MarTech Backend Developer, Leadtech

Salary not provided

SQL

React

AWS

CSS

GCP

Python

Node.js

Hubspot

Vue.js

Redshift

Segment

Next.js

Snowflake

BigQuery

Appsflyer

Adjust

Google AdWords

Branch

Git

REST API

Mid and Senior level

Barcelona

Remote from Spain

Online Project Development

Be an early applicant

Online Project Development

501-1000 employees

B2CRecruitmentMarketingSaaSProduct ManagementeCommerce

Be an early applicant

Salary not provided

SQL

React

AWS

CSS

GCP

Python

Node.js

Hubspot

Vue.js

Redshift

Segment

Next.js

Snowflake

BigQuery

Appsflyer

Adjust

Google AdWords

Branch

Git

REST API

Mid and Senior level

Barcelona

Remote from Spain

501-1000 employees

B2CRecruitmentMarketingSaaSProduct ManagementeCommerce

Company mission

To bring forward new business ideas and empower employees to achieve their goals in the online business world.

Job

Company

Role

Who you are

Strong backend experience with Node.js, Python, or Go
Proven experience with REST APIs, webhooks, and API integrations
Experience with serverless environments (AWS Lambda, Cloud Functions, etc.)
Solid knowledge of SQL/NoSQL databases
Experience with Git, CI/CD pipelines
Knowledge of attribution/tracking mechanisms (pixels, UTMs, ID-based matching)
Ability to build/maintain data pipelines (API/CSV → database)
Clear communicator: able to work directly with non-technical stakeholders (marketing teams)
Proactive problem-solver with ownership of data accuracy
Structured, fast, and reliable in solving issues under time pressure

Desirable

Experience with Appsflyer, Adjust, Branch (MMPs)
Familiarity with ad platform APIs (Meta, Google Ads, TikTok, etc.)
Experience with frontend frameworks (React, Next.js, Vue.js) or CSS libraries (Tailwind, SCSS)
Knowledge of marketing automation/CDPs (Segment, HubSpot, RudderStack)
Awareness of privacy regulations (GDPR/CCPA)

What the job involves

We are looking for a MarTech Backend Developer to strengthen our Marketing Technology & AdTech team.
This role is focused on backend engineering with a direct impact on campaign attribution, tracking, data flows, and integrations with advertising platforms
You will collaborate with performance marketers, analysts, and product teams to ensure accurate campaign measurement, reliable data pipelines, and scalable technical infrastructure
Although this is primarily a backend role, you will occasionally work with frontend tasks (tracking scripts, basic landing page support, A/B test setup)
You'll design and maintain server-to-server integrations with ad networks (Meta, Google Ads, TikTok, Snapchat)
Build APIs and middleware for event ingestion and delivery
Develop and maintain data pipelines (API/CSV → SQL/NoSQL databases → warehouses like BigQuery, Redshift, Snowflake)
Implement serverless functions (AWS Lambda, Google Cloud Functions, or equivalent)
Ensure monitoring, QA, and debugging of discrepancies between internal data and ad platforms
Work with Git, CI/CD, and cloud infrastructure (AWS / GCP / Vercel / Netlify)
Implement attribution models (GA4, Appsflyer, Adjust, or custom server-side)
Manage event deduplication, postbacks, and tracking flows
Integrate and troubleshoot tracking scripts (Meta Pixel, GTM, TikTok Pixel)
Support and maintain basic landing pages (responsive layout, UTMs, CRO testing)
Add and debug tracking/analytics scripts
Flextime (7 – 9:30 a.m. / 3:30 – 7:30 p.m)

Our take

Designing and adopting digital services can be inaccessibly expensive and complex for many businesses. Leadtech solves this problem by providing companies with innovative digital solutions.

Leadtech is well served by the diversity of its solutions, which has enabled it to build an impressive customer base. Its suite of tools covers everything from UX design to SEO, content to backend. This ensures that Leadtech has broad appeal to businesses looking for all-in-one digital solutions.

Leadtech has expanded considerably in recent years, now boasting an international team of over 250 people. Growing its talent will be an essential element of the company's continued success in the coming years, as will its commitment to innovation.

Steph

Company Specialist at Welcome to the Jungle

Company

Company benefits

Flexible timetable
Barceloneta district, close to the beach
Happy Fridays and team events
Tickets Restaurant
Fresh fruit and coffee
Game room and terrace

Company HQ

La Barceloneta, Barcelona, Spain

Leadership

Germán Castillo

(CEO)

Previously founded Grupo Germinet and advertising platform Solimba Aplicaciones.

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