Fintech Integrations Engineer - Banking & E-Invoicing

Aquaai Corporation; København; On-site; DKK 900,000 - 1,200,000; Full time

Benefits offered by this job

25 days annual leave

Company off‑sites

Career growth opportunities

Job summary

Light is hiring an Integrations Engineer to connect our platform to banking APIs, e‑invoicing networks, and tax platforms. You will design multi‑tenant integrations, manage data integrity, and ensure reliable reconciliation in production.

Bring 4–6 years of experience building integrations with external systems, familiarity with Kotlin/React stack, and a passion for shipping real software frequently.

Qualifications

• 4–6 years of experience ideally.
• You build real production software, not demos.
• Experience integrating external systems with unforgiving APIs.
• Knowledge of banking/payments APIs and ISO 20022 is valuable.
• You are excited about AI and how to apply it to development.
• Comfort across the stack, with a backend focus.

Responsibilities

• Build integrations to connect Light with banking, e‑invoicing networks and tax platforms.
• Design multi-tenant integrations where credentials and data are isolated per tenant.
• Map between formats and ensure compliance across networks.
• Ensure reliability with idempotency, retries and end‑to‑end reconciliation.
• Deliver iterative, real‑world changes and ship often.

Skills

Integration work

Banking APIs

Backend development

AI tooling

Tools

Kotlin

React

Job description

Light is hiring an Integrations Engineer to connect our platform to banking APIs, e‑invoicing networks, and tax platforms. You will design multi‑tenant integrations, manage data integrity, and ensure reliable reconciliation in production.

Bring 4–6 years of experience building integrations with external systems, familiarity with Kotlin/React stack, and a passion for shipping real software frequently.