Staff Backend Engineer — Financial Systems (Economic Core)

Location: Europe (Remote)
Company: Voyagu
Product: Radar

Voyagu is a travel-tech company building Radar, a production platform that has been operating for over five years and is now evolving into a multi-agency SaaS system.

We are looking for a Staff Backend Engineer to own the financial core of the platform — the system responsible for revenue calculations, payments, costs, and ledger-style financial events.

This role focuses on financial systems architecture, not generic backend development.

The challenge is evolving a complex production system into a structured, ledger-driven financial platform while ensuring deterministic profit and financial correctness.

What you will work on

You will take ownership of the Economic Core of the platform and help shape how financial logic is implemented across the system.

Key areas include:

• ledger-style economic events
• revenue and profit calculation logic
• payment and cost normalization
• client and supplier balances
• financial lifecycle transitions
• enforcing financial invariants and consistency rules

You will join during an active architectural transformation where the financial foundation of the platform is being redesigned.

Tech Stack:

We operate in a distributed, event-driven environment with a strong focus on transactional consistency and data correctness.
For this role, prior experience with financial or transactional systems is more important than specific technologies.

• Python (backend services)
• PostgreSQL (core data layer, complex relational modeling)
• AWS (Lambda, SQS, S3)
• Infrastructure as Code (AWS CDK)

What we are looking for

We are looking for engineers who have built real financial or transactional systems.

Ideal background includes experience with:

• payment platforms
• fintech systems
• billing infrastructure
• marketplaces with financial flows
• accounting or ERP systems
• subscription billing platforms

Requirements:

• 8+ years of backend engineering experience
• experience owning financial or transactional domain logic
• experience evolving financial systems in production
• strong relational database design skills
• ability to reason about money flows, balances, and reconciliation

Why this role matters

The Economic Core is the financial spine of the platform.

Correct financial architecture determines:

• revenue correctness
• platform scalability
• ability to evolve into SaaS
• reliability of business operations

This role has direct architectural ownership of the financial foundation of Radar.

Hiring Process

Recruiter screening

Domain system interview

Architecture deep dive

Final ownership discussion