Senior Backend Engineer

Clera; München; On-site; EUR 80,000 - 120,000; Full time

Job summary

Clera is seeking a backend engineer to design and operate core infrastructure that connects tools and customer data for reliable AI agent workflows. You will own integrations, execution environments, and persistence, ensuring scalability and security.

The role emphasizes working with leadership on architectural decisions, hands-on contribution from week one, and direct user interaction to drive production improvements.

Qualifications

• Three+ years building and operating backend systems in production.
• Experience with designing for scale, reliability and failure.

Responsibilities

• Design and operate a tool gateway exposing connected APIs and MCPs through a composable Python SDK.
• Run persistent, isolated Linux sandboxes for workspaces that are secure and autoscaling.
• Own a durable, multi-tenant data layer designed for reliability and scale.
• Diagnose integration issues and implement systemic improvements to prevent recurrence.
• Collaborate with company leadership on technical decisions and ship improvements quickly.
• Engage with users and contribute to production work from day one.

Skills

Backend design

Distributed systems

Containers

Linux

Sandboxing

Python

OAuth

Webhooks

Multi-tenant

Infrastructure

Developer tools

Code execution

Tools

Modal

Job description

About the Role

Build and operate the backend systems that let AI agents reliably work with connected tools and customer data. You will own core infrastructure across integrations, execution environments, and persistence, helping make the agent dependable at scale.

What You'll Do

• Design and operate a tool gateway that exposes connected APIs and MCPs through a composable Python SDK, with routing, authentication, rate limits, and reliability built in.

• Run persistent, isolated Linux sandboxes for workspaces, making them secure, autoscaling, and cost-efficient.

• Own a durable, fast multi-tenant data layer designed to handle failures.

• Find and resolve integration issues, then improve systems to prevent them from recurring.

• Work directly with company leadership on technical decisions and ship improvements quickly.

• Talk with users and contribute to production work from your first week.

What We're Looking For

• At least three years of professional engineering experience building and operating backend systems in production.

• Strong distributed systems experience, including designing for scale, reliability, and failure.

• Experience with containers, Linux internals, sandboxing, and safely running untrusted code.

• Fluency in Python and experience building Python services; familiarity with Modal is valuable.

• Hands‑on experience with OAuth, webhooks, rate limits, and third‑party API integrations.

• Experience designing and building multi‑tenant systems, with attention to durability, cost, and failure isolation.

• Background in infrastructure, platform, developer tools, or code execution systems.

Compensation & Benefits

Visa sponsorship is not available.

Location

On‑site in Munich, Germany or Warsaw, Poland. The primary location for this role is Munich.