Backend Engineer (Kotlin)

Location: Utrecht Office, Netherlands; work from the Utrecht office at least 4 days a week, preferably 5.

Company

hirify.global provides metering, pricing, billing, and invoicing for AI and cloud-native companies, turning customer usage data into accurate invoices.

What you will do

• Build systems that transform billions of usage events into revenue.
• Calculate invoices for complex pricing models, including tiers, commitments, credits, overrides, and mid-cycle changes.
• Design and build integrations with payment providers, tax engines, e-invoicing networks, CRMs, and ERPs.
• Design, ship, run, and support features end to end in production.
• Resolve customer blockers, including issues outside backend engineering.

Requirements

• Take ownership, move quickly, and make decisions with incomplete information.
• Understand the importance of edge cases in revenue systems, including retries, partial failures, and unexpected user behavior.
• Use AI tools effectively to complete the work.
• Work effectively in a startup or other low-process, high-ownership environment.
• Be comfortable working closely with other people in the Utrecht office.
• Hiring is based on ability rather than years of experience; experience with the listed tools is helpful but not required.

Nice to have

• Experience with Kotlin, Ktor, PostgreSQL, Kafka, ClickHouse, GCP, or AI agents.

Culture & Benefits

• Full-time, permanent contract with responsibility from day one.
• Low-process, high-ownership environment with substantial individual responsibility.
• Competitive salary and leave, free lunch, and barista coffee.
• Generous equity package and opportunities for growth.
• Small Utrecht-based team with experienced founders and direct ownership of product areas.

Hiring process

• 30-minute introductory call.
• Take-home case involving a small problem from hirify.global's domain.
• Case review with two engineers covering decisions, correctness under load and failure, and business judgment.
• Application requires a CV and plain-word motivation describing what was built, for whom, and what changed; buzzwords should be omitted.