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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Backend Developer - **Company:** Codeway Hq - **Location:** Barcelona, Spain - **Contract:** Permanent contract - **Skills:** Application Programming Interfaces (APIs), Artificial Intelligence, Amazon Web Services, Google App Engines, Application Integration Architecture, Audio Signal Processing, Microsoft Azure, BigQuery, Software Quality, Databases, Data Structures, Software Debugging, DevOps, Distributed Systems, Python (Programming Language), Machine Learning, Message Broker, Node.Js, Performance Tuning, RabbitMQ, WebSocket, WebRTC, Workflow Management Systems, Cloud Platform System, Large Language Models, Firebase, Backend, Event Driven Architecture, Containerization, Information Technology, Low Latency, Apache Kafka, Machine Learning Operations, Front End Software Development, Restful APIs, Amazon Simple Queue Service (SQS), Docker, Microservices - **Published:** October 3, 2026 - **Apply:** https://www.adzuna.es/details/5907661927 ## About the Role * Experience. 3+ years of professional experience as a Backend Engineer, with a track record of building consumer-facing products at scale. * Technical excellence. Strong hands-on proficiency in both Node.js and Python, with a deep understanding of CS fundamentals, data structures, algorithms, and system design. * System design. Experience designing and working with microservices architectures and RESTful APIs, with a solid grasp of databases, data modelling, performance optimisation, and security best practices. * Infrastructure knowledge. Hands-on experience with cloud environments such as GCP, AWS, or Azure (GCP and/or Firebase preferred), with strong production debugging and observability habits. * AI familiarity. Experience deploying and optimising AI models in production, including familiarity with external AI APIs and their performance considerations. * Scale. Ability to contribute effectively in high-scale environments handling large volumes of traffic and data, with strong problem-solving skills and attention to detail. * Communication. Proficiency in English and Turkish, with the ability to explain complex engineering decisions and trade-offs clearly to both technical and non-technical teams. * Education. A Bachelor's or Master's degree in Computer Science, Engineering, or a related field. Nice to have * Experience supporting mobile apps through backend APIs. * Experience with GCP tools such as Pub/Sub, Cloud Run, GKE, BigQuery, Cloud Functions, or App Engine. * Familiarity with containerisation and orchestration tools such as Docker and Kubernetes. * Experience with CI/CD pipelines and DevOps best practices. * Familiarity with SSE or WebSockets for real-time communication. * Experience with message brokers such as Kafka, RabbitMQ, or SQS. ## Description As a Software Engineer, Backend at Codeway, you will design, build, and operate the scalable backend services that power mobile apps and web experiences used by millions. You won't just write code; you will own features end-to-end - from initial system design and AI integration to deployment and production monitoring - with a strong focus on API quality, performance, and reliability. Our environment is fast-paced, and we value engineers who can turn complex architectural challenges into simple, elegant, and maintainable solutions. The ideal candidate will be comfortable building backend services for mobile products and working with API-heavy consumer apps. You will collaborate with mobile, product, AI, and DevOps teams to ship features end to end, bringing AI-powered capabilities into production where relevant. What You'll Be Doing * Design and implement scalable systems. Build high-performance backend architectures and microservices/RESTful APIs for mobile and web clients using Node.js and Python. * Own features end-to-end. Take full responsibility for the lifecycle of your services, from ideation and implementation through to deployment (GCP/Firebase) and continuous optimisation. * Integrate AI and media workflows. Deploy, monitor, and support LLMs and media workflows (STT/TTS, image/video/audio processing) in production, managing model serving, inference performance, and latency/cost tradeoffs. * Architect asynchronous workflows. Implement robust event-driven systems using queues and tasks to handle heavy media and AI workloads. * Simplify systems. Evaluate every component and process to remove unnecessary complexity and build minimalist, future-proof architectures. * Optimise performance. Proactively identify bottlenecks across distributed systems to improve latency, throughput, reliability, and costs. * Ensure backend quality. Establish robust error handling, security best practices, and end-to-end observability, and contribute to code quality through reviews, testing, and documentation. * Troubleshoot and stabilise. Debug issues and proactively improve system stability and observability in production environments. * Collaborate cross-functionally. Partner with Mobile, Frontend, Product, DevOps, and AI teams to design and ship impactful features. ## Related Videos - [Inside Bitpanda's Tech Stack: Scaling a European Fintech Leader - Markus Dorner](https://www.wearedevelopers.com/videos/1979-inside-bitpanda-s-tech-stack-scaling-a-european-fintech-leader-markus-dorner) - [Shifting Stress to Progress— Understanding DevOps to do DevOps Better](https://www.wearedevelopers.com/videos/268-shifting-stress-to-progress-understanding-devops-to-do-devops-better) - [Transforming Education: A Journey from interactive Markdown to Remote-Labs](https://www.wearedevelopers.com/videos/941-transforming-education-a-journey-from-interactive-markdown-to-remote-labs) - [Docker Compose: Rediscovered](https://www.wearedevelopers.com/videos/1978-docker-compose-rediscovered) - [Mobile vs. Backend DevOps](https://www.wearedevelopers.com/videos/1662-mobile-vs-backend-devops) - [Back(end) to the Future: Embracing the continuous Evolution of Infrastructure and Code](https://www.wearedevelopers.com/videos/440-back-end-to-the-future-embracing-the-continuous-evolution-of-infrastructure-and-code) ## Related Articles - [20 Essential Tools For Backend Development](https://www.wearedevelopers.com/magazine/218-20-essential-tools-for-backend-development) - [What’s the Difference Between Frontend and Backend Development?](https://www.wearedevelopers.com/magazine/240-what-s-the-difference-between-frontend-and-backend-development) - [Find a Developer Job: 12 Best Job Sites For Developers](https://www.wearedevelopers.com/magazine/165-find-a-developer-job-12-best-job-sites-for-developers) - [7 Most Popular Web Developer Jobs in Europe](https://www.wearedevelopers.com/magazine/163-7-most-popular-web-developer-jobs-in-europe) - [Backend Developer Salary in Germany [2023]](https://www.wearedevelopers.com/magazine/196-backend-developer-salary-in-germany-2023) - [The Most Popular IT Jobs on the Market](https://www.wearedevelopers.com/magazine/376-the-most-popular-it-jobs-on-the-market)