Freelance Senior software architect
Performance That Scales. Architecture That Lasts.
I modernize legacy software, eliminate performance bottlenecks and design systems built for security, scalability, and long-term maintainability, fully ready for the cloud.
- 14 years of experience
- Azure Solutions Architect Expert
- Performance Optimization Expert
- Scalable, maintainable & clean architectures
Profile
Architecture leadership with expertise in many fields.
You gain a software architect with deep hands-on experience from well before the AI era. With more than 10 years of pre-AI software engineering practice, I understand the pitfalls, tradeoffs, and quality risks of AI-assisted development and use it deliberately as a force multiplier, not a substitute for engineering judgment. Over 14 years, I have delivered and led work across cloud platforms, complex enterprise systems, product engineering, and modernization programs where performance, reliability, security, and maintainability matter.
Tobias Streng, M.Sc. TUM
Senior Software Architect, Azure Cloud Solutions Expert, Performance Optimization Specialist
- Performance optimization across backend, database, frontend, and multi-service environments
- Expert in Cloud Native Architecture
- Event-driven architecture for scalable, resilient platforms
- Architecture reviews, modernization roadmaps, and hands-on delivery leadership
Certifications
Core skills
Broad Full-Stack Knowlege accross many domains.
I know exactly what technology best suits your usecase and can deliver them in no time.
System design, backend engineering, and data
Infrastructure, delivery, and operational systems
Frontend and full-stack application development
High-performance, scalable, and cost-efficient systems
★ Expert Level Knowledge
Recommendations
Trusted in business-critical environments.
Delivery quality shows up in outcomes, communication, and the confidence of the people you work with.
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“Tobias was able to quickly understand a difficult and complex legacy environment and turn it into a much more performant and resilient technical foundation that meets modern coding standards. His work improved performance substantially, with gains of up to 30x compared to before, reduced inefficiencies in the hosting setup, and established a more sustainable engineering approach. He introduced future-proof system designs that strengthened reliability and scalability. Tobias consistently solved problems that had previously been unsolvable for us, demonstrating strong analytical thinking and deep technical expertise while delivering impactful and lasting improvements across the system.”
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“Tobias has extensive experience in software development, both in C# and Java, and can effectively transfer his knowledge across contexts. He designed robust architectures for cloud-based (AWS) backend systems using Java & Quarkus, as well as decentralized client applications in C#. He supported and enabled junior team members to navigate complex environments and contribute productively. As a PO / Requirements Engineer, he was a valuable sparring partner in architectural work. His own development performance and speed were outstanding.”
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“Mr. Streng impressed with exceptional technical expertise, strategic thinking, and strong problem-solving skills. His more than ten years of experience were evident in all project phases, mastering complex challenges efficiently while setting high standards in quality and sustainability. Through a structured approach and high quality standards, he significantly improved team performance. He introduced coding guidelines, modern architectures, and implemented high-quality CI/CD pipelines. His expertise in cloud architectures ensured scalability, cost-efficiency, and security. He also stood out through teamwork, communication skills, and knowledge sharing.”
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“Tobias designed and implemented a robust monitoring solution for our internally developed heavy machinery used on construction sites worldwide. His solution has proven to be highly reliable, sustainable, and consistently dependable in demanding environments. It significantly improved system transparency and operational stability over the long term. Tobias demonstrated outstanding development expertise, a strong sense for practical and maintainable solutions, and delivered results with high efficiency and precision. I would highly recommend Tobias for his professional excellence, technical capabilities, and consistently effective performance in complex, real-world applications.”
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“Over more than eight years, Tobias has been an integral part of our team. He designed, developed, and implemented a data management system used by engineering teams worldwide to coordinate and synchronize CAD design tasks. The cloud and on-premises hybrid solution, built on a microservice architecture, has consistently improved engineering efficiency across multiple projects. Tobias stands out for his exceptional analytical skills and high-quality work. He quickly understands complex problems and reliably delivers sophisticated, well-structured solutions. I can highly recommend Tobias for his technical expertise, professionalism, and lasting impact on our engineering processes.”
My Offers
Architecture packages built for decision speed and delivery impact.
Clear outcomes, tight scope, and direct senior involvement.
Fast diagnostic
Free
Performance Bottleneck Analysis
I analyze critical performance bottlenecks and architectural caveats. You will get an initial report with the biggest risks in your system.
Deliverables
- Hotspot analysis across code paths, queries, and runtime architecture
- Initial Performance Bottleneck review
Deep Profiling
Deep Architectural Analysis
I deeply profile where time, compute, and money are being lost across backend services, database access, frontend flow, and infrastructure. Additionally I can identify modernization options.
Deliverables
- Detailed plan of performance caveats and options how to solve them.
- Estimation of performance improvement per option
- Possible modernization options
Architectural refactoring
Refactor Business Critical Modules
I refactor the identified modules to maximize the performance. You will receive a cleaned up application, that is easily maintainable for your team.
