Brainly is hiring a

Senior Software Engineer (Front-End), Ad Solutions

Barcelona, Spain




Software Engineer, Ad Solutions will be a part of the cross-functional team dedicated to address the product and reporting needs in the area of ad solutions.
The team will be responsible for launching new product ads, continuously improving our programmatic stack as well as producing tools generating insight to meet the growing needs of our clients. 


What will you do:

  • Researching and integrating new tech and solutions (video players, ad providers etc.)
  • Designing, developing, and maintaining code for Brainly platform to enhance the great learning experience for our users, specifically related to ads stack
  • Creating ads stack application architecture
  • Building and improving our video and display ads stack solution
  • Building ads monitoring system
  • Solving complex challenges such as performance, scalability, and security
  • Collaborating with other software engineers to design scalable services, plan feature roll-out, and ensure high reliability and performance of your deliverables
  • Conducting code reviews, contributing high-quality documentation and building robust test suites for your features


We expect you to have:

  • Excellent knowledge of modern JavaScript (ESNext)
  • Experience with building ads solutions, including knowledge of Google Publisher Tag / Amazon TAM / similar solution or experience in the ads field
  • Knowledge of video stack ecosystem on the web
  • Knowledge of React and its ecosystem
  • Experience in testing with JavaScript frameworks
  • Experience in Responsive Web Design
  • Great knowledge of modern CSS methodology (i.e. BEM)
  • Experience in CSS Flexbox Layout
  • Knowledge of best practices in Website, JavasScript and Mobile performance and optimization topic
  • Fluency in English
  • And at least one of the following:
    • Knowledge of Prebid.js
    • Knowledge of Iframes
    • Ability to optimize the application performance - managing code-splitting, asset delivery, optimizing rendering times etc.
  • Nice to have:
    • Experience with GraphQL
    • Experience in CSS Grid Layout
    • Experience in mobile-first approach in Responsive Web Design
    • Experience in End-to-End testing
    • Production experience in Service Workers


Our stack, that you’ll be working with:

  • Multi-package, multi-repository project, using NPM repo + yarn workspaces
  • Main tech stack: Vanilla JS, React, Redux, Apollo GraphQL
  • Sass (SCSS), CSS Modules
  • Building with Webpack and Babel
  • Type-checking with Flow, linting with Prettier, ESlint, Sass Lint
  • Testing with Jest (enzyme for React) and Cypress
  • Server-side in PHP (Symfony)
  • A/B testing
  • Continuous delivery


Additional details:

  • Location: Kraków/Barcelona or remotely from Poland/Spain
  • Salary: 15 000 - 23 000 PLN gross/ monthly, employment contract
  • Some of our benefits (varies slightly depending on the location): 
    • Flexible working hours and the possibility to work remotely
    • Personal development budget 800$ per year +  unlimited time off policy for participation in conferences and workshops and access to an online learning platform with courses from Udemy, Harvard Manage Mentor and many others
    • Fully paid private health care packages for you and your family (dental care included) provided by Luxmed
    • Fully paid life insurance provided by Warta
    • Multisport Plus card
    • Access to the Mental health Helpline - providing virtual support of external psychologists, psychotherapists, and coaches
    • AskHenry services - personal concierge services to help you to settle your everyday matters (like Ikea shopping or shoemaker visit)
    • Possibility to join one of our Employee Resource Groups and initiatives (Inclusion Council, Ladies at Brainly, Brainly Cares)
    • If needed, additional budget for work remote work accessories


What is BRAINLY?

Brainly is the world's largest peer-to-peer learning community for students, parents and teachers. At, and its group of websites around the world, students connect to both receive and offer help with homework problems and questions. The unique opportunity for students to freely ask questions and gain the confidence that comes from helping others and inspires students to learn in a collaborative community that receives more than 350 million users each month.

Based in Kraków, Poland, with its US headquarters in New York City, Brainly is currently available in 35 countries. The total funding from current investors, including Naspers, General Catalyst Partners, Point Nine Capital, Runa Capital and Learn Capital equals $150M. More information about Brainly is available on

By sending us your application, you agree that Brainly sp. z o.o. with its seats in Krakow, will process your data contained in the form below and in the documents you attach in to participate in recruitment. In connection with this, you have the right to withdraw your consents, the right to access to your data, the right to obtain their copy, rectify them, erase, limit their usage and also data portability right and object to their use by Brainly, as well as to lodge a complaint with the President of the UODO. If you have any questions regarding the use of information about you and exercising your rights related to this use, please contact our DPO - [email protected] If you want get to know more about how Brainly uses and process your personal data [click here].

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