Now booking projects for 2027
Web apps, mobile apps, integrations and internal tools – built with AI-accelerated workflows, owned end to end by a senior developer, and run on high-availability infrastructure if you need it. What used to eat six-figure budgets, I now typically deliver for €3,000 to €30,000.
$ git push origin main
→ Pipeline #482 started
Lint & typecheck4s
Tests (214 passed)18s
Docker image built31s
Deploy → Kubernetes (3/3 pods)22s
Live at portal.client.com
Shop ↔ DATEV in sync
2 sec ago
Uptime, last 30 days
99.98%
App Store & Google Play
Version 2.4 released
Next.js, React, Nuxt, Vue.js, React Native, TypeScript, Node.js, NestJS, PostgreSQL, Supabase, Redis, Kubernetes, Docker, GitLab CI/CD, Cloudflare, bunny.net, Tailwind CSS, Stripe, Claude, Expo
01Software in the age of AI
AI has fundamentally changed how software gets built. It handles the grunt work – and experience decides whether the result is solid software or an expensive experiment.
Then · traditional agency
Project management, concept, design, frontend, backend, DevOps, QA – and endless meetings in between.
Now · with me & an AI workflow
One point of contact who owns concept, code and operations – powered by AI.
* Ballpark figures for typical small and mid-sized projects. Large platforms like CaterSmart sit above this range.
AI writes boilerplate, tests and documentation. I define architecture, data model and business logic myself – backed by automated tests, strict typing and CI/CD.
No project manager in between, no agency chain. You talk to the person who writes and runs your code.
CI/CD, automated tests, monitoring and backups come standard – the same standards I use for my own SaaS products.
02Services
Lean MVP or highly scalable platform: I build software that fits your processes – not the other way around.
Customer portals, ordering systems, booking platforms, back-office tools – tailored to how you actually work instead of off-the-shelf software full of compromises.
One codebase, two stores: apps built with React Native and Expo – including push notifications, offline mode and publishing to the App Store and Google Play.
ERP, SAP, DATEV, shop, CRM, payment providers: I connect your systems so data flows instead of being retyped.
Internal tools, workflows and replacing that one Excel sheet everything depends on. No more copy & paste between five different programs.
Extract data from documents, triage incoming requests, build assistants with access to your data – AI where it actually saves time. Including MCP servers for Claude & co.
Got an idea? In one to three weeks you have a real, usable product to win over customers, your team or investors.
Kubernetes, GitLab CI/CD, Docker, monitoring, backups: I don't just build the software – I build the foundation it runs on reliably.
03Integrations
REST, GraphQL, SOAP, webhooks, CSV exports or straight into the legacy system's database – if it has data, I can connect it. Shop, ERP, accounting, CRM, payments and AI: I make your systems talk to each other.
For example
04My own products
CaterSmart and TickySmart are my own SaaS products – built, operated and used by real businesses every day. That hands-on experience in development, scaling and support goes into every client project.
CaterSmart
Catering software
The all-in-one solution for caterers and party services: from inquiry to quote, production and invoice – with an AI copilot.
TickySmart
Ticketing software
Online ticketing with your own ticket shop: the money goes straight to the organizer's account, entry runs on a smartphone.
05Infrastructure
Not every project needs a cluster. I recommend what fits your load, budget and risk – and scale with you as you grow.
01 · Solid
A well-secured server with Docker and Coolify, automated deployments and daily backups.
Best for: MVPs, internal tools, projects up to ~1,000 users
Running costs approx. €5–40 / month
02 · Fail-safe
Multiple app servers behind a load balancer, a replicated database and automatic failover.
Best for: Business-critical software, shops, customer portals
Running costs approx. €50–150 / month
03 · Scalable
Container orchestration with autoscaling, zero-downtime deployments and full observability.
Best for: SaaS platforms, high load, spiky traffic
Running costs approx. €80–250 / month
06Privacy & data sovereignty
GDPR compliance isn't an add-on for me, it's the default. And if you need it even stricter: open source, European providers only, on-premise on your own servers – all the way to AI models that run entirely in-house.
