Open-source · Available for new work

Custom software, shipped with care and a short feedback loop.

We build and modernize production systems with Django, PostgreSQL and AI-assisted development — on top of the open-source stack we trust: Linux, Postgres, Python, Docker. A small practice focused on reliable delivery, the kind you agree on a price for and get on time.

Start a project → See selected work

Based Støvring, Denmark

Founded 2011

Focus Django · Postgres · AI tooling

Engagement Fixed scope or retainer

01 — Technology

The tools we reach for first, and know deeply.

We work almost exclusively with open source. It's durable, inspectable, portable between providers — and the ecosystem we've invested in for over a decade.

Python

Our default language for building anything from web backends to automation and data pipelines. We write modern, typed Python.

python.org

Django

A batteries-included framework we've deployed to production for over a decade. Admin, auth, ORM, migrations — unbeatable for delivery speed.

djangoproject.com

PostgreSQL

Our database of choice. We design schemas, tune queries, and use the full Postgres toolbox — JSONB, partial indexes, triggers, extensions.

postgresql.org

Docker

Everything we ship is containerized. Reproducible from laptop to production, with sane orchestration and no surprise drift.

docker.com

Hetzner & Digital Ocean

Predictable, affordable European infrastructure. We deploy, provision and operate directly on VPS — no hyperscaler lock-in unless you need it.

hetzner.com

AI agentic coding new

We use Claude Code and similar agentic tools every day — on refactors, migrations, test suites, greenfield work. It makes small teams ship like bigger ones.

claude code

Also comfortable with Redis Celery HTMX Hyperscript Nginx / Caddy GitHub Actions Stripe Linux sysops

02 — Services

Outcomes we deliver, not hours we sell.

/ 01

MVPs & greenfield builds

From concept to a running production system, typically in 6–12 weeks. Django + Postgres as the backbone, opinionated frontend choices, deployed and monitored end-to-end.

Scoping workshop
Domain modelling
First release in weeks

/ 02

Legacy modernization

We take tired Django, Python 2 or under-maintained Postgres systems and bring them forward — with migrations, tests and zero downtime. Often pairs well with a cloud-to-Hetzner move.

Framework & runtime upgrades
Schema refactoring
Dockerize & redeploy

/ 03

AI integration & automation

Practical AI inside existing products: LLM features, internal agents, data enrichment, decision support. We deploy AI-assisted coding workflows across your team so the speedup sticks after we leave.

LLM feature design
Agent & tool workflows
Evals & guardrails

/ 04

Operations & retainers

Long-term operational responsibility for systems we or others have built — upgrades, monitoring, performance, on-call. Linux, Hetzner, Digital Ocean, Docker-first, sensible observability.

SLA-backed ops
Monthly retainer
Incident response

03 — About

A small Danish practice, built to outlast fashion.

We are passionate about technology and deliver solutions that work — on time and to the price agreed.

SDNielsen ApS was founded in 2011. Since then we have shipped systems across fintech, e-commerce, logistics and internal tooling — always with a preference for small, durable codebases and tools that stay out of the way.

Today we combine that craft with modern AI-assisted workflows. It means fewer people, faster iteration, and more time thinking about the actual problem instead of the boilerplate around it.

Founded 201115+ years in production

Stack PyPython · Django · Postgres

Hosting EUHetzner · Digital Ocean

Mode 1:1Direct, senior contact

04 — Selected work