Full Stack Developer - MarTech / AdTech - 1014895453

We’re looking for a highly skilled Full Stack Developer to join our MarTech / AdTech team, driving the technical implementation of our marketing attribution pipelines, landing page experiences, and network signaling integrations. This role sits at the intersection of marketing and engineering, enabling accurate measurement, campaign optimization, and seamless user journey tracking across multiple paid channels.

You will work closely with performance marketers, data scientists, and product managers to build scalable tools and solutions that power data-driven growth.

Key Responsibilities:

• Attribution System Development
  
  
• Implement and maintain attribution models using tools like Appsflyer, Adjust, GA4, or custom server-side setups.
  
  
• Develop back-end systems for web-to-app attribution, postback routing, and conversion event handling.
  
  
• Landing Page Infrastructure
  
  
• Build and maintain high-performance landing pages optimized for performance, support CRO A/B testing, and analytics tracking.
  
  
• Integrate dynamic content, UTMs, and tracking pixels for multiple campaigns and traffic sources.
  
  
• Ensure fast load speeds, responsive design, and A/B testing compatibility.
  
  
• Network Signaling & API Integration
  
  
• Set up server-to-server postbacks for networks like Meta, Google Ads, TikTok, Snapchat, etc.
  
  
• Collaborate with marketing platforms to ensure accurate data flows and real-time event signaling.
  
  
• Build APIs and middleware for event ingestion and delivery to third-party networks.
  
  
• Data Flow Management
  
  
• Work with data teams to structure and pipeline campaign data into warehouses like BigQuery, Snowflake, or Redshift.
  
  
• Ensure event deduplication, data integrity, and alignment with marketing KPIs.
  
  
• Monitoring & QA
  
  
• Establish automated testing, monitoring, and alerting for attribution and landing page performance.
  
  
• Debug mismatches between internal systems and ad platforms.

Requirements

Technical Skills:

• Frontend:
  
  
• Strong knowledge of React, Next.js, or Vue.js
  
  
• HTML5, CSS3, Tailwind/SCSS, and client-side performance optimization
  
  
• Integration of tracking scripts (Meta Pixel, Google Tag Manager, TikTok Pixel, etc.)
  
  
• Backend:
  
  
• Node.js, Python, or Go for building APIs and middleware
  
  
• REST & Webhook-based architecture; experience with server-side tracking
  
  
• Familiarity with serverless functions (AWS Lambda, Cloud Functions)
  
  
• Database & DevOps:
  
  
• Experience with SQL/NoSQL (PostgreSQL, MongoDB)
  
  
• Git, CI/CD pipelines, Docker
  
  
• Cloud services: AWS / GCP / Vercel / Netlify
  
  

Attribution & AdTech Experience:

• Deep understanding of mobile/web attribution (SKAN, MMPs, cookie-based, UTM-based)
  
  
• Prior experience with Appsflyer, Adjust, or Branch
  
  
• Familiarity with ad platform APIs (Meta, Google Ads, TikTok, etc.)
  
  
• Understanding of postback systems, event mapping, and event prioritization
  
  

Soft Skills:

• Ability to translate marketing goals into scalable technical solutions
  
  
• Strong communication and cross-functional collaboration skills
  
  
• Problem-solver mindset with a bias for action and testing
  
  
• Proactive ownership over QA and reliability of data pipelines
  
  

Nice to Have:

• Experience with Marketing Automation tools (HubSpot, Braze, Klaviyo)
  
  
• Understanding of privacy regulations (GDPR, CCPA) and tracking implications
  
  
• Experience with CDPs like Segment, RudderStack, or mParticle
  
  

Familiarity with feature flagging and personalization frameworks

Benefits

What We Offer:

• Competitive salary and stock options
  
  
• Remote-friendly environment with flexible working hours
  
  
• Access to top-tier ad budgets, tools, and learning resources
  
  
• A high-impact role at the heart of marketing, product, and engineering

Why should you join us?

Growth and career development

• At Leadtech, we prioritize your growth. Enjoy a flexible career path with personalized internal training and an annual budget for external learning opportunities.

Work-Life balance

• Benefit from a flexible schedule with flextime (7 - 9:30 a.m. start, 3:30 - 6 p.m. end) and the option of working full remote or from our Barcelona office. Enjoy free Friday afternoons with a 7-hour workday, plus a 35-hour workweek in July and August so you can savor summer!

Comprehensive benefits

• Competitive salary, full-time permanent contract, and top-tier private health insurance (including dental and psychological services).
• 25 days of vacation plus your birthday off, with flexible vacation options—no blackout days!

Unique Perks

• If you wish to come, in our office in Barcelona you’ll find it coplete with free coffee, fresh fruit, snacks, a game room, and a rooftop terrace with stunning Mediterranean views.
• Additional benefits include ticket restaurant and nursery vouchers, paid directly from your gross salary.

Join us in an environment where you’re free to innovate, learn, and grow alongside passionate professionals. At Leadtech, you’ll tackle exciting challenges and be part of a vibrant team dedicated to delivering exceptional user experiences

Sounds good? Apply now! We're looking forward to getting to know you.

Equal Employment Opportunity Employer:

Leadtech is an Equal Employment Opportunity (EEO) Employer, which means we encourage applications from people with different backgrounds, interests, and personal circumstances. Our team welcomes applicants regardless of their race, gender, age, religion, nationality, sexual orientation, and/or disabilities. All we need is your high energy, skills, and willingness to be a part of a great project!

Location

You'll have the flexibility to choose whether you'd like to come to the office every day, from time to time, or work fully remote. We want you to find the best combination for you.

If you prefer to be surrounded with amazing people, our exceptional office is in Barcelona’s Blue Building, located right on the city's seafront. Besides our stunning views, you’ll enjoy our office perks such as free fruit, snacks, and coffee and you’ll also be able to take part in our Mario Kart and table tennis competitions.

The personal data you provide will be processed in order to manage your candidacy for the corporate selection processes that fit your profile. If you wish, you can exercise your rights of access, rectification or cancellation by writing to our address (Avenida Litoral, 12-14, 5ta planta. Barcelona. 08005) or to the email address [email protected], attaching to your request a document that can validate your identity.