Full-Stack Engineer: Build Scalable APIs & Data Pipelines

INFUSE; Valencia; On-site; EUR 40,000 - 60,000; Full time

Benefits offered by this job

Reduced working hours on Fridays

Schedule: 1 PM - 9 PM EET

Job summary

INFUSE in Valencia is seeking a Mid-level Full Stack Developer to drive end-to-end delivery in our PMO department, leading a cross-functional team and shaping architecture for high-quality, on-time releases. You will build frontend with React or Vue, design robust backend APIs, and manage databases (PostgreSQL, MongoDB, Redis, S3) while integrating third-party services and building data pipelines.

This role values Python and Node.js, REST/GraphQL APIs, AWS, Git, CI/CD, and a startup mindset with

Qualifications

• Mid-level+ hands-on experience with modern frontend frameworks (React and/or Vue).
• Strong backend development skills, including API design and database management (PostgreSQL and/or MongoDB; Redis; S3)
• Strong command of Python and Node.js; experience building REST and/or GraphQL APIs
• Proficiency with AWS and Git; comfortable working with CI/CD pipelines
• Daily, practical use of AI coding assistants ("Claude", "Cursor", "GitHub Copilot", or similar); understanding of strengths/limitations across tools
• Architecture-focused mindset: scalable systems, clean integration points, long-term maintainability
• Startup mindset: comfortable with ambiguity, fast iteration, and wearing multiple hats
• Experience with data/web scraping, MarTech, or SalesTech (highly desirable)
• Proficiency in Ukrainian and/or Russian language
• English proficiency at B2 level or higher.

Responsibilities

• Drive the full product lifecycle - from rapid MVP scoping through maintainable production release
• Build responsive, well-crafted frontend components using modern frameworks
• Design and develop robust, scalable backend APIs and databases built for long-term maintainability
• Integrate and manage third-party APIs, ensuring seamless, reliable data flow
• Analyze data and build efficient data pipelines (strongly preferred)
• Collaborate with cross-functional teams to translate business requirements into clean technical solutions.

Skills

React

Vue

Python

Node.js

REST APIs

GraphQL APIs

AWS

Git

CI/CD

Ukrainian

Russian

English (B2+)

Tools

PostgreSQL

MongoDB

Redis

S3

Job description

INFUSE in Valencia is seeking a Mid-level Full Stack Developer to drive end-to-end delivery in our PMO department, leading a cross-functional team and shaping architecture for high-quality, on-time releases. You will build frontend with React or Vue, design robust backend APIs, and manage databases (PostgreSQL, MongoDB, Redis, S3) while integrating third-party services and building data pipelines.

This role values Python and Node.js, REST/GraphQL APIs, AWS, Git, CI/CD, and a startup mindset with