Decima builds and evolves complex commerce systems that power global brands.
We’re looking for a Lead Backend Engineer who operates at an architect level but stays deeply hands‑on.
Most of our clients already have large, business‑critical Adobe Commerce (Magento 2) platforms in place. Your role is not to rebuild them from scratch — but to carefully evolve, extend, and improve them without breaking what already works.
This requires a different mindset: understanding existing systems deeply, making safe and well‑reasoned changes, and balancing long‑term architecture with real‑world constraints.
You’ll be the person engineers rely on when changes are risky, and the one clients trust when stability matters as much as progress.
Role Overview

In this role, you will lead the evolution of existing enterprise Adobe Commerce Cloud platforms — introducing new features, integrations, and improvements while preserving system stability
You’ll work within complex, already built ecosystems, making thoughtful architectural decisions that respect existing constraints and minimize risk
This is a hands‑on role — you’ll actively contribute to implementation, review critical code, and ensure that every change is safe, scalable, and aligned with the overall system design

Responsibilities

Own architecture decisions within existing Magento 2 systems — balancing improvement with stability
Analyze and deeply understand legacy codebases and current system behavior before making changes
Design extensions and integrations that fit cleanly into existing architecture
Ensure backward compatibility and minimize regression risk in all changes
Lead complex integrations with ERP, PIM, OMS, CRM systems within existing environments
Review critical code changes with a focus on safety, performance, and maintainability
Identify architectural risks and propose safe, incremental improvements
Guide the team in making thoughtful, non‑breaking changes




Participate in discovery and pre‑sales — assessing existing systems and proposing realistic solutions
Document decisions with clear reasoning and trade‑offs

Requirements
Core Technical Requirements

8+ years of professional software development experience
5+ years of hands‑on Magento 2 / Adobe Commerce Cloud development
Deep understanding of Magento 2 architecture – DI, plugins, service contracts, extension attributes, event/observer patterns
Proven experience designing integrations with ERP, OMS, or PIM systems (SAP, NetSuite, Akeneo, or similar)
Strong PHP engineering skills, OOP, and design patterns
Experience with APIs (REST, GraphQL) and service‑oriented architecture
Experience with cloud environments and DevOps (CI/CD, Docker, AWS/GCP, Magento Cloud)
Prior experience in a lead or architect‑level role with ownership of technical decisions
Strong communication skills – able to explain technical decisions clearly.

Engineering Mindset

Experience working with large, existing Magento 2 codebases (not only greenfield projects)
Strong ability to understand and safely modify legacy systems
Experience delivering improvements without full rewrites
Ability to balance adecuado architecture with real‑world constraints
Strong debugging and root‑cause analysis skills in complex systems
Experience working in environments where system stability is critical. В

We Offer

Work on enterprise commerce systems powering global brands
Real architectural ownership
Supportive, transparent, and collaborative team culture
Ongoing professional development and learning support

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.
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📌 Lead Backend Engineer (Adobe Commerce / Magento) (Madrid)
🏢 Decima Digital
📍 Madrid