Senior Full Stack Engineer (AdTech)

Location: Barcelona, Spain; hybrid schedule with work from home 2 days per week and flexible hours. Candidates must have a legal permit to work in Spain; visa sponsorship is not provided.

Company

hirify.global is an AI-powered performance advertising engine for mobile apps and Connected TV, delivering campaign growth through a product used by marketers worldwide.

What you will do

• Architect, develop, and deliver internal creative tooling using Angular and TypeScript.
• Build lightweight client-side components and interactive playable ads optimized for mobile webviews, bundle-size limits, and sandboxed iframes.
• Design and maintain Node.js microservices and pipelines for dynamic asset generation, headless bundling, tracking, and redirects.
• Improve engineering quality through code reviews, technical RFCs, automated testing, and technical-debt reduction.
• Coach mid-level engineers on web fundamentals, design patterns, debugging, and technical decision-making.

Requirements

• 5+ years of professional software engineering experience, with deep expertise in TypeScript across client and server environments.
• Strong knowledge of modern Angular, including Signals, Standalone Components, reactive state management, change detection strategies, and modular code organization.
• Strong Node.js foundations, including asynchronous event loops, streaming I/O, headless compilation and bundling, and REST/microservice API design.
• Strong browser and runtime fundamentals, including DOM/Canvas performance, memory lifecycle management, iframe sandboxing, postMessage protocols, and asset-loading optimization.
• Proven ability to conduct high-signal code reviews, design maintainable systems, and introduce pragmatic automated testing.
• Genuine interest in mentoring engineers and explaining the reasoning behind technical decisions.
• Legal authorization to work in Spain is required; candidates requiring visa sponsorship will not be considered.

Nice to have

• Familiarity with digital advertising, including MRAID specifications, tracking macros, click-through handling, or attribution models.
• Experience with HTML5 Canvas, WebGL, or rendering libraries such as PixiJS, Phaser, or Three.js.
• Experience with esbuild, Vite, Rollup, or custom AST transformation pipelines.
• Experience implementing automated CI/CD performance and bundle-budget monitoring.

Culture & Benefits

• Hybrid work with two work-from-home days per week, flexible hours, and a strong work-life balance.
• Office in central Barcelona with a rooftop terrace, barbecue, and stocked fridge.
• Meal vouchers and a monthly gym allowance with DiR or Wellhub.
• LinkedIn Learning, training opportunities, monthly TGIF events, and regular team-building activities.
• Friendly, dynamic environment with marketers and engineers from more than 40 countries.