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Platform Engineer

Platform Engineer

Senior Full Stack Engineer (Python / React / Temporal)

ARNIA

Bucharest

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Role description

Some engineering roles ask you to build features.

This one asks you to build the platform.

We’re assembling a brand-new engineering team responsible for creating the foundations of an Agentic Case Management platform—combining intelligent backend services with modern user experiences that enable the next generation of AI-powered applications.

If you’re passionate about building products end-to-end, enjoy owning both backend and frontend challenges, and want to help shape a platform from day one, we’d love to hear from you.

What you’ll be building

As a Senior Full Stack Engineer, you’ll help design and deliver the core building blocks of an Agentic AI platform.

You’ll develop scalable Python/FastAPI microservices alongside modern React applications, orchestrated through Temporal workflows and running on Microsoft Azure.

You’ll work on greenfield solutions where architecture, engineering quality, and product thinking matter just as much as writing code.

Your responsibilities

  • Design and develop scalable backend services using Python and FastAPI.
  • Build modern frontend applications using React.
  • Design robust APIs consumed by internal and external applications.
  • Implement long-running workflows using Temporal.
  • Collaborate closely with architects and product stakeholders.
  • Contribute to architecture and technical design decisions.
  • Develop reusable components across backend and frontend.
  • Ensure performance, maintainability and scalability.
  • Deliver production-ready software in short iterative cycles.
  • Leverage GenAI development tools to improve delivery quality and speed.

What we’re looking for

Required

  • Strong experience with Python.
  • Solid experience building APIs using FastAPI.
  • Strong React development experience.
  • Experience building modern microservice architectures.
  • Experience working with Azure.
  • Strong understanding of REST APIs.
  • Experience with distributed systems.
  • Good software architecture skills.
  • Experience with Git and CI/CD.
  • Excellent communication skills in English.

Highly desirable

  • Temporal.
  • Event-driven architecture.
  • Azure APIM.
  • Azure OpenAI.
  • Docker & Kubernetes.
  • AI Agents.
  • Microservice orchestration.

Our engineering culture

We’re looking for engineers who enjoy building products—not simply delivering tickets.

You’ll work in an environment where ownership is encouraged, architecture discussions are open, and modern AI tooling is part of everyday engineering.

Cursor, Claude Code, OpenAI Codex and similar tools are considered accelerators that help experienced engineers deliver faster while maintaining full accountability for the final product.

Why join this team?

You’ll have the opportunity to:

  • Join a brand-new engineering team.
  • Shape an AI platform from the ground up.
  • Work across backend and frontend.
  • Build products using modern AI technologies.
  • Influence architecture and engineering standards.
  • Deliver meaningful solutions instead of maintaining legacy systems.
    Share this job:
    relocation package
    competitive compensation packages
    performance bonuses
    flexible working hours
    job rotation
    learning through Arnia Academy
    attractive projects
    trainings
    international work experience
    referral program
    medical benefits

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