With Tess (gotess.de) we are building the first AI-agent for SMB-accounting on top of DATEV (Germany's most widely used legacy accounting software). Leveraging LLMs and AI-powered automation, Tess empowers accounting firms to close financials in record speed, thereby helping accounting firms tackle an industry-wide shortage of skilled talent.

We are growing extremely fast: We already serve >120 accounting firms , >500 bookkeepers and process >10,000 invoices per day .

As Backend Engineer , you’ll partner directly with Lukas, our Founder & CTO , and play a pivotal role in building the backbone of our AI-driven accounting engine. You’ll be close to the core logic, the data, the integrations — and the accounting magic. You will:

Architect and expand the backend services that power document processing, reconciliation, and workflow automation
Build reliable, high-throughput pipelines that ingest, normalize, and enrich accounting data
Integrate deeply with DATEV and third-party financial systems
Work closely with frontend and AI teams to deliver features end-to-end
Own systems across their lifecycle — from design to deployment to continuous iteration
Ensure our platform is fast, secure, resilient, and ready to scale with 10x more volume

What You Bring

Solid backend engineering track record building and scaling data-heavy, business-critical applications
Strong experience with modern backend stacks
Familiarity with databases, event-driven architectures, APIs, and distributed systems
Ideally hands-on experiences working with Large Language Models (LLMs) on business cirtical tasks
A strong ownership mindset — you ship, you iterate, you raise the bar
Excellent English communication (German not required)

What We Offer

Real product ownership: Come in early and shape core platform architecture
Senior-level mentorship: Work closely with seasoned founders and engineers
Category-defining potential: Build infrastructure that could power tens of thousands of SMBs

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