Full Stack Engineer

OnHires; Zaragoza; A distancia; EUR 60.000 - 90.000; Jornada completa

Descripción de la vacante

A growing SaaS company is seeking a Senior Full-Stack Engineer to lead the development of core products including scalable checkout systems and AI conversational agents. You will have full ownership from architecture to deployment in a fast-moving environment. This fully remote position offers autonomy and the opportunity to impact product direction significantly.

Servicios

Full ownership from architecture to deployment

Fast-moving environment, zero bureaucracy

Optional retreats in Alps & Mediterranean

High-trust culture focused on autonomy and accountability

Formación

• 6+ years of full-stack experience (React + TypeScript + Python).
• Strong understanding of AWS and serverless architectures.
• Proven record in SaaS / B2B startups or platforms.
• EU-based, with right to work in the EU.
• Curious, proactive, product-minded engineer who thrives in autonomy.

Responsabilidades

• Lead development of core products including OCR platforms and high-traffic APIs.
• Own architecture, performance, and deployment across a modern serverless stack.
• Collaborate directly with founders to shape product strategy.
• Maintain and evolve existing services for reliability and performance.

Conocimientos

Full-stack development

React

Python

AWS

Serverless architectures

Herramientas

PostgreSQL

DynamoDB

Firebase

Descripción del empleo

Senior Full-Stack Engineer | SaaS | Python | React | AWS | Remote (EU)

A fast-growing European SaaS company transforming how consumers manage broadband, mobile, energy, streaming, and financial subscriptions. Our platform powers real-time comparison, bill analysis, and subscription management for hundreds of thousands of users monthly. We’re entering a new expansion phase across Europe, scaling rapidly and integrating AI capabilities.

Your Impact

• Lead development of core products, including OCR platforms (500K bills processed), scalable checkout systems, high-traffic APIs (300K+ monthly checks), and AI conversational agents.
• Own architecture, performance, and deployment across a modern serverless stack.
• Collaborate directly with founders to shape product strategy and technical direction.
• Maintain and evolve existing services for reliability, scalability, and performance.

Tech Stack

• React + TypeScript (Redux, Material-UI, Vite)
• Python (Serverless Framework)
• PostgreSQL, DynamoDB
• AWS (Lambda, API Gateway, S3, CloudFront, CloudWatch, IAM, VPC, SQS), Firebase
• LLMs via API (Claude Code, Cursor, or similar)

Requirements

• 6+ years of full-stack experience (React + TypeScript + Python)
• Strong understanding of AWS and serverless architectures
• Proven record in SaaS / B2B startups or platforms
• EU-based, with right to work in the EU
• Curious, proactive, product-minded engineer who thrives in autonomy

Why Join

• Full ownership from architecture to deployment
• Product-driven, small team with direct impact
• Fast-moving environment, zero bureaucracy
• Profitable, scaling across Europe
• Fully remote, optional retreats (Alps & Mediterranean), high-trust culture focused on autonomy and accountability