Senior Backend Software Engineer (Node.js & Python) - Consumer AI Apps

Codeway • Spain

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AI Summary

Design, build, and operate scalable backend services powering mobile and web apps used by millions, with a focus on API quality, performance, and reliability. Own features end-to-end, from system design and AI integration to deployment and production monitoring, collaborating with cross-functional teams. Requires 3+ years of backend engineering experience, strong Node.js and Python skills, and expertise in microservices, cloud infrastructure (GCP preferred), and AI model deployment.

Key Highlights

Own features end-to-end, from design to production monitoring

Integrate AI and media workflows (LLMs, STT/TTS, image/video processing) into production

Work with a high-caliber international team building category-defining consumer AI apps

Full-time contract with competitive salary, private health insurance, and relocation support

Key Responsibilities

Design and implement scalable systems, building high-performance backend architectures and microservices/RESTful APIs for mobile and web clients using Node.js and Python.

Own features end-to-end, taking full responsibility for the lifecycle of services from ideation and implementation through deployment (GCP/Firebase) and continuous optimisation.

Integrate AI and media workflows, deploying, monitoring, and supporting LLMs and media workflows (STT/TTS, image/video/audio processing) in production, managing model serving, inference performance, and latency/cost tradeoffs.

Architect asynchronous workflows, implementing robust event-driven systems using queues and tasks to handle heavy media and AI workloads.

Simplify systems by evaluating every component and process to remove unnecessary complexity and build minimalist, future-proof architectures.

Optimise performance by proactively identifying bottlenecks across distributed systems to improve latency, throughput, reliability, and costs.

Ensure backend quality by establishing robust error handling, security best practices, and end-to-end observability, and contribute to code quality through reviews, testing, and documentation.

Troubleshoot and stabilise by debugging issues and proactively improving system stability and observability in production environments.

Collaborate cross-functionally with Mobile, Frontend, Product, DevOps, and AI teams to design and ship impactful features.

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Technical Skills Required

Node.js Python Microservices

Benefits & Perks

Full-time contract with competitive salary

Private health insurance

Generous meal card

Full visa & relocation support if moving to Barcelona

Annual learning & development budget

Wellness perks including sports budget and psychological consultations

Free access to Codeway's suite of apps

Top-notch office in the heart of the city

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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.

Job Description

Codeway builds category-leading consumer AI apps on mobile and web, at global scale.600M+ downloads. 60+ apps. 400+ builders across Barcelona and İstanbul. Completely bootstrapped. No board. Profitable since year two.Small teams move faster than big ones. But they need big resources to win at scale. Nobody starts from zero. The problem decides the solution, not us.We turn category wins into six focused vertical companies: Wishlabs (AI Creativity), Wellture (Wellness), Learna (Education), Sparked (Media), Cosmic Jam (Entertainment), and Catalyst Apps (Utilities & Productivity). Each has full ownership and the depth to go further than anyone else in its space.

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Job Overview

Posted Date Sep 30, 2026

Employment Type Full-time

Experience Level Not Applicable

Location Spain

Category Programming

Company Codeway

Mentioned Skills

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