Senior Backend Engineer | AI Fintech Start-up | Remote EU

Oliver Bernard; Spain; Remote; EUR 125,000 - 222,000; Full time

Job summary

Oliver Bernard is seeking a backend engineer for an AI-native fintech scale-up. You will design and ship end-to-end backend systems and APIs that run real-time accounting logic, owning architecture and CI/CD, testing and monitoring. This role is fully remote within the EU and offers significant equity.

Must have 5+ years in backend, strong PostgreSQL/SQL/ORM skills, AWS deployment, and a fast-paced, high-agency work culture. Python plus FastAPI/Flask/Django is a bonus.

Qualifications

• 5+ years backend experience with complex business logic
• Deep experience with complex business logic products
• Strong database skills: PostgreSQL, SQL, ORMs, migrations and schema design
• Experience deploying on AWS with solid CI/CD and production-readiness
• Hardcore work ethic and high agency
• Pragmatic, fast-moving and data-driven decision making
• Python and a modern web framework (FastAPI, Flask or Django) is a bonus

Responsibilities

• Design and ship end-to-end backend systems and APIs handling real-time accounting logic
• Own architecture, CI/CD, testing and monitoring from development to production
• Move fast in a VC-backed fintech environment with high trust and fast feedback loops

Skills

Backend engineering

Complex business logic

PostgreSQL

SQL

ORMs

Migrations

Schema design

AWS deployment

CI/CD

Work ethic

Decision making

Python

FastAPI

Flask

Django

Job description

I'm working with a VC-backed, rapidly scaling AI-native fintech start-up that is rebuilding the financial system of record for modern businesses. Backed by top-tier US investors, they've grown quickly in a short space of time, serving customers from high-growth companies through to publicly traded enterprises.

You'll be building and shipping end to end: designing backend systems and APIs that run real-time, business-critical accounting logic, owning everything from architecture and CI/CD through to testing and monitoring. The team deploys daily, moves fast and never waits for permission.

We're Looking For

• 5+ years' backend engineering experience (language agnostic)
• Deep experience with complex business logic products
• Strong database skills: PostgreSQL, SQL, ORMs, migrations and schema design
• Experience deploying on AWS (or similar), with solid CI/CD and production-readiness fundamentals
• Hardcore work ethic and high agency
• Pragmatic, fast-moving and curious, someone who makes decisions based in reality, not theory
• Python and a modern web framework (FastAPI, Flask or Django) is a bonus

Key Info

• Fully Remote | EU
• $140k-$250k base + equity
• B2B or EOR
• VC-backed | Rapidly scaling | Significant equity ownership
• High-speed, high-trust environment | Your feedback shapes the product directly