Hybrid Senior Software Developer

at Lengow

• Job title: Senior Software Developer
• Job type: Full Time
• Experience level: Senior
• Salary: Not specified
• Degree requirement: Bachelor's Degree
• Tech skills: Cloud, Distributed Systems, Docker, Google Cloud Platform, JavaScript, Kubernetes, MariaDB, PHP, Postgres, Python, React, Symfony, TypeScript
• Location requirements: Hybrid, Barcelona, Spain

About the role

• Full-stack engineer joining Lengow's Tech team in Barcelona to enhance e-commerce solutions. Collaborating cross-functionally while managing backend and frontend development tasks.

Responsibilities

• Design, build, and maintain backend services and APIs in PHP/Symfony across both platforms
• Own database schema design, query optimization, and migration strategies in PostgreSQL/MariaDB
• Contribute to React-based frontends — reviewing, implementing, and improving UI features
• Collaborate on architectural decisions and participate actively in code reviews
• Operate and deploy services in a Kubernetes/GCP environment, maintaining observability with Datadog
• Work closely with product managers, designers, and peer engineers in an agile setup
• Leverage AI-assisted development tools (GitHub Copilot, Claude, Gemini) as part of your daily workflow

Requirements

• You have a good level of English
• Flexible and customer-oriented, you enjoy problem-solving and decision-making based on data and impact measurement.
• Experience with observability tooling (logging, metrics, tracing)
• Backend
• 3–5 years of professional experience with PHP ( preferred Symfony framework but not required )
• Solid understanding of relational databases, with hands-on experience in PostgreSQL (query optimization, schema design, migrations)
• Strong grasp of RESTful API design and integration patterns
• Familiarity with containerization using Docker and Kubernetes
• Frontend
• Working proficiency in React, enough to read, contribute to, and review frontend code confidently
• Comfortable working with TypeScript and modern JavaScript build pipelines.
• Engineering Fundamentals
• Clean code practices, code review culture, and attention to maintainability
• Experience working in remote/hybrid distributed teams
• Comfortable working on large, existing codebases
• AI Literacy & Usage
• Comfortable using AI coding assistants (GitHub Copilot, Claude Code, Gemini) as part of your daily development workflow
• Able to evaluate and apply AI-generated suggestions critically, knowing when to accept, modify, or discard them
• Familiarity with prompt engineering basics and how LLMs can be leveraged for code review, documentation, and test generation
• Curiosity and openness toward emerging AI tooling in the developer ecosystem, including agents and MCP integrations
• Nice to Have
• Ability to own a feature end-to-end (backend + frontend) when needed, reducing cross-team dependencies
• Experience with Python (scripting, data processing, or service development)
• Knowledge of distributed systems concepts (message queues, event-driven architecture, eventual consistency)
• Exposure to GCP or other cloud platforms

Benefits

• Ticket restaurant 8 euros by day
• Malakoff Humanis Private insurance & Prevoyance.
• 3 Remote days per week
• Flexible hours
• Bike mileage allowances or 50% of transportation tickets.
• Remote allowances
• Weekly Happy Break on Thursday Evening at the office with food and beverage
• **Specific benefits may vary depending on your country of employment (France or Spain).**