Fortnox Tech Stack

ERP and accounting software platform for Swedish mid-market companies

Software Development Växjö 501–1,000 employees Founded 2001 Public Company

Fortnox operates a SaaS ERP platform serving mid-market Swedish businesses with modules spanning accounting, invoicing, CRM, and administration. The tech stack spans Python, Java, Kotlin, Go, and Node.js across GCP, Postgres, Kafka, and BigQuery—a polyglot, data-heavy architecture. Active adoption of Spring Boot, React, and Java alongside displacement of Project Reactor and RxJava signals a shift toward simpler reactive patterns. The hiring profile is engineering-led (26 of 64 open roles), with concurrent focus on a data platform redesign, AI integration into product, and data security compliance—all pointing toward modernizing a legacy accounting product for AI-driven features and regulatory rigor.

Tech Stack 53 technologies

Core StackPython dbt Fivetran BigQuery PostgreSQL Kafka Java Kotlin Go PHP Node.js JavaScript React React Native TypeScript Docker Kubernetes GitHub GitHub Copilot Bitbucket Cursor Looker Power BI SQL GCP Backbone.js REST ChatGPT Claude Qlik+17 more

AdoptingJava React Spring Boot

ReplacingProject Reactor RxJava

What Fortnox Is Building

◆Challenges

Data security compliance
Scaling data platform for expanding business
Digitalizing compliance processes
Developing modern credit framework
Scaling development organization
Integrating ai into accounting products
Improving development processes
Scaling internal identity management
Multidimensional access structures
Granular permission management

▲Active Projects

Core services authorization engine
Design and scale data platform
Ai platform
Data security compliance initiatives
Microservice architecture design
Ai implementation for internal staff
Internal system integration
Implement credit provisioning (ecl)
Data democratization
Employer branding activities

Hiring Activity

Steady65 roles · 25 in 30d

Department

Engineering

Product

Finance

Data

Sales

Support

Legal

Seniority

Senior

Mid

Junior

Manager

Lead

Notable leadership hires: Tech Lead, Communication Lead

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About Fortnox

Fortnox is Sweden's leading provider of cloud-based business software, serving small-to-mid-market companies, associations, and accounting firms. The platform integrates accounting, invoicing, CRM, and administrative workflows into a single SaaS offering. Founded in 2001 and headquartered in Växjö, the company operates as a public company with 501–1,000 employees, all hired within Sweden. Core products are designed for ease of use while supporting complex business operations; specialization spans e-invoice handling, audit readiness, and financial process automation.

HeadquartersVäxjö

Company Size501–1,000 employees

Founded2001

Hiring MarketsSweden

Frequently Asked Questions

What tech stack does Fortnox use?

Fortnox runs Python, Java, Kotlin, Go, and Node.js on GCP with Postgres and BigQuery for data. Data pipeline relies on Kafka, dbt, and Fivetran. Frontend uses React, React Native, and TypeScript. DevOps runs on Kubernetes and Docker.

What is Fortnox working on?

Active initiatives include a data platform redesign, AI integration into accounting products, microservice architecture, credit provisioning frameworks, and data security compliance. Internal projects span AI implementation for staff and identity management scaling.