Arnau Lafuente's portfolio: freelance developer specialised in games, simulators and prototypes. Seven years building automotive simulators with Unity, Unreal and CAN bus.https://arlaf.dev/en-UShttps://arlaf.dev/en/blog/ui-web-local/https://arlaf.dev/en/blog/ui-web-local/A physical knob would be optimal. Building one, not. I put the UI in the browser and made it reachable from any device on the LAN.Mon, 25 May 2026 00:00:00 GMTlumwarefrontendfastapireactwebsockethttps://arlaf.dev/en/blog/el-viatge-es-fa-blog/https://arlaf.dev/en/blog/el-viatge-es-fa-blog/The blog used to be flat text you read once and forgot. The recall mode turns it into the trip's artifact: editable blocks, your own photos, and a PDF you can take with you.Fri, 29 May 2026 00:00:00 GMTcamperrouteblogeditormediapdfhttps://arlaf.dev/en/blog/identitat-spectrum/https://arlaf.dev/en/blog/identitat-spectrum/The name took longer to surface than the architecture. When it did, everything fell into place — even the brand colors.Mon, 25 May 2026 00:00:00 GMTlumwaremarcaidentitatcolorstipografiahttps://arlaf.dev/en/blog/observar-sense-veure/https://arlaf.dev/en/blog/observar-sense-veure/I need to know what broke. I don't need to know whose screen broke. That distinction defines the entire observability layer.Wed, 27 May 2026 00:00:00 GMTcamperrouteobservabilitysentryprivacyhttps://arlaf.dev/en/blog/bmad-i-branches/https://arlaf.dev/en/blog/bmad-i-branches/If I just write code, I lose the thread by week three. If I over-plan, I lose it sooner. I had to learn to plan without drowning in planning.Mon, 25 May 2026 00:00:00 GMTlumwareprocésbmadgitbrancheshttps://arlaf.dev/en/blog/tres-repos-una-promesa/https://arlaf.dev/en/blog/tres-repos-una-promesa/Three modes in the product; three repos in the code. Not a coincidence. The same instinct applied twice: separate the things that move at different speeds.Wed, 27 May 2026 00:00:00 GMTcamperroutearchitecturereposbmadhttps://arlaf.dev/en/blog/arquitectura-python/https://arlaf.dev/en/blog/arquitectura-python/Three decisions changed how I think about this host. None is dramatic on its own. Together, they make all the difference.Mon, 25 May 2026 00:00:00 GMTlumwarepythonarquitecturaeventbusschedulerhttps://arlaf.dev/en/blog/combustible-i-realitat/https://arlaf.dev/en/blog/combustible-i-realitat/A pretty map isn't a product. A map that saves you twelve euros by filling up 4 km further down is. The trick lives in the combination prices + corridor + camper.Wed, 27 May 2026 00:00:00 GMTcamperroutefueldatamitecoosmhttps://arlaf.dev/en/blog/protocol-binari/https://arlaf.dev/en/blog/protocol-binari/The easy option was JSON. It was also the option that made 30 FPS physically impossible. A six-byte-overhead binary protocol clears the bottleneck.Mon, 25 May 2026 00:00:00 GMTlumwareprotocolhostfirmwareperformancehttps://arlaf.dev/en/blog/geofence-i-presencia/https://arlaf.dev/en/blog/geofence-i-presencia/A check-in is the silliest piece of friction in software. Always-on GPS is surveillance. In between lives the geofence with a dwell window.Wed, 27 May 2026 00:00:00 GMTcamperroutegeofencepwaprivacyhttps://arlaf.dev/en/blog/firmware-arduino/https://arlaf.dev/en/blog/firmware-arduino/An Arduino Uno has 2 KB of RAM. A 300-LED strip is 900 bytes just for pixel buffers. Every decision is a question of space.Mon, 25 May 2026 00:00:00 GMTlumwarefirmwarearduinoneopixelstate-machinehttps://arlaf.dev/en/blog/pois-que-apareixen-sols/https://arlaf.dev/en/blog/pois-que-apareixen-sols/An empty planner is intimidating. A planner that already populates the corridor — with everything you don't like removable — is a conversation.Wed, 27 May 2026 00:00:00 GMTcamperrouteaillmpoidiscoveryhttps://arlaf.dev/en/blog/planificar-vs-conduir/https://arlaf.dev/en/blog/planificar-vs-conduir/A dense screen that works at home with coffee is unreadable in the cab with the sun overhead. The temptation was a toggle. The temptation was wrong.Wed, 27 May 2026 00:00:00 GMTcamperrouteuiuxstate-machinehttps://arlaf.dev/en/blog/de-script-a-producte/https://arlaf.dev/en/blog/de-script-a-producte/There was a 200-line script. It worked. The story did not end there — without the next step, there would be no family.Mon, 25 May 2026 00:00:00 GMTlumwareprocésrefactorbrandhttps://arlaf.dev/en/blog/que-es-camperroute/https://arlaf.dev/en/blog/que-es-camperroute/I set out to organise a camper trip. I ended up designing a product with three modes. This post explains why three were necessary.Wed, 27 May 2026 00:00:00 GMTcamperrouteintroproductuxhttps://arlaf.dev/en/blog/que-es-lumware/https://arlaf.dev/en/blog/que-es-lumware/I set out to blink a few LEDs. I ended up designing a software family for programmable light strips.Mon, 25 May 2026 00:00:00 GMTlumwareintrohardwaresoftwarebrandhttps://arlaf.dev/en/blog/hola/https://arlaf.dev/en/blog/hola/What you'll find here: short notes on in-progress projects, electronics and what I'm learning as a freelancer.Fri, 01 May 2026 00:00:00 GMTmeta