00IT company · Software engineering
Software built to last, not just to launch.
Postulator23 GmbH designs and builds custom software, web applications and cloud systems — with clear architecture, careful testing and support long after release.
01Overview
We are an engineering partner for organisations that need dependable software and want to understand what they are getting.
Our work spans the full lifecycle: understanding the problem, designing a fitting architecture, writing and testing the code, running it in the cloud and keeping it healthy over time. We communicate plainly, document our decisions and leave systems that other engineers can pick up.
02Core areas of expertise
Six disciplines, one coherent practice.
01
Custom software
Applications shaped around your processes rather than the other way round.
02
Web applications
Fast, accessible browser-based tools for customers and teams.
03
Cloud & infrastructure
Reproducible environments, sensible costs and observable systems.
04
Integration & APIs
Connecting the systems you already rely on, reliably.
05
Automation
Removing repetitive manual work from everyday operations.
06
Quality & support
Testing, maintenance and long-term technical care.
03Custom software development
Software that fits the way you actually work.
Off-the-shelf products often force compromises. We build tailored applications for internal operations, data handling and specialised business logic — with a codebase structured for change.
- — Domain modelling with your specialists
- — Clear module boundaries and documentation
- — Incremental delivery you can review
04Web application development
The browser is the platform.
Customer portals, dashboards, booking tools and internal admin systems — built to load quickly, work on any screen and remain accessible to everyone who uses them.
- Responsive by default
- Interfaces designed for phones, tablets and desktops from the first sketch.
- Accessible
- Semantic markup, keyboard support and readable contrast as baseline requirements.
- Performant
- Careful attention to load time, rendering and data transfer.
05Cloud & infrastructure
Infrastructure described as code, operated with intent.
We design cloud environments that can be rebuilt from version control, scaled when demand changes and monitored so problems surface early. Cost awareness is part of the architecture, not an afterthought.
- Infrastructure as code
- Containerisation
- CI/CD pipelines
- Monitoring & logging
06Systems integration & automation
Your systems should talk to each other — without anyone copying data by hand.
We design and build APIs, connect business applications and automate recurring workflows such as data synchronisation, reporting and document processing.
Integrations are built with retries, logging and clear error handling, so that when an external service misbehaves, you know about it and nothing is silently lost.
07Security-focused engineering
Security is a habit in every commit.
Least privilege
Access rights limited to what each component and person needs.
Dependency hygiene
Regular review and updating of third-party libraries.
Secrets management
Credentials kept out of source code and rotated when needed.
Data minimisation
Collecting and storing only what a feature genuinely requires.
08Project delivery process
Four phases, visible progress throughout.
- 1
Discover
Goals, users, constraints and risks are clarified together before design begins.
- 2
Design
Architecture and interface concepts are proposed, discussed and documented.
- 3
Build
Working software is delivered in short increments, each one reviewed with you.
- 4
Release & evolve
A careful launch, followed by monitoring and measured improvement.
09Quality assurance & testing
Confidence comes from evidence, not hope.
Testing is planned alongside development. Automated tests guard core logic, while manual review covers usability and edge cases that machines miss.
| Unit tests | Verify individual functions and business rules |
|---|---|
| Integration tests | Check that components and external services work together |
| End-to-end tests | Exercise real user journeys through the interface |
| Code review | Every change read by a second engineer |
10Maintenance & support
Launch day is the beginning.
Software needs care: security patches, dependency updates, performance tuning and adjustments as your business changes.
We offer ongoing technical support tailored to each system — from regular update cycles to continued feature development.
11Questions
Frequently asked questions
- What kinds of projects does Postulator23 GmbH take on?
- We work on custom business software, web applications, cloud infrastructure, API integrations and workflow automation. Projects range from a focused internal tool to a larger platform developed in several phases.
- Can you work with an existing codebase?
- Yes. Many engagements start with software that already exists. We begin by reading the code, understanding its history and identifying risks before proposing changes.
- How is a project usually structured?
- We start with discovery to clarify goals and constraints, then deliver in short, reviewable increments. You see working software early and can adjust priorities as you learn.
- Which technologies do you use?
- We choose technology based on the problem, your team's skills and long-term maintenance costs — not on trends. We favour well-supported, widely understood tools.
- Do you provide support after launch?
- Yes. We offer ongoing maintenance covering updates, monitoring, bug fixes and gradual improvements, agreed according to what your system actually needs.
- How do we start a conversation?
- Send a short description of your situation to [email protected]. We will reply to discuss whether and how we can help.
12Contact
Tell us what you are working on.
Write to us with a short description of your project or question. Postulator23 GmbH replies by email.