Software engineering
Backend services, APIs and domain logic written to be read, tested and maintained by other engineers long after the first release.
IT engineering company · English
Software that
holds up under
real conditions.
House 55 GmbH designs, builds and operates custom software, cloud platforms and secure digital products. We work as an engineering partner: architecture you can review, code you can maintain and systems you can keep running.
02Company overview
An IT company organised around engineering practice.
House 55 GmbH provides information technology services to organisations that depend on software to operate. Our work covers the full life of a system: understanding the problem, designing an architecture, building and testing it, releasing it safely and keeping it healthy afterwards.
We deliberately keep the distance between decision and implementation short. The engineers who design a system are the ones who discuss it with you, which means trade-offs are explained in plain terms and documented as part of the work rather than summarised afterwards.
03Core IT expertise
Six disciplines that carry every engagement.
Cloud architecture
Environments designed around clear boundaries, reproducible infrastructure and predictable deployment paths across staging and production.
Product interfaces
Web and mobile front ends built on accessible components, measurable performance budgets and consistent design systems.
Data engineering
Pipelines, storage models and reporting layers that keep data traceable from its source through to the decisions it supports.
Security engineering
Threat modelling, secure defaults, dependency hygiene and access control reviewed as part of delivery rather than after it.
Platform reliability
Observability, alerting and operational runbooks so that incidents are detected, understood and resolved with a clear process.
04Services overview
Ten services, one delivery method.
Each service is described in detail on the services page.
- 01
Custom Software Development
Systems shaped around a specific operating model.
- 02
Web Application Development
Responsive, accessible applications for browsers.
- 03
Mobile Application Development
Native and cross-platform product work.
- 04
Cloud Solutions
Architecture, migration and cost-aware operation.
- 05
DevOps and Infrastructure
Pipelines, environments and infrastructure as code.
- 06
UI/UX Design
Research, interaction design and design systems.
- 07
Quality Assurance
Test strategy across unit, integration and end-to-end.
- 08
Cybersecurity Consulting
Reviews, hardening and secure delivery practices.
- 09
Data and AI Solutions
Pipelines, analytics and applied machine learning.
- 10
Technical Consulting and Support
Architecture guidance and ongoing product care.
05Technology capabilities
Tools chosen for the problem, not for novelty.
We favour mature, well-documented technology with active maintenance and a hiring pool deep enough that your system remains supportable. New tools are introduced when they solve a real constraint and can be justified in writing.
- Languages
- TypeScript, JavaScript, Python, Go, Java, Kotlin, Swift, SQL
- Frontend
- React, Next.js, Vue, React Native, design systems, WCAG-aligned components
- Backend
- Node.js, FastAPI, Spring, REST, GraphQL, event-driven services
- Data
- PostgreSQL, MySQL, Redis, object storage, warehousing, ETL and streaming
- Cloud
- AWS, Azure, Google Cloud, containers, Kubernetes, serverless runtimes
- Delivery
- Terraform, CI/CD pipelines, automated testing, observability tooling
06Software-development process
A process that stays visible from first call to steady state.
Six repeatable stages. Nothing is hidden behind a phase gate you cannot inspect.
Discovery
We map the problem, the users, the existing systems and the constraints before proposing an approach.
Architecture
Interfaces, data models and integration points are agreed and documented so the plan can be reviewed.
Iterative build
Work is delivered in short cycles with running software at the end of each one.
Verification
Automated tests, code review and manual verification run continuously, not only before release.
Release
Deployment is automated and repeatable, with rollback paths defined before anything ships.
Operate and evolve
Monitoring, maintenance and roadmap work continue after launch for as long as the engagement runs.
07Industries we support
Different sectors, comparable engineering demands.
The vocabulary changes between industries; the requirements for correctness, traceability and uptime do not. We begin every engagement by learning the domain language of the people who will use the system.
- Financial services
- Auditability, precise data handling and strict access control.
- Healthcare and life sciences
- Sensitive data workflows and careful integration with existing systems.
- Logistics and mobility
- Operational tooling, tracking and integration with physical processes.
- Manufacturing and industry
- Machine data collection, dashboards and internal engineering platforms.
- Retail and e-commerce
- Storefronts, catalogue systems and order and fulfilment integrations.
- Public sector and education
- Accessible interfaces and long-lived, documented systems.
- Energy and utilities
- Telemetry, reporting and reliability-focused backend services.
- Professional services
- Internal platforms that replace fragile spreadsheets and manual steps.
08Infrastructure and security approach
Infrastructure described in code, security decided in the open.
Reproducible environments
Infrastructure is defined in version-controlled code so environments can be rebuilt rather than repaired by hand.
Least-privilege access
Accounts, services and pipelines receive only the permissions required for the task they perform.
Secrets and dependencies
Credentials are managed outside the codebase, and dependency updates are monitored for known vulnerabilities.
Observability by default
Logging, metrics and tracing are part of the initial build so that failures can be diagnosed rather than guessed.
Documented recovery
Backup and restore procedures are written down and exercised, not assumed.
09Quality-assurance principles
Quality is a property of the process, not a final inspection.
Tests as documentation
A test suite describes intended behaviour, so future changes fail loudly when the intent is broken.
Shift-left verification
Static analysis, type checks and linting run locally and in CI before review begins.
Review discipline
Every change is read by another engineer, with an emphasis on clarity and risk rather than style.
Release confidence
Staging environments mirror production closely enough for verification to be meaningful.
10Reasons companies work with House 55 GmbH
Four commitments we can be held to.
Engineering-led conversations
The people who design and build the system take part in the discussions about it.
Transparent progress
Working software, issue trackers and code repositories are open to you throughout the engagement.
Maintainability first
We optimise for the cost of the next change, not just the speed of the current one.
No hidden lock-in
Infrastructure, documentation and source code are handed over in a form your own team can operate.
11Frequently asked questions
Questions we are asked most often.
- What kinds of projects does House 55 GmbH take on?
- We work on custom software, web and mobile applications, cloud platforms, data pipelines and security-focused engineering work. Projects range from a single well-defined system to long-running product development alongside an in-house team.
- How do engagements usually start?
- They start with a discovery conversation about the problem, the systems already in place and the outcome you need. From there we propose an architecture and a delivery approach that can be reviewed before any code is written.
- Can you work with an existing codebase?
- Yes. We regularly join projects that are already in production, beginning with a review of the code, infrastructure and test coverage so that changes can be made safely.
- How is quality assured during delivery?
- Automated testing, code review, static analysis and continuous integration run throughout the project rather than as a final phase before release.
- How is security handled?
- Security is part of design and delivery: threat modelling during architecture, least-privilege access, dependency monitoring, secret management and review of authentication and authorisation logic.
- What happens after a system goes live?
- Where an engagement includes it, we continue with monitoring, maintenance, incident response and further development. Documentation and handover material are prepared so your own team can operate the system.
- In which language do you work?
- All documentation, code and communication for this website and its services are provided in English.
- How can the company be reached?
- House 55 GmbH can be reached by email at [email protected].
12Company information
House 55 GmbH
Correspondence in English is handled by email. Details published here are limited to information we can verify.
- Company
- House 55 GmbH
- [email protected]
- Website
- house55group.com
- Working language
- English