • Refactored the page structure and component hierarchy for better maintainability and updates.
Technologies: TypeScript, Next.js, Material Design, APIs, React, Pixel Perfect, Zeplin, Kanban, Jira, Refactoring, Single-page Applications (SPA), Material UI, JSS, MacOS

Full-stack Developer

2020 - 2021
Stealth Startup
  • Helped clients transform their ideas into a solid development plan, with steps, estimates, and recommended technologies.
  • Created mockups and user flows for all the features available in the application.
  • Developed a website that connects businesses in order to create shared marketing goals. Features included classic and LinkedIn registration, building of profile, discovering other business with filtering options, live chat, and email notifications.
  • Implemented design based on Photoshop specifications using Bootstrap and making sure of responsiveness.
Technologies: Ruby, Ruby on Rails (RoR), Unit Testing, Functional Testing, User Interface (UI), User Experience (UX), Web Development, Bootstrap, Heroku, Google Maps, Google Places API, Image Manipulation, RSpec, Communication, CSS3, Jest, MacOS, Full-stack, Infrastructure

Full-stack Developer

2018 - 2020
NearFish App
  • Developed a custom Ruby on Rails website and Android application for managing fitness studios.
  • Registered and offered support to five fitness studios that used the application for managing their activity.
  • Developed custom features based on feedback from fitness studios and helped them use them with their clients.
Technologies: Android Development, Functional Testing, Unit Testing, Scrum, Agile, PostgreSQL, jQuery, React, SCSS, HTML5, JavaScript, Bootstrap, Ruby on Rails (RoR), Kanban, MacOS, Full-stack, Infrastructure


2017 - 2020
  • Migrated a custom Bootstrap theme store from a Zend architecture to Ruby on Rails and implemented a new design using Bootstrap.
  • Created multiple open-source and premium Bootstrap and React themes distributed through the platform and downloaded by hundreds of users.
  • Wrote an in-depth tutorial series about the Bootstrap framework that helps developers get started with it, that was read by thousands of users.
  • Developed and maintained business relationships with over 80 theme authors on the BootstrapBay platform and offered support for theme development.
  • Offered support for more than 40,000 users registered on the BootstrapBay platform.
Technologies: Ruby, Ruby on Rails (RoR), React, Redux, Bootstrap, WordPress, Agile, User Experience (UX), User Interface (UI), Heroku, Dashboards, Unit Testing, Single-page Applications (SPA), API Architecture, Architecture, Web Architecture, CSS, CSS3, Jest, MacOS, Full-stack, Infrastructure

Managing Partner

2013 - 2017
Creative Tim
  • Developed a platform for uploading, distributing, and selling Bootstrap themes that reached over 500,000 users.
  • Designed, developed, and maintained multiple Bootstrap themes and templates downloaded by thousands of developers.
  • Offered support for platform users with continuous integration of fixes and improvements for the Bootstrap store.
  • Added new features that increased the number of visitors and website conversions, constantly improving the platform's design, speed, and functionality.
  • Integrated the Paypal and 2Checkout payment API for handling payments and multiple third-party tools for user tracking and targeted marketing campaigns.
  • Developed in-house libraries for email marketing campaigns, product ratings, user support, comments, and notifications systems.
Technologies: Agile, Scrum, Heroku, 2Checkout, JavaScript, SCSS, HTML5, jQuery, Bootstrap, Leadership, Software Architecture, Software Troubleshooting, MySQL, PostgreSQL, Kanban, MacOS, Full-stack, Infrastructure, Ghost, Devise


A Bootstrap store that allows authors to sell and market their themes.

Acquired the platform, completed a migration from Zend to Ruby on Rails, and a redesign using Bootstrap. Managed the client and authors' relationships, offering support and advice for better theme creation.


An Android application that works together with a Ruby on Rails server aimed at fitness studios.

Developed a complete dashboard that offered insightful analytics for instructors and an intuitive application for user management. Supported studios using it, managed client expectations, and added newly requested features.

Creative Tim

A custom store for distribution of in-house built front-end themes and templates.

Developed the platform and multiple themes with my co-founder. Handled back-end development on Ruby on Rails, integration with 3rd party APIs, and design implementation. Managed a team of developers that created and developed multiple themes and constantly added new features to the platform.

Lazy Kit React

A React theme with custom components released open-source.

Built on top of Bootstrap 4 and Reactstrap using React Router and SCSS design sheets. Designed, developed, and offered support for developers using the theme.

Lazy Kit Bootstrap

A custom-built Bootstrap kit released open-source.

Created a consistent design theme featuring multiple color schemes over the Bootstrap 4 components. Integrated 3rd party plugins and created custom skins for them. Offered support on GitHub Issues for developers using it.
2013 - 2015

Master's Degree in Software Engineering

University of Bucharest - Bucharest, Romania

2010 - 2013

Bachelor's Degree in Computer Science

University of Bucharest - Bucharest, Romania


React, REST APIs, React Redux, React Router, PayPal API, jQuery, Google Maps, Google Places API, Sidekiq, Protobuf, Google Calendar API, Typeform.io, Shopify API, Intercom API, Slack API, Devise


Git, 2Checkout, Zeplin, RSpec, Jira, JSS, Ghost, Capistrano, Ansible


Ruby on Rails (RoR), Bootstrap, Redux, Next.js, Jest, Material UI


SCSS, JavaScript, CSS, HTML, Sass, HTML5, SQL, Ruby, C++, TypeScript, CSS3, GraphQL, Less


MySQL, PostgreSQL, JSON, Databases, Redis, Amazon S3 (AWS S3), Amazon Aurora


MacOS, Heroku, WordPress, New Relic, Firebase, Mapbox, Phusion Passenger


Agile Software Development, Agile, Unit Testing, Functional Testing, REST, Refactoring, Web Architecture, Scrum, Kanban, API Architecture, Database Design


Web Development, APIs, Pixel Perfect, Full-stack, Front-end, Back-end, Integration, Axios, User Interface (UI), User Experience (UX), Dashboards, Infrastructure, Android Development, Image Manipulation, Material Design, Communication, Leadership, Software Architecture, Software Troubleshooting, Single-page Applications (SPA), Architecture, Computer Science, Algorithms, Graphs, Mathematics, IT Project Management, Data Structures, Multithreading, Database Optimization, Airtable

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