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App modernization factory: transition from legacy infrastructure to cloud-native efficiency

We refactor your .NET and Java portfolios into Docker containers and Azure PaaS to eliminate technical debt, reduce operational costs, and unlock auto-scalability.

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The challenge: the limitations of "lift and shift"

Migrating servers to the cloud without modernization often results in higher costs and minimal strategic gain. Organizations relying on simple rehosting face significant hurdles:

High operational overhead

IT teams consume valuable hours on OS patching and maintenance rather than innovation.

Stagnant release velocity

Without automated pipelines, deployment cycles remain slow, manual, and error-prone.

Resource inefficiency

Monolithic virtual machines cannot auto-scale efficiently, leading to payment for idle capacity.

Compounding technical debt

Running legacy applications on outdated operating systems increases security risks and compliance exposure.

The solution: platform as a service (PaaS) adoption

We execute a strategic shift from IaaS (Infrastructure as a Service) to PaaS (Platform as a Service). This model transfers the burden of infrastructure management to Microsoft Azure.

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01

Abstracted OS management

Whether using Azure App Service plans or Kubernetes node pools, the underlying OS patching and security updates are handled automatically by the platform.
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02

Event-driven scalability

We implement auto-scaling rules (Horizontal Pod Autoscaling or KEDA) based on CPU, memory, or HTTP queue length, optimizing spend in real-time.
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03

Immutable infrastructure

We deploy standardized container images, ensuring that development, staging, and production environments are identical, eliminating configuration drift.

How it works: our engineering process

We treat modernization as a rigorous, repeatable engineering process designed to minimize risk and maximize stability.

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01

Containerization (.NET & Java)

We refactor application code to run within Docker containers. This process involves:
  • Dependency decoupling: Removing dependencies on the Global Assembly Cache (GAC) or local file systems.
  • Configuration management: Transforming web.config or appsettings.json to read from Environment Variables or Azure Key Vault.
  • Runtime upgrades: Upgrading legacy frameworks to modern standards (.NET Core / Java 11+) and implementing multi-stage Docker builds for optimized image sizes.

02

Database modernization

We migrate on-premise SQL Server environments to Azure SQL Managed Instance. This ensures high compatibility with existing schemas (including CLR modules and SQL Agent jobs) while providing a fully managed engine. We utilize the Azure Database Migration Service (DMS) to ensure transactional consistency during the move.

03

DevOps automation (CI/CD)

We implement comprehensive CI/CD pipelines using YAML definitions.
  • Continuous integration: Automated unit testing, static code analysis (SonarQube), and image scanning (Trivy) on every commit.
  • Continuous deployment: Blue-green or canary deployment strategies using Helm charts to ensure zero-downtime releases.

Technology stack: enterprise-grade Azure foundation

We utilize robust managed services to ensure stability, security, and reduced operational overhead.

Compute

Azure Kubernetes Service (AKS) for complex microservices orchestration or Azure App Service for standard web applications.

Data

Azure SQL Managed Instance for seamless compatibility and Azure Redis Cache for session state offloading.

Security

Azure Key Vault for secret management and Virtual Network Injection to keep backend traffic off the public internet.

Observability

Azure Monitor and Application Insights for distributed tracing and performance telemetry.
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Business value: the return on modernization

The "Factory" approach delivers measurable ROI by permanently removing operational friction and infrastructure costs.

  • Reduced total cost of ownership (TCO): Elimination of OS licensing, patching, and manual maintenance significantly lowers run rates.
  • Risk mitigation: Modernizing legacy frameworks removes security vulnerabilities associated with end-of-life software.
  • Operational agility: Automated pipelines enable rapid response to market changes and customer feedback.
  • Security & compliance: Managed identities (MSI) replace rotation-heavy credentials, providing a superior security posture.

Deliverables: a future-ready environment

Deliverable

Technical specifications

Containerized workloads

Optimized Dockerfiles and OCI-compliant images stored in a secured Azure Container Registry (ACR).

Infrastructure as code (IaC

The complete environment (AKS, SQL MI, VNETs) defined in Terraform or Bicep state files for repeatability.

Automated pipelines

Reusable YAML pipeline templates for build, test, and release orchestration.

Operational runbooks

Documentation covering monitoring alerts, rollback procedures, and disaster recovery execution.

Professnet is officially certified for: ISO 27001

ISO certifications reflect our focus on delivering reliable and secure technology services.
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Tier-1 Partner

Direct collaboration with Microsoft engineers

16 Years

Experience in system design

ISO 27001

Certified information security

< 15 min

Critical incident response time (SLA)

Engagement timeline: the modernization lifecycle

Week 1

Assessment & pilot selection

We analyze the application portfolio, identifying hard dependencies (e.g., COM objects, third-party drivers) and selecting a representative candidate for the pilot.

Week 2-4

Factory execution

Our engineering team refactors the code, containerizes the application, and performs the database schema migration to Azure SQL MI.