Open-source building blocks, including
Retention periods and deletion policies, data access and export, consent, encryption and role-based permissions – planned from day one instead of bolted on later.
Hosting, email delivery, payments, AI: on request, only providers headquartered and hosted in the EU – including data processing agreements.
Proven open-source building blocks like PostgreSQL, Keycloak or MinIO: no license fees, no dependency on US tech giants, everything self-hostable.
Your software runs wherever you want: managed by me in Germany, in your cloud account or on your own servers – even fully offline if needed.
AI without data leaving the building: open-source models like Llama, Mistral or Qwen run on your servers. Documents, emails and customer data never leave the house.
Technical and organisational measures, records of processing activities, deletion policy: I deliver the paperwork your data protection officer wants to see.
07Tech stack
Anything that runs in the browser, on the server or on a smartphone. I pick tools for the project – not for the hype.
Julian Lang
Co-founder & CTO · CaterSmart & TickySmart
$ whoami
→ Full-stack developer & CTO
→ Bayreuth, Upper Franconia
→ Software for mid-sized businesses
→ Full-stack since 2014
08About me
Hi, I'm Julian – full-stack developer and co-founder & CTO of CaterSmart and TickySmart. I've been building software for more than ten years: frontend, backend, APIs, apps and the infrastructure underneath. AI makes me fast – but it takes experience to build software that still runs five years from now.
since 2024
CaterSmart · TickySmart
Responsible for architecture, development and operations of two SaaS platforms: CaterSmart, used daily by more than 160 catering businesses, and TickySmart, online ticketing for event organisers.
since 2014
Julian Lang
More than 100 projects for companies, agencies and public institutions – from portals and integrations to mobile apps and automations.
since 2020
Docrelations GmbH · Pageworkers
Long-standing development partnerships with agencies in Bayreuth and beyond – web solutions, portals and integrations for their clients.
2008 – 2015
PUMA Group · PROFI Engineering Systems · and others
Where it all started: SAP projects and IT operations at large corporations – where I learned how big companies really use software.
Projects for clients including
09Process
Transparent, predictable, no surprises. Every week you see what's been built.
A free 30-minute video call: we talk about your project, your workflows and your budget.
You get a clear concept with scope, timeline and a binding quote.
Weekly demos on a staging environment. You give feedback, I build – no waiting for months.
Deployment, monitoring and backups included. After launch I keep looking after your software – as much or as little as you need.
10Calculator
Click your project together and get a realistic price range instantly. No strings attached – the final quote comes after a short call.
Step 1 of 7
11Get in touch
A few clicks, a few sentences – I'll get back to you within 24 hours (on business days) with a first assessment.
12FAQ
Most projects land between €3,000 and €30,000 – depending on scope, integrations and operational requirements. The calculator gives you a realistic price range in two minutes. Large platforms get a custom quote.
AI now handles a large share of the routine work: boilerplate, tests, documentation, translations. Add proven building blocks from my own products and zero overhead from project management chains. You pay for results, not for meetings.
Without guardrails, yes – which is why I work with clear guardrails. I define the architecture and data model myself, personally check critical areas like payments, permissions and data protection, and automated tests, strict typing and CI/CD keep bugs from going live. AI is my tool, not my replacement.
You do. When the project is done, you get full usage rights and the complete source code in your own Git repository. No lock-in.
By default on servers in Germany – GDPR-compliant and with a data processing agreement. Alternatively, I deploy to your cloud or on-premise on your own servers, including locally hosted AI models if you like.
Yes. If you like, I take care of hosting, updates, monitoring, backups and further development – from basic maintenance to running a Kubernetes cluster.
Yes. I start with a code and infrastructure audit so we know what we're building on. Then we decide together: extend, modernize or replace step by step.
Absolutely – white-label too. I've partnered with agencies for years, handling development, integrations or infrastructure for their clients.
Remote, structured and transparent: video calls, weekly demos, a shared board. For workshops in the Bayreuth, Nuremberg and Upper Franconia area, I'm happy to come by in person.