Backend Engineer

Wwshemi; München; Hybrid; EUR 90,000 - 130,000; Full time

Job summary

Wwshemi in Munich, Germany is seeking a backend engineer to design and operate the core systems behind AI agent orchestration. You will own infrastructure spanning API integrations, execution environments, and multi-tenant data, delivering reliability and performance in a fast-paced environment.

You will build Python services, run Linux sandboxes, and collaborate with leadership to make technical decisions.

Qualifications

• Experience building and operating production backend systems.
• Hands-on sandboxing and OS-level isolation knowledge.
• Experience building Python services and using Modal.
• Experience integrating third-party APIs (OAuth, webhooks, rate limits).
• Experience designing multi-tenant systems.
• Background in infrastructure, platform, reliability engineering, or code execution systems.

Responsibilities

• Design and operate a tool gateway exposing APIs and MCP integrations through a composable Python SDK.
• Run persistent Linux sandboxes for workspaces with emphasis on security and autoscaling.
• Build and maintain durable, high-performance data systems for multi-tenant state and persistence.
• Identify integration failures, resolve them, and improve architecture to prevent recurrence.
• Collaborate with leadership on technical decisions and deliver improvements at a fast pace.
• Engage with users and contribute directly to shipped backend work.

Skills

Backend systems

Distributed systems

Sandboxing

Python services

OS-level isolation

Containers

OAuth & Webhooks

Multi-tenant design

Reliability engineering

Tools

Modal

Job description

About the Role

Build and operate the backend systems that help AI agents turn user requests into reliable work across connected services. You will own core infrastructure spanning API integrations, execution environments, and multi-tenant data, with a direct impact on system reliability and user outcomes.

What You'll Do

• Design and operate a tool gateway that exposes connected APIs and MCP integrations through a composable Python SDK, including routing, authentication, rate limits, and reliability features.
• Run persistent, isolated Linux sandboxes for workspaces, with a focus on security, autoscaling, and cost efficiency.
• Build and maintain durable, high-performance data systems for multi-tenant state and persistence.
• Identify integration failures, resolve them, and improve system architecture to prevent recurring issues.
• Work closely with company leadership on technical decisions and deliver improvements at a fast pace.
• Engage with users and contribute directly to shipped backend work.

What We're Looking For

• Experience building and operating production backend systems, including distributed systems designed for scale and reliability.
• Hands-on expertise with sandboxing and OS-level isolation, including containers, Linux internals, and safely running untrusted code.
• Experience building Python services and comfort using Modal for infrastructure.
• Experience integrating third-party APIs, including OAuth, webhooks, and rate limits.
• Experience designing multi-tenant systems, with attention to durability, cost, and failure isolation.
• A background in infrastructure, platform, developer tools, reliability engineering, or code execution systems.

Compensation & Benefits

Visa sponsorship is not available.

Location

On-site in Munich, Germany.