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Lengow

Senior Software Engineer

Lengow

. Join the Market Intelligence team alongside Senior Software Engineers and Software Engineers.

Posted 9/17/2026full-timeBarcelona • SpainSeniorWebsite

Core Competencies

Role fit
Core Competencies

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Demonstrates expertise in designing and delivering production-grade software, with a focus on AI-based solutions, cloud infrastructure, and modernizing legacy systems. Proficient in collaborating across teams to optimize product capabilities and improve engineering practices.

Highest-signal resume keywords
Senior-Level Software Engineering ExperienceAI Coding Agents IntegrationCloud Infrastructure and Distributed SystemsDomain-Driven Design (DDD)Experience with PHP and/or Python

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills
Production-Grade Software DesignAI and Machine LearningMicroservices ArchitectureModular System DesignScalable Code DevelopmentLegacy Code ModernizationTestable Code WritingEvent-Driven ArchitectureAsynchronous ProgrammingSaaS Application Development
Soft Skills
CollaborationMentoringCommunication
Tools & Technologies
KubernetesCeleryRedisCloud-Native ArchitecturesAgile Development
Industry Keywords
ECommerceRetailPrice Comparison

Tech Stack

Tools & technologies
CloudDistributed SystemsKubernetesMicroservicesPHPPythonRedis

About the role

Key responsibilities & impact
  • Join the Market Intelligence team alongside Senior Software Engineers and Software Engineers.
  • Design, build, and maintain new products and features for clients in collaboration with the Engineering Manager and Product Manager.
  • Explore and develop AI-based solutions using ML/DL models and LLMs to generate insights, solve complex problems, and automate or improve product capabilities.
  • Own projects from discovery and technical design through implementation, delivery, and continuous improvement.
  • Contribute to modernizing the legacy codebase toward a scalable, modular, event-driven, and asynchronous architecture.
  • Build systems that process large amounts of public web data to generate actionable customer insights.
  • Collaborate with User Experience, Infrastructure, Data, Support, and Customer Success teams.
  • Improve engineering practices, architecture, and technical standards; share knowledge and mentor less experienced engineers.
  • Develop products that optimize prices, monitor seller and contractual compliance, and track product prices and market changes.

Requirements

What you’ll need
  • Senior-level software engineering experience, with a strong track record of designing and delivering production-grade software.
  • Experience using AI coding agents as part of the software development workflow, with the ability to effectively review, validate, and improve AI-generated code.
  • Experience with cloud infrastructure and distributed systems, including technologies such as Kubernetes, queues (e.g. Celery), Redis, and similar tools.
  • Experience building and maintaining SaaS applications in a production environment.
  • Strong software engineering fundamentals, including writing maintainable, testable, scalable, and well-structured code.
  • Experience with Domain-Driven Design (DDD) and designing modular, domain-oriented systems.
  • Professional proficiency in English, both written and spoken.
  • Strong experience with PHP and/or Python.
  • Experience in eCommerce, Retail, or Price Comparison.
  • Experience working in an Agile development environment.
  • Experience with, or a strong interest in, AI and machine learning, including ML/DL models and LLM-based solutions.
  • Experience with microservices or service-oriented architectures.
  • Experience modernizing and modularizing legacy applications, including progressively extracting functionality into independent services.
  • Experience applying DDD principles to legacy codebases and large-scale refactoring.
  • Experience with Kubernetes migrations or cloud-native architectures.

Benefits

Comp & perks
  • Working Hours: Monday to Thursday from 9 am to 6 pm, Friday from 9 am to 3 pm.
  • Opportunities for quick career growth.
  • Gym membership discounts via Wellhub.
  • Private health insurance discounts.
  • Free organic fruit and coffee.
  • Fast-growing tech company environment with a young and international team.
  • Office with 360º views of the city.