Case Studies — What We've Built

Autobutler · 2022-2024

How we cut infrastructure costs by 64% without touching the roadmap

Autobutler was spending 3M DKK annually on infrastructure. They had 11 engineers but velocity was slowing down. The founders knew something was wrong but couldn't pinpoint it.

Marcus joined as Tech Lead in 2022. First week: we profiled the entire AWS setup. The infrastructure was massively over-provisioned for the actual traffic. Database queries were a mess, zero caching strategy, and indexes on columns that were never queried.

Over six months, we:

Consolidated infrastructure through vertical scaling and proper load balancing
Implemented multi-level caching strategies with Redis
Fixed database query optimization issues
Rebuilt their deployment pipeline with modern containerization
Set up comprehensive monitoring and error tracking

The team was also over-staffed. We went from 11 engineers to 4 through natural attrition, but velocity actually improved because we cut all the coordination overhead. Smaller team, better code reviews, faster shipping.

Final tally: 2M+ DKK saved annually (infrastructure + team costs). Response times improved significantly. Deployment went from 45 minutes to 8 minutes. And the founders could finally sleep through the night without Slack pings about server crashes.

2M+

DKK Saved Annually

64%

Cost Reduction

11→4

Engineers

Ruby on Rails React AWS EC2/ECS Redis

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UNOIT · 2015-2019

Building a national education platform for 2M+ Danish citizens

From concept to acquisition: how we architected an education platform that served every Danish citizen and scaled to millions of users without breaking.

The Challenge

UNOIT needed to track educational outcomes for every Danish citizen from kindergarten through university. The scale was intimidating—2M+ active users, millions of data points, and zero tolerance for downtime (schools depend on this daily).

The Approach

We built the entire platform from scratch: Rails monolith with careful domain modeling (schools, students, courses, assessments), PostgreSQL with proper partitioning for the historical data, and a frontend that teachers could actually use. The architecture had to be bulletproof because once schools adopted it, they couldn't switch back.

→ Single Rails monolith (no microservices), carefully organized into domain contexts

→ PostgreSQL with table partitioning for historical assessment data

→ Background job processing with Sidekiq for data imports and report generation

→ Heroku for hosting (simple, reliable, scales automatically)

→ Comprehensive test coverage (95%+) because bugs in education data are unacceptable

The Outcome

The platform launched in 2015 and served Danish schools for years. In 2019, it was acquired by EG (a major Danish software company) for a significant sum. The architecture we built held up perfectly at scale—2M+ users on a single Rails app.

2M+

Active users

99.9%

Uptime

✓

Acquired by EG

Ruby on Rails PostgreSQL Heroku Sidekiq

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Nordic Energy Partners · 2024-Present

Building a trading platform for ship fuel and energy products

Status

In Development

Industry

Marine Trading

Nordic Energy Partners trades marine fuel, lubricants, and energy products for ships across Nordic ports. Their business runs on relationships and real-time pricing, but they were managing everything through spreadsheets, email threads, and phone calls.

We're building a custom trading platform that centralizes their entire workflow: customer inquiries, quote generation with live pricing, order management, delivery coordination with suppliers, and invoicing. The system needs to handle multiple currencies, complex pricing formulas, and regulatory documentation for marine fuel.

Key Features

01

Real-time Pricing Engine

Live pricing for marine fuel, lubricants, and energy products

02

Customer Portal

Self-service ordering and delivery tracking

03

Supplier Coordination

Automated documentation and compliance tracking

04

Multi-Currency Support

Dynamic exchange rates and international payments

Ruby on Rails PostgreSQL Hotwire Trading platform

FaseTech Solar · 2022-2023

Custom CRM and offer solution for solar panel installations

Building a complete sales and installation management system for Denmark's growing residential solar market.

FaseTech Solar installs solar panels for residential and commercial properties. They needed a system to manage the entire sales and installation process—from initial customer inquiries through site assessments, custom pricing based on roof size and panel specifications, installation scheduling, and final invoicing.

"The system replaced their spreadsheet-based workflow and brought their entire operation into one platform."

We built a custom Rails application tailored to their workflow. The system generates detailed offers with ROI calculations, handles installation scheduling with their technician teams, manages inventory for panels and inverters, and tracks project status from quote to completion.

System Capabilities

Custom offer generator with ROI calculations

Site assessment with roof measurements and solar yield estimates

Installation scheduling and crew management

Inventory tracking for panels and installation materials

Automated invoicing tied to milestones

Coverage

Full Project

End-to-end tracking

Automation

Auto ROI

Calculations for customers

Scheduling

Crew Mgmt

Installation coordination

Ruby on Rails PostgreSQL Hotwire CRM

Products · 2018-Present

More products we've worked on

From SaaS platforms to niche marketplaces. All Rails, all profitable, all still running.

Akia.io

Competitor email intelligence for SaaS companies. Monitors your competitors' email campaigns and gives you insights into their marketing strategy.

Rails • IMAP • Stripe

Førsehelt.dk

Platform for finding first aid courses in Denmark. Aggregates courses from different providers, lets users compare prices and locations, and handles bookings.

Rails • PostgreSQL • Booking system

SammenlignKøreskoler.dk

Price comparison for driving schools in Denmark. Aggregates pricing data, lets users compare schools by location and price. Generates lead revenue from driving schools.

Rails • Web scraping • PostgreSQL

RobinsonlistenAPI.dk

GDPR compliance API for Danish companies. Checks if email addresses are on the Robinson List (Danish do-not-contact registry). Simple API, recurring revenue.

Rails API • Redis • GDPR

Other notable projects

A few more things we've shipped over the years.

ProCollective

Freelance management platform for Publicis Groupe. Handled onboarding, contracts, payments, and project management for their global freelance network. Co-founded, built, later exited.

Rails • Stripe Connect

MIX IT ApS

Mobile ordering + POS system for restaurants. Browser-based POS (Rails + AngularJS), mobile app (Ionic), real-time order sync via WebSockets. Learned a lot about offline-first architecture.

Rails • Ionic • WebSockets

What we've built