Job Description

Do you enjoy solving technical challenges, experimenting with code, and working across the stack? We’re looking for a Full-Stack JavaScript Developer to join our team. You’ll work with JavaScript both in the browser and on the server to build high-performance solutions and tackle unique challenges in ad tech — from bot detection and anti-adblock resilience to high-performance video rendering.

What you will do…

• Build and implement JavaScript code for rendering ad formats on third-party sites.

• Work with Node.js and Puppeteer to deliver, test, and optimize ad solutions.

• Use browser APIs (DOM manipulation, fetch, WebGL, sessionStorage, IndexedDB) to collect and process data.

• Troubleshoot and debug issues across both client and server environments.

• Optimize code and workflows for performance and reliability.

• Collaborate with cross-functional teams to integrate ad solutions seamlessly.

• Contribute to automation and deployment using tools like Docker, Kubernetes, and bash scripting.

• Work on advanced detection and prevention techniques to distinguish real users from bots.

• Maintain and optimize high-performance ad rendering solutions, including video formats (VAST).

• Develop tools to ensure ads display reliably, even in challenging environments.

• Stay current with modern web technologies and bring fresh ideas to the team.

Our Tech Stack...

• Frontend: Vanilla JS, React, Webpack, Rollup

• Backend: Node.js, Express, Puppeteer, Playwright, Redis, MariaDB

• DevOps & Infra: Docker, Kubernetes, Cloudflare Page Functions, Jenkins, bash scripting

• Versioning & Workflow: Git

We'd love to meet someone with...

• 2+ years of professional JavaScript development experience.

• Bachelor’s degree in Computer Science (or equivalent hands-on experience).

• Deep understanding of web technologies, including DOM manipulation and modern web APIs.

• Experience with both browser-side and server-side JavaScript.

• Strong attention to detail, ensuring precision when working with product requirements and technical implementations.

• Confident working in a Linux environment and using the terminal as part of daily development.

• Ability to pick up new tools and technologies quickly.

• Comfortable working without reliance on frameworks when needed.

• Fluent in English.

What would be a bonus...

• Experience with performance profiling and debugging tools.

• Familiarity with other programming languages (TypeScript, PHP).

• Exposure to CI/CD workflows.

The life of an Adcasher includes…

• Working on challenging, performance-focused problems across browser and server environments.

• Collaborating with a highly technical team on a modern, diverse stack.

• Opportunities for growth in frontend, backend, and DevOps.

• Flexible work options – on-site or remote.

• Comprehensive health insurance coverage.

• MultiSport membership to support your well-being.

• Dedicated learning budget for courses, conferences, or books.

• Additional vacation days based on years of service.

• Shuttle program with opportunities to work from our other offices.

• Vibrant co-working space in the heart of Sofia.

• Team events and activities to connect and have fun together.

A little bit about Adcash

Adcash is a global online advertising platform. Our team has been rocking the ad tech industry since 2007 and we’ve offices in Tallinn, Barcelona, and Sofia.
We have 10K+ active campaigns worldwide in 195 countries that reach 200M+ unique internet users every day. There's a high probability you've seen our ads when browsing the web.

Teams apply Scaled Agile Framework methodologies to handle our challenges. We keep in mind transparency, scaling, automation, simplicity and data-driven decisions to make our work impactful. We are customer-centric and we aim to deliver profitable solutions.

Want to see our culture in action? Take a look at our Instagram account and discover what being an Adcasher is all about. #WildAboutAdcash

To take the next step in your career with us, please send your CV in English.