Senior Software Engineer: Scale the Accounting Platform

Flatpay; Herlev Kommune; On-site; DKK 1,000,000 - 1,400,000; Full time

Benefits offered by this job

Free slush ice

On-site gym

Gamer room

Job summary

Flatpay in Copenhagen is expanding its Accounting and Bookkeeping domain with a Senior Software Engineer who will shape the technical direction of the platform and ensure scalable, reliable finance data processing for merchants.

You’ll own features end-to-end, drive architecture decisions, collaborate with product and other engineers, and help Flatpay scale across markets with robust APIs, services, and observability.

Qualifications

• 7+ years of professional software engineering experience.
• Experience designing and operating distributed systems.
• Demonstrated ability to lead technical projects involving multiple engineers and influence architectural decisions.
• Experience building scalable backend platforms and APIs, especially ones that integrate with internal and third‑party systems.
• Comfortable navigating ambiguity and helping shape new products and systems.
• Strong communication and collaboration skills.
• Experience within payments, accounting and bookkeeping systems, or financial data platforms is a plus.

Responsibilities

• Design and build scalable systems that power Flatpay’s accounting and bookkeeping capabilities.
• Lead feature and platform initiatives involving multiple engineers, driving delivery from discovery through production.
• Take ownership of features from design and implementation through deployment and maintenance.
• Drive architectural decisions and long-term technical improvements.
• Build APIs, services, and data models that handle financial data accurately and at scale.
• Improve reliability, observability, performance, and security across the platform — with particular attention to the accuracy and consistency that financial data requires.
• Partner with engineers, product managers, and stakeholders to drive technical and product outcomes.
• Help establish engineering standards and best practices as the Accounting and Bookkeeping domain grows.

Skills

Distributed systems

Technical leadership

Backend APIs

Communication

Payments domain

Tools

Java

Spring Boot

MySQL

REST APIs

Docker

AWS

TypeScript

React

CI/CD

GitHub Actions

ECS

Observability

Job description

Flatpay in Copenhagen is expanding its Accounting and Bookkeeping domain with a Senior Software Engineer who will shape the technical direction of the platform and ensure scalable, reliable finance data processing for merchants.

You’ll own features end-to-end, drive architecture decisions, collaborate with product and other engineers, and help Flatpay scale across markets with robust APIs, services, and observability.