ph3About US /h3 pAt Leadtech, we’ve been redefining digital businesses since 2009, creating innovative online solutions that reach millions of users every month. With a diverse team of over 700 members from 23+ nationalities, we’re united by a passion for creativity and collaboration. /p h3About US /h3 pAt Leadtech, we’ve been redefining digital businesses since 2009, creating innovative online solutions that reach millions of users every month. With a diverse team of over 700 members from 23+ nationalities, we’re united by a passion for creativity and collaboration. /p pWe specialize in delivering user‑centric experiences across web and mobile platforms, where people can connect with our products like never before. /p pWe’re proud of our general reach and committed to fostering an inclusive workplace where every individual contributes to our shared vision of bringing cutting‑edge projects to life. Learn more about our journey and mission on our page! /p h3About The Role /h3 pWe’re looking for a MarTech Full‑Stack Developer to join our Marketing Technology AdTech team. /p pThis is not the kind of “full‑stack” role where you’ll spend your life centering buttons or debating border‑radius values for three sprints. You’ll be working at the intersection of engineering, attribution, internal tooling, and growth — building the systems that make campaign measurement reliable, data flows usable, and marketing teams less dependent on guesswork. /p pYou’ll help us maintain and evolve the technical backbone behind tracking, postbacks, schemas, integrations, and internal tools. That includes working on our internal CRM/tooling, improving how marketing teams operate, and making sure data moves where it should, when it should, and in the format it should.



/p pYou’ll collaborate closely with performance marketers, product owners, developers, and data stakeholders, acting as a bridge between business needs and technical implementation. /p pAnd just so we’re clear: we don’t really care what you studied or where. Computer Science, Physics, Philosophy, self‑taught, bootcamp, or “learned by breaking production and fixing it later” — all valid. /p pWe care about what you can do, how you think, and how you take ownership. /p pAlso: if you use AI to move faster, think better, document clearer, or automate boring work — great. That’s a plus. /p h3What You’ll Be Doing /h3 h3Attribution Tracking Infrastructure /h3 ul liBuild and maintain attribution and tracking systems across web and app environments. /li liWork with tools like GA4, Appsflyer, Adjust, and server‑side/custom setups. /li liHandle event deduplication, postback routing, conversion events, and parameter consistency. /li liDefine, maintain, and enforce tracking schemas across projects. /li liEnsure tracking is not just implemented, but actually reliable and usable. /li /ul h3Internal Tooling CRM /h3 ul liDevelop and extend features within our internal CRM and marketing tooling. /li liBuild internal UIs and workflows that help marketing teams operate more autonomously. /li liImprove existing tools instead of rebuilding everything from scratch. /li liWork on real,



messy operational problems — not just clean abstractions. /li /ul h3Data Flow Warehousing /h3 ul liPipeline campaign and attribution data into warehouses such as BigQuery. /li liEnsure data quality, consistency, and availability for analysis. /li liAlign platform data, internal systems, and warehouse outputs (ideally without creating multiple conflicting truths). /li liCollaborate with Data and Product on schema design and governance. /li /ul h3Network Signaling Integrations /h3 ul liBuild and manage server‑to‑server integrations with ad networks. /li liDevelop APIs and middleware for event ingestion and delivery. /li liWork with platforms like Meta, Google Ads, TikTok, Snapchat, etc. /li liSupport integrations related to monetization and subscriptions (e.g. RevenueCat). /li /ul h3Monitoring, QA Debugging /h3 ul liAutomate testing and monitoring of attribution and tracking flows. /li liInvestigate discrepancies between internal data, warehouses, and ad platforms. /li liCatch issues before they become “performance dropped… or maybe tracking broke.” /li liBring visibility and structure to systems that are usually invisible until they fail. /li /ul h3Cross‑functional Collaboration /h3 ul liAct as a bridge between Marketing, Product, and Engineering. /li liWork with POs, developers, and marketers to define tracking and data structures. /li liTranslate business needs into technical implementations (and push back when needed). /li liMaintain and evolve schemas across teams and projects. /li /ul h3Requirements /h3 h3Must‑have /h3 ul liStrong backend experience with Node.js, Typescript and Python. /li liExperience with APIs, REST, webhooks, and server‑to‑server integrations. /li /ul /p #J-18808-Ljbffr

📌 MarTech Full Stack Developer (Barcelona)
🏢 Leadtech Group
📍 Barcelona