Senior AI-First Full-Stack Engineer — Remote

5Blue Software; Portugal; On-site; EUR 60,000 - 90,000; Full time

Benefits offered by this job

Flexible work env

English classes

Premium medical insurance

Great international team

Equipment provided

Accounting support

Paid time off

Flexible payment

Job summary

5Blue Software is seeking a Senior Full-Stack Developer specializing in AI-first SaaS. You’ll own features from idea to production across React frontend and Node.js backend, with TypeScript and REST API expertise.

You’ll build AI-powered capabilities and integrate them into a scalable B2B platform in a remote-friendly environment. You’ll collaborate with an international engineering team across Europe, Israel, and South Africa, participate in design decisions, and ensure code quality while

Qualifications

• 5+ years of professional software development experience.
• Strong experience with Node.js and React.
• Solid knowledge of TypeScript.
• Experience building and integrating REST APIs.
• Experience developing AI-powered features in production.
• Experience using AI coding assistants (Claude Code, Copilot, etc.).
• Good understanding of software engineering fundamentals, testing, debugging, and code quality.
• Experience with cloud environments and CI/CD.
• Understanding of scalable and distributed systems.
• English (C1) or higher with strong communication skills and ability to discuss technical topics.

Responsibilities

• Build and deliver full-stack features end to end using React, TypeScript, and Node.js.
• Develop intuitive, performant frontend experiences for a complex B2B SaaS product.
• Implement backend services, APIs, business logic, and third-party integrations.
• Develop and integrate AI-powered product features.
• Participate in system design and architectural decisions.
• Use AI-assisted development tools as part of daily workflow.
• Review, debug, test, and improve AI-generated code while owning implementation.
• Take responsibility for CI/CD and DevOps aspects of features.
• Collaborate with Engineering and Product to define requirements and technical solutions.
• Participate in Agile ceremonies and work with a distributed international team.
• Communicate technical decisions clearly in English.

Skills

Node.js

React

TypeScript

REST APIs

AI features

CI/CD

Cloud platforms

English (C1)

SaaS experience

Distributed systems

Tools

Docker

Kubernetes

LangChain

LangGraph

GitHub Copilot

Job description

5Blue Software is seeking a Senior Full-Stack Developer specializing in AI-first SaaS. You’ll own features from idea to production across React frontend and Node.js backend, with TypeScript and REST API expertise.

You’ll build AI-powered capabilities and integrate them into a scalable B2B platform in a remote-friendly environment. You’ll collaborate with an international engineering team across Europe, Israel, and South Africa, participate in design decisions, and ensure code quality while