Senior Full Stack AI-first Saas Engineer

• 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 , with roughly 5+ years of experience with Node.js as a guide rather than a hard line. Real depth in a closely related stack can also count.

2+ years of professional experience with React as a guide.

Strong experience with TypeScript .

Hands-on experience with Express, Fastify, or a similar API framework .

Strong full-stack capabilities and the ability to work comfortably across frontend and backend, even with a natural lean toward one side.

Production experience with microservices architecture.

Working familiarity with AWS or a comparable cloud provider such as GCP or Azure.

Hands-on experience with both relational and non-relational databases , such as PostgreSQL and MongoDB or similar.

Experience integrating third-party REST APIs into a production system, beyond just building your own API endpoints.

Real experience shipping AI-powered features in a live product , not just experimenting with AI on personal projects.

Experience using AI tools such as Claude Code or similar as a genuine part of your development workflow, balanced with the ability to write and debug code yourself, unaided, live.

Working proficiency in DevOps, QA, and CI/CD at the level expected of a senior engineer, not a dedicated DevOps hire.

Strong spoken English, comfortable holding a real-time technical conversation such as a system design discussion.

A background from a product or SaaS company rather than a project-based agency. Experience in security, compliance, GRC, or developer-tools SaaS is a natural fit, though not required.

Nice to have:

Experience with LangChain, LangGraph, or a comparable agent/AI framework .

Python experience alongside your primary stack.

Experience with Docker, Kubernetes, or containerization more broadly.

A CS / Software Engineering academic background.

A track record as the front-end "champion" on a full-stack team: someone who can carry that surface area while still holding their own on the backend.

• What we offer:
• — Flexible Work Environment: Opportunity to work remotely.
• — 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.