Week 5

Production handover

We deploy the modernized solution to production and transfer knowledge regarding the new GitOps workflows and observability dashboards.

Why partner with us?

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Deep engineering expertise

We do not simply move virtual machines; we read and write code. We possess the software engineering skills required to refactor code effectively.

Database migration specialists

We specialize in complex SQL Server migrations, utilizing Azure SQL Managed Instance to ensure data integrity and minimal downtime.

DevOps culture

We deliver more than a platform; we implement a culture of automation that empowers your internal teams.

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What our customers say about us

Their professionalism, reliability, and commitment to each project ensure that every collaboration runs smoothly and efficiently. I wholeheartedly recommend Professnet as a solid and competent business partner.

Mariusz Duczek

Managing Director @ SCHURTER

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Thanks to their skills in system integration and technological consulting, we have significantly improved our operational processes. Projects are executed not only on time but with the utmost care.

Jarosław Sojewski

Managing Director @ FOMAR Friction

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The professionalism of the team, their quick response to our needs, and in-depth analysis have enabled us to optimize our cloud environment and enhance its security. We confidently recommend Professnet as a solid technology partner.

Maciej Kromkowski

Board Member @ Power21

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Case studies

From Local Server Room to Global Cloud

How abcgo.pl Reduced Costs by 40% and Secured Client Financial Data.

ERP System:

enova365

Technologies:

Microsoft Azure, Azure Virtual Desktop (AVD), SQL Database

Key Achievement:

40% OPEX Reduction
Read more
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hero-m365
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Building a resilient security architecture

How KZBS secured the ecosystem of 500+ cooperative banks against modern threats.

Sector:

Banking / Public Trust

Scale:

500+ Associated Banks

Key Compliance:

NIS2, DORA, GDPR, ISO 27001
Read more

FAQ

Generally, no. Our "Factory" model focuses on strategic refactoring. We modify only the code necessary to ensure container compatibility—such as externalizing state to Redis or moving configuration to Key Vault—without rewriting core business logic.

SQL on a VM requires manual OS and database patching. Azure SQL Managed Instance offers a "vCore" model with automated patching, backups, and built-in high availability, while supporting near 100% of the surface area of on-premise SQL Server (including cross-database queries).

Yes. We can containerize these applications using Windows Containers on AKS. However, we often recommend a targeted upgrade to .NET 6/8 (Core) to leverage Linux containers, which offer a smaller footprint and lower licensing costs.

We utilize the Azure Database Migration Service (DMS) in "Online" mode. This replicates data continuously while the application is running. Downtime is restricted strictly to the final cutover window (updating connection strings), typically lasting only a few minutes.

Technology Partners

cisco
citrix
dell
eset
fortinet
fujitsu
hpe
huawei
jabra
lenovo
manage-engine
microsoft
oracle
palo-alto
redhat
symantec
trend-micro
vmware
xerox
cisco
citrix
dell
eset
fortinet
fujitsu
hpe
huawei
jabra
lenovo
manage-engine
microsoft
oracle
palo-alto
redhat
symantec
trend-micro
vmware
xerox
cisco
citrix
dell
eset
fortinet
fujitsu
hpe
huawei
jabra
lenovo
manage-engine
microsoft
oracle
palo-alto
redhat
symantec
trend-micro
vmware
xerox
cisco
citrix
dell
eset
fortinet
fujitsu
hpe
huawei
jabra
lenovo
manage-engine
microsoft
oracle
palo-alto
redhat
symantec
trend-micro
vmware
xerox
cisco
citrix
dell
eset
fortinet
fujitsu
hpe
huawei
jabra
lenovo
manage-engine
microsoft
oracle
palo-alto
redhat
symantec
trend-micro
vmware
xerox
cisco
citrix
dell
eset
fortinet
fujitsu
hpe
huawei
jabra
lenovo
manage-engine
microsoft
oracle
palo-alto
redhat
symantec
trend-micro
vmware
xerox

We are always happy to talk

Reach out to us about a project, consultation, or to explore other collaboration opportunities.

portrait Lukasz Tabaczek

Lukasz Tabaczek

CEO
professnet@professnet.pl
+48 516 524 227
Schedule a meeting
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Elektronowa 2d (4 floor)
03-219 Warsaw
P O L A N D
VAT ID: PL 5242 793 610

Cloud & Infrastructure:

Migration & Repatriation Azure Landing Zone Secure Connectivity Intune & Device Management

Apps, Data & AI:

App Modernization Factory Serverless & Event-Driven Azure DevOps & IaC Private RAG (GenAI)

Security & Compliance:

Managed SOC Identity & Entra ID DevSecOps (SSDLC) Security Consulting

Managed Services:

Managed Infra (24/7) Co-Managed Azure Managed Compute (VMs) Data Lifecycle & Archive

Assessments:

Azure 3D Assessment NIS2 & DORA Audit AI Readiness Check App Mod. Assessment AKS Health Check

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