Deliverables
- Performance Optimized Modules
- Cleanly Refactored Code
- Developer Documentation with architectural decisions and patterns
External Support
Architecural Guide for your Team
I will be your external Software Architect Consultant. Build up knowledge in your team, review Code Changes and help with Architectural decisions.
Deliverables
- Architectural Decisions
- Code Reviews
- Performance Monitoring
- Team Mentoring
Project history
Selected engagements over time.
A timeline of client work, architecture roles, and long-running delivery ownership.
Freelance
Architecture, modernization, and redevelopment of legacy C# backends, including major backend and database performance improvements, cloud efficiency tuning, CI/CD setup, and AI-assisted delivery workflows.
- Increased backend performance by up to 11x
- Drove low-cost infrastructure and efficiency improvements in cloud-hosted services
- Established delivery workflows that kept AI-assisted output at production quality
Employment
Led architecture work for cloud migrations from on-premises systems, designed microservice systems with Java and Quarkus, and supported CI/CD and modernization work in a larger DevOps setting.
- Led and mentored a DevOps team of 10 developers
- Designed microservice architecture for cloud migration initiatives
- Improved delivery reliability through stronger CI/CD and release automation
Freelance
Built a web application for visual monitoring of industrial machinery, combined with system analysis and extraction of readable insights from machine log data.
- Turned binary machine logs into actionable operational insights
- Delivered a browser-based monitoring experience for complex industrial systems
- Bridged software engineering with automation and machine analysis
Freelance
Delivered a React and Node.js application for land measurement and customer acquisition workflows, with a focus on practical process optimization and targeted lead generation.
- Improved acquisition workflows with map-based data capture
- Connected technical implementation directly to lead generation outcomes
- Reduced manual process friction through targeted automation
Freelance
Founded and built a comparison platform with Angular frontend architecture, scalable Azure backend services, web-optimized image delivery, and highly cost-efficient cloud operations.
- Built the platform end-to-end as founder and architect
- Reduced cloud operating cost to below 0.10 EUR per month
- Implemented a custom image delivery approach for fast web performance
Employment
Cloudified a product data management system with Angular frontend, hybrid Azure and on-premises backend architecture, database modeling, and modern authentication using Microsoft Entra ID and OIDC.
- Led the technical direction of a 3-developer project team
- Modernized the platform with hybrid cloud architecture on Azure
- Introduced stronger identity and access architecture with Entra ID and OIDC
Employment
Redeveloped the PDM platform in C# and .NET with clean architecture principles and implemented supporting Azure infrastructure for enterprise delivery.
- Rebuilt a core enterprise platform on a cleaner architectural foundation
- Introduced Azure infrastructure for long-term platform evolution
- Created maintainable foundations for later cloud and web expansion
Selected projects
From cloud modernization to product delivery.
A mix of public work and representative architecture engagements.
Fairgleich.net
Built and launched a product comparison platform with Angular frontend architecture and a scalable Azure-based backend.
Combined product engineering, cloud architecture, and cost optimization down to extremely lean monthly operating cost.
View project
CertyFox.com
Built and launched an IT Exam Learning Suite, that enables professionals to efficiently prepare for IT exams.
Combined product engineering, cloud architecture, and cost optimization down to extremely lean monthly operating cost.
View project
ZugNow.com
Co-Authored and launched a platform to support Freelancers and KMUs with their E-Invoices and Taxes-Management.
Combined product engineering, cloud architecture, and cost optimization down to extremely lean monthly operating cost.
View project
Lizenzpilot.de
Co-Authored and launched a platform and an Android App to enable individuals to prepare efficiently for various licenses.
Combined product engineering, cloud architecture, and cost optimization down to extremely lean monthly operating cost.
View project
GenetPDM
Architected and evolved a distributed product data management platform with web integration, hybrid cloud setup, and deep engineering workflows.
Enabled long-term platform modernization across web, backend, and enterprise data architecture.
View project
Landacquisition.com
Delivered a lead-generation web application for land acquisition workflows using Google Maps interactions and customer-facing UX.
Improved the client acquisition process by combining targeted input capture with automation-oriented data flow.
View project
Various Open Source Libraries
In my Github profile, you can find multiple well designed open-source .NET Nuget packages, that increase developer productivity!
Packaged architectural ideas into a reusable developer tools with public distribution and documentation value.
View projectBook an appointment
Bring the hardest architecture problem to the first call.
If you need clarity on system design, modernization, cloud strategy, or performance bottlenecks, we can use an initial session to map options and define a next step.
- Useful for architecture reviews, modernization plans, and technical decision support
- Best fit for companies that already feel the cost of architectural complexity
- Direct contact with Tobias Streng from first conversation to implementation
Primary next step
Request an Appointment Send Project DetailsEmail [email protected]
Based in Munich, Germany