MarTech Full-Stack Developer

We are seeking a MarTech Full-Stack Developer to join our Marketing Technology & AdTech team. This role is at the intersection of engineering and performance marketing: you will build the technical foundation for campaign attribution, tracking, data flows, and landing page optimization. Your work will directly empower growth teams with accurate data, reliable automations, and scalable infrastructure for multi-channel advertising. You'll collaborate closely with performance marketers, data scientists, and product managers to design, implement, and maintain systems that ensure seamless measurement and optimization of campaigns. Key Responsibilities

• Attribution Systems

• Implement and maintain attribution models (GA4, Appsflyer, Adjust, or custom server-side)
• Support event deduplication, postback routing, and conversion event handling

• Network Signaling & API Integrations

• Build and manage server-to-server integrations with ad networks (Meta, Google Ads, TikTok, Snapchat)
• Develop APIs and middleware for event ingestion and delivery

• Data Flow & Warehousing

• Pipeline campaign and attribution data into warehouses (BigQuery, Redshift, Snowflake)
• Ensure data quality, consistency, and availability for analysis

• Monitoring & QA

• Automate testing and monitoring of attribution and tracking flows
• Debug discrepancies between internal data and ad platforms

• Landing Page Infrastructure (Nice-to-have)

• Build and optimize landing pages (responsive design, CRO, A/B testing)
• Integrate dynamic tracking, UTMs, and analytics scripts

Requirements

• Experience integrating APIs and working with REST/webhooks
• Knowledge of attribution or tracking mechanisms (pixels, UTMs, ID-based matching)
• Experience building or maintaining data pipelines (API/CSV → database)
• Strong backend skills in Node.js, Python, or Go for APIs/middleware
• Experience with serverless functions (AWS Lambda, Cloud Functions, or equivalent)
• Ability to query and work with databases (SQL/NoSQL)
• Experience with Git, CI/CD, and at least one cloud provider (AWS / GCP / Vercel / Netlify)
• Experience with automated monitoring/debugging of data flows

Nice-to Have

• Frontend experience with React, Next.js, or Vue.js
• Strong skills in HTML5, CSS3, Tailwind/SCSS, and web performance optimization
• Direct hands-on experience with MMPs (Appsflyer, Adjust, Branch)
• Familiarity with ad platform APIs (Meta, Google Ads, TikTok, etc.)
• Knowledge of marketing automation (HubSpot, Braze, Klaviyo), CDPs (Segment, RudderStack, mParticle), and privacy regulations (GDPR/CCPA)

Soft Skills

• Ability to translate marketing requirements into technical solutions
• Strong communication and collaboration skills with non-technical stakeholders
• Proactive problem-solver with ownership over data accuracy and reliability

BenefitsYour teamWe're team-first. If you believe in the power of collaboration and that the team's success is your success, then you're one of us! Fun is fundamental. We believe in forming strong bonds in and outside the office. That's why we have a team-building budget and organize activities to enjoy ourselves. Positivity wins the day. Bring a positive attitude and communicate openly. Self-awareness and an openness to learn are always a plus. Perks of being one of us

• Full-time, permanent contract
• Flexible time off, no blackout dates, plus your birthday, Christmas' Eve and New Year's Eve off
• Remote work
• Flextime (7 - 9:30 a.m. / 3:30 - 7:30 p.m)
• Free Friday afternoons (a 7-hour workday!) + 35-hour week in July and August (free afternoons here we come!)
• Enhanced career path designed just for you
• External training budget
• We celebrate all company landmarks

Sounds good? Apply now! We're looking forward to getting to know you. 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. We are an Equal Opportunity Employer and are committed to providing employees with a work environment free of discrimination and harassment. The personal data you provide will be used solely to manage your candidacy for the purposes of this position. You can exercise your rights of access, rectification, or cancellation by sending a letter to Avenida Litoral, 12-14, 5ta planta, Barcelona 08005. Additionally, you can email us at protecciondedatos@LeadTech.com, including documentation proving your identity.