sheet 01, the hague52.0799° N / 4.3113° E

We build software and stay to run it.

Asset Flux is a software practice in The Hague. We design, build and operate AI integrations, custom platforms and the servers under them, for companies that want senior engineers without hiring a department. We run six public systems of our own the same way.

coverage
EU, Caribbean, US
engagement
Retainer or project
since
2019

local time where we work

The Hague
Oranjestad
New York

systems we build and run

Our own software, in production.

We wrote these, we host them and we fix them when they break. Client projects get the same engineers, the same deploy recipes and the same monitoring.

production / 7 systems6 of 6 public addresses answering, checked 08:29 UTC
  • up, 75 msRental operations platformOperations software for car-rental companies: fleet, bookings, contracts and payments.platformNext.js, Postgres
  • up, 7 msRental marketplaceCar-rental broker with a network of sourced destination guides.marketplaceNext.js, Postgres
  • up, 23 msTravel stays guideStays companion for travelers who rent a car: where to sleep, matched to the trip.travelNext.js, Postgres
  • up, 67 msVehicle data referenceVehicle data site with VIN decoders and paint code and OBD references.dataPython
  • up, 109 msInspection evidence systemVehicle condition and evidence system for photo inspections at pickup and return.evidenceNode.js, Postgres
  • up, 30 msFile-processing toolkitTools for images, PDFs, video and documents, one file or a whole folder.toolsPython
  • on siteRental deskA live car-rental operation in the Caribbean that runs its counter, fleet and paperwork on our software.operationsprivate network

Status comes from a request this server sends to each system, refreshed every five minutes. The rental desk runs on a private network and has no public address.

what clients hire us for

Four kinds of work, one team.

The engineer who designs your system also ships it, hosts it and answers its alerts.

AI integration

We put language models to work inside the products and processes you already rely on. Claude, GPT and open models, with retrieval and evaluation planned from the first week.

  • Support and triage agents
  • Document reading and retrieval pipelines
  • Multi-step agents that use your tools
  • Evaluation suites and prompt regression tests

in our systemsOur rental platform reads driver’s licenses at the counter. Our inspection system drafts damage reports from photos.

Custom development

Backend services, internal tools and customer-facing platforms. Python and TypeScript on a current web stack, finished where we start them.

  • Operator dashboards and admin tools
  • REST and webhook APIs
  • Scheduled sync between the SaaS tools you pay for
  • Migrations and one-off integrations

in our systemsOur platforms run on Next.js and Postgres. Our data and file tools run on Python.

Managed infrastructure

Hosting, deploys, monitoring and backups. We bill engineering time and pass cloud costs through at the provider’s rate, on Hetzner, OVHcloud, Netcup and PythonAnywhere.

  • Provisioning and hardening on EU providers
  • Deploy pipelines with tested rollback
  • Uptime monitoring and alerting
  • Database backups with restore drills

in our systemsThe systems on this page run on servers we provision, patch and watch ourselves.

Support and retainers

Monthly agreements for availability, maintenance and steady improvement. The engineers who built your system stay on it, so nobody has to relearn how it works.

  • Agreed response windows for production issues
  • Quarterly roadmap and architecture reviews
  • Dependency updates before they turn urgent
  • Senior on-call cover for incidents

in our systemsThe Caribbean rental desk opens every morning on software we maintain.

how an engagement runs

Written scope first. Working software every week.

  1. 01

    Scope

    A short paid conversation about the problem, the constraints around it and what a good result looks like.

    you getA problem statement both sides agree on

  2. 02

    Proposal

    Timeline, deliverables and price, in writing. Fixed scope by project, or monthly by retainer.

    you getA written quote before any work starts

  3. 03

    Build

    Working software every week. You talk to the engineer doing the work, with nobody in between.

    you getA weekly release you can click through

  4. 04

    Run

    We host it, watch it and keep improving it. The same engineer stays on, with the same context.

    you getOne contact for every later change

Retainers run month to month with thirty days’ notice. Fixed-scope projects get a written quote before any work begins. We ask for no commitment beyond the work in front of us.

who we work with

Operators who need senior engineers, without a department.

Our clients are small and mid-sized companies: rental operators, tour businesses, SaaS teams, agencies adding AI to what they sell, and bookkeeping and admin firms. Engagements range from a single integration to a multi-year retainer.

The practice stays small on purpose. We take on work we expect to support for years, and we work asynchronously with overlapping hours for clients in the EU, the Caribbean and the US.

contact

Tell us what you want built, or what keeps breaking.

A few lines about the problem and your timeline are enough. You get a written reply within one business day.

hello@assetflux.nl
The Hague, Netherlands
The Hague
Oranjestad
New York