--- title: "Custom software and web apps, built for you | KL" description: "Custom software and web apps: SaaS, internal system or AI automation. Design, development, cloud, operations and handover. The first version in weeks." canonical_url: "https://preview.kevinludwig.com/en/leistungen/umsetzung" --- [Services](https://preview.kevinludwig.com/en/leistungen) Product Build # Turn the idea into something people use every day. You want something that runs day to day: a product for your customers, a SaaS or an internal system your team works with. We build it for real use: design, development, cloud, operations and handover to your team. All from one team, with one contact. [Book a first call](https://preview.kevinludwig.com/en/kontakt#termin) [Or write to us, one sentence is enough.](https://preview.kevinludwig.com/en/kontakt?anliegen=product#anliegen) - For whom For teams that want something in real use, whether for customers or in-house. - Duration Weeks, not quarters - Outcome Running system, design, cloud setup, documentation, handover A product build is worth it when the system is used daily by your customers or your team and there's no off-the-shelf tool that fits. ![Better Tomorrow GmbH](https://preview.kevinludwig.com/_next/static/immutable/media/bettertomorrow.3gkah4mhsohd6.png) > “Most technology experts understand too little about business, and vice versa. Kevin can do both. For our clients and projects, that means better solutions in less time.” Timo Urbanietz Managing Director, Better Tomorrow GmbH Partner on client projects. Client since 2023 ## Proven in these projects - 6 apps out, plus the translation subscription. The monthly licence cost is gone [LOULEX: six apps out, seven languages in our own hands](https://preview.kevinludwig.com/en/referenzen/loulex-shopify-uebersetzungspipeline) - 5 days from start of build to live [whyraw: a headless Shopify storefront that feels like the camera](https://preview.kevinludwig.com/en/referenzen/whyraw-headless-shopify-storefront) ## Everything that runs in a browser and lives in the cloud. Web, cloud and AI are one discipline for us. So there's no handoff between "the designer", "the backend team" and "the AI people". - ### Web apps, SaaS and internal systems Next.js, Node, Postgres, auth, billing, multi-tenancy. For your customers or for your own team, from the first user to day-to-day operation. If you need an app for iOS and Android, we build it with React Native from the same codebase. - ### Shops and e-commerce Fast shops with fewer add-ons: we replace expensive extra tools with features in the shop itself, clear out unnecessary scripts and make load times and upkeep simple again. When the frontend is part of the brand, we build it separately. - ### AI automation and agents Document pipelines, analysis, assistants and agents, connected to ERP, CRM and accounting. We pick the model and platform to fit the job. Where it matters, a person checks the result. - ### Design Included, not an add-on. Visual identity, UI, interaction. What works well should look good too. Video and photos for your new website? For that we work with [Stefan Fakner (Schteven Visuals)](https://stvnvis.com/?utm_source=kevinludwig.com\&utm_medium=referral\&utm_campaign=partner). ## An early first version, then better step by step. 1. 1 ### Scope From the pilot or the call: what the first version must do, and what it deliberately won't do yet. 2. 2 ### First version Online and usable, usually after a few days. From then on you get real feedback instead of opinions. 3. 3 ### Keep building An update every week. You see every version live, not as a screenshot. 4. 4 ### Handover Documentation, monitoring, access and a runbook. Your team takes over, or we stay on as Fractional CTO. ## Three things we don't negotiate. - ### Live early No big bang at the end. The first version goes live early, and after that we improve a running system. - ### Boring where it counts Proven technology, no experiments on load-bearing walls. Bold only where it makes the difference. - ### Everything with you You get code, infrastructure, access and documentation. ## What you can rely on. - ### Fixed amount Before the start you get a fixed amount for the scope agreed in writing. We only charge more if you commission additional work. Third-party costs, such as hosting or AI, are listed separately in the offer. - ### Go-live commitment We only go live after your acceptance. If something that worked at acceptance fails in the 30 days after, we fix it at no cost, unless someone else changed code, extensions or settings, or a provider outside our control is the cause. For businesses only. The written offer sets out the details, and your statutory rights remain in place. 30 minutes, and you know whether it fits your workflow. [Book a first call](https://preview.kevinludwig.com/en/kontakt#termin) ## After go-live: operations and development. If you like, we stay on after handover with a fixed monthly scope. Or your team takes over with our documentation. - Updates and security fixes - Monitoring and fixing incidents - Small improvements from daily use - One contact who knows the system ## Common questions How is it billed? Flat fee, not by the hour. Before the start you get a written offer with scope and a fixed amount. How much it is depends on the scope and is clear after the first call. Is custom software worth it at all? Not always. Where standard software is enough, we say so. How to tell that your company has outgrown standard tools is in our article. [Why custom software?](https://preview.kevinludwig.com/en/blog/why-custom-software) Do we need a pilot first? Not necessarily. If the requirements are clear, we start right away. If not, a 10-day pilot gets you clarity faster. How long does a product build take? Weeks, not quarters. A shop or a focused web app is often live within four to eight weeks. Larger products we plan in several releases. Who runs the system afterwards? Your team, with our documentation and a handover session. If you like, we stay on for operations or as Fractional CTO. Do you work with our existing team? Yes, together rather than side by side: shared pull requests, reviews and roadmap. ## More on specific topics - ### [Shopify](https://preview.kevinludwig.com/en/leistungen/shopify-development) Shopify stores that load fast and don't depend on a pile of apps. - ### [AI consulting, Stuttgart region](https://preview.kevinludwig.com/en/leistungen/ai-consulting-stuttgart) AI consulting in Stuttgart, Reutlingen and Tübingen. With software, not slides. ## What should be up and running? In 30 minutes on video we work out what should be built and give a first assessment of scope and timeframe. > “You can simply rely on him.” Judith Hickel, Gloria Kollektiv e.V. 5.0 from 8 Google reviews As of October 6, 2026. We don't verify whether reviews come from clients. [Book a first call](https://preview.kevinludwig.com/en/kontakt#termin) [Or write to us, one sentence is enough.](https://preview.kevinludwig.com/en/kontakt?anliegen=product#anliegen) On working days we usually reply within 24 hours.