Backend & integrations
Services and APIs, systems integration and event-driven solutions. Building new software and working with the systems you already have.
Java, Kotlin, Spring Boot, Kafka, PostgreSQL
Backend and cloud, from architecture to production.
Trefjorton is an independent consultancy in software development, cloud and architecture. Development is primarily in Java and Kotlin, using Spring Boot. AI agents are used daily for code and infrastructure work. Alongside consulting, Trefjorton builds its own products, putting new technologies and ways of working into practice.
Supporting an existing team or taking responsibility for a defined part of the development. Code that goes all the way to production.
Services
Architecture & cloud platforms
Technical decisions that work in practice. Experience modernising systems, moving services to the cloud and bringing development and operations together.
AWS, Azure, Google Cloud (GCP), Kubernetes, Terraform
Assignments
Behind Trefjorton is over 20 years of development in payments, gaming, telecom and the public sector. Assignments include:
SJ
Current assignment. Backend services on Azure for customer data and payouts.
PayPal / Zettle
Payment flows in PayPal’s point of sale and integrations between Zettle and PayPal.
Kambi
Real-time odds services under very high traffic. Moved services to Kubernetes on AWS.
NetEnt
Led the backend team building event-driven gamification services on Google Cloud.
Com Hem
Order handling for telephony and logistics. Integrated Boxer’s customer systems after the acquisition.
Arbetsförmedlingen
Architect and developer on systems for labour market training and external suppliers.
Own products
Bussradar
Finds the nearest stop, lists departures and shows the buses on the map as they approach. Primarily intended for use on your phone while on the go. Built for SL’s buses in Stockholm, with real-time data from SL and Trafiklab.
Spring Boot, React, Cloud Run, Cloudflare
bussradar.sePrisapan
Invite-only pilot
Prisapan keeps watch on the price of what you’ve bought. If it drops while the return window is still open, you’ll know in time to ask the store for the difference.
Spring Boot, React, Cloud Run, Cloud SQL
Feel free to get in touch.
About future assignments, collaboration or to talk backend and cloud.