Senior Full Stack AI-first Saas Engineer

5Blue Software; Portugal; Remote; 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

Hi there! We are currently looking for a strong Full-Stack Developer-AI-First SaaS Engineer.

Full-Stack Developer-AI-First SaaS Engineer

About Us

5Blue Software is an Israeli-Ukrainian software development company specializing in custom software development, staff augmentation, dedicated engineering teams, AI solutions, and CTO-as-a-Service. We help startups and mid-sized companies scale faster with vetted engineering talent across Europe.

Hi there! We are currently looking for a strong Full-Stack Developer-AI-First SaaS Engineer.

About Us

5Blue Software is an Israeli-Ukrainian software development company specializing in custom software development, staff augmentation, dedicated engineering teams, AI solutions, and CTO-as-a-Service. We help startups and mid-sized companies scale faster with vetted engineering talent across Europe.

About the project

Join a fast-growing AI-first product company building a B2B SaaS platform that helps organizations simplify security, compliance, and AI governance.

The platform automates processes that traditionally require significant manual work — from evidence collection and monitoring to audit preparation and certification workflows.

You’ll join a lean, highly collaborative international engineering team distributed across Europe, Israel, and South Africa.

About the role

We’re looking for a Senior Full-Stack Developer who is comfortable working across both frontend and backend and enjoys taking ownership of features from idea to production.

This is an AI-first engineering environment. AI is used both as part of the product and as a standard part of the development workflow. You’ll use AI-assisted development tools to accelerate implementation, debugging, testing, and refactoring while maintaining strong engineering judgment and the ability to write and understand code independently.

You’ll work closely with Engineering and Product on system design, architecture, and feature development, with a particular focus on building high-quality React experiences while contributing confidently to the backend.

What you’ll do

• Build and deliver full-stack features end to end using React, TypeScript, and Node.js.
• Develop intuitive, performant, and scalable 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 such as Claude Code or similar as part of your everyday workflow.
• Review, debug, test, and improve AI-generated code while maintaining ownership of the implementation.
• Take responsibility for the CI/CD and DevOps aspects of the features you build.
• Work closely with Engineering and Product to define requirements and technical solutions.
• Participate in Agile ceremonies and collaborate with a distributed international team.
• Communicate technical decisions clearly and confidently in English.

What we’re looking for

• 5+ years of professional software development experience.
• Strong experience with Node.js and React.
• Solid knowledge of TypeScript.
• Experience building and integrating REST APIs.
• Strong full-stack capabilities and the ability to work comfortably across frontend and backend.
• Experience developing and shipping AI-powered features in a production environment.
• Practical experience using AI coding assistants such as Claude Code, Cursor, GitHub Copilot, or similar tools.
• 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 verbal and written communication skills and the ability to confidently discuss technical and architectural topics in real time.
• Experience working in a product or SaaS environment.

Nice to have

• Experience with Python.
• Experience with AWS or another major cloud provider.
• Familiarity with Docker, Kubernetes, or microservices.
• Experience with LangChain, LangGraph, or similar AI/agent frameworks.
• Experience building high-scale SaaS products with complex, polished UIs.
• Background in security, compliance, GRC, or developer tools.
• Experience taking ownership of the frontend area within a full-stack team.
• Experience with automated testing and QA practices.

What we offer

• Flexible Work Environment: Opportunity to work remote.
• 1:1 English Classes: Individual English language training.
• Premium Medical Insurance: Comprehensive health insurance.
• Great Team: Supportive, collaborative, and dynamic international team.
• Equipment Provided: All necessary equipment supplied.
• Accounting Support: Full accounting assistance in Ukraine and Poland.
• Paid Time Off: 18 days of annual vacation and 7 days of sick leave without a doctor's note.
• Flexible Payment System: Convenient payment solution with multiple withdrawal options.

If you’re a strong full-stack engineer who enjoys building real products, taking ownership, and using AI to become a more effective developer — we’d love to hear from you.