Senior-Tester specializing in Load and Performance Testing

Hello, and thank you for visiting my profile!

I am a freelance Senior-Tester specializing in Load and Performance Testing , with over 12 years of experience designing, executing, and optimizing high-impact performance testing strategies for mission-critical applications.

From global e-commerce systems and mobile banking platforms to complex government portals and internal enterprise solutions—I’ve helped clients across industries achieve scalable, resilient, and high-performing digital systems.

When your application must perform under pressure, you need someone who doesn't just run scripts but understands architecture, interprets infrastructure metrics, and speaks the language of both business and technology. That's where I come in.

✅ My Expertise at a Glance

📊 Performance Testing Strategy & Execution
⚙️ Tool-Agnostic Load Testing Design
🔎 Bottleneck Detection & Root Cause Analysis
🌐 Cloud-Native Performance Validation
📈 Production Readiness & Go-Live Assurance
🔐 Security, Load & Stability Testing for Regulated Industries
Whether your system needs to handle 100 or 1 million concurrent users, my job is to ensure your SLAs, KPIs, and user expectations are met—or exceeded.

🔧 Services Offered

1. Test Strategy & Planning
Requirement gathering (NFRs – Non-Functional Requirements)
Workload modeling and test data strategy
Environment validation for test readiness
Defining SLA metrics: response time, throughput, error rates, scalability

2. Test Implementation

Script development using:
Apache JMeter
LoadRunner / Performance Center
NeoLoad
Gatling
Locust
Support for Web (HTTP/S), REST, SOAP, WebSockets, GraphQL, Citrix, and custom protocols

3. Test Execution

Load tests (baseline, load, spike, endurance, stress)

Real-time monitoring during execution

Integration with CI/CD pipelines (Jenkins, GitLab CI, Azure DevOps)

4. Performance Monitoring & Diagnostics

Use of APM tools like:

Dynatrace

AppDynamics

New Relic

Grafana/Prometheus

Collaboration with developers and infrastructure teams to identify:

Thread/contention issues

Slow DB queries

Network latency or load balancer misconfigurations

Inefficient code or memory leaks

5. Reporting & Recommendations

Root cause documentation with logs, metrics, and visualizations

Tuning recommendations (code, DB, infrastructure)

Executive summaries for C-level stakeholders

Support in post-go-live performance regression

🛠️ Tools & Technology Stack

I work in both open-source and enterprise toolchains and adapt to your technology landscape quickly.

Load Testing Tools:

Apache JMeter (expert level)

LoadRunner (HTTP/TruClient)

NeoLoad

Gatling

Locust

Scripting & Automation:

Java, Groovy, Python, Shell

Jenkins, GitLab CI/CD

Ansible, Docker

Monitoring & Profiling:

Dynatrace, AppDynamics, New Relic

Grafana/Prometheus

Elasticsearch/Kibana (ELK Stack)

Cloud & Infrastructure:

AWS (CloudWatch, ECS, EC2, RDS)

Azure Monitor, Azure App Insights

Docker/Kubernetes Performance Testing

Databases & Queues:

PostgreSQL, MySQL, Oracle, MS SQL Server

Redis, Kafka, RabbitMQ

🧾 Certifications

✅ ISTQB Certified Advanced Level – Test Analyst

✅ Certified JMeter Performance Engineer (BlazeMeter)

✅ AWS Certified Cloud Practitioner

✅ Scrum.org – PSM I (Professional Scrum Master)

These qualifications reflect my deep domain knowledge, attention to detail, and alignment with industry best practices.

💼 Selected Projects

Here are some real-world examples of where I’ve made a measurable impact:
💻 Large Financial Platform (Germany)

Load tested a high-volume online banking application

Integrated JMeter with Azure DevOps for nightly regression runs

Reduced login response time by 46% and achieved 100% SLA compliance pre-launch

🛒 Global E-Commerce Portal (Retail, DACH Region)

Created a full performance test suite for peak season readiness

Simulated 1 million users/day during Black Friday

Identified a major SQL bottleneck and provided tuning that saved approx. €30K/month in cloud costs

🏛 Public Sector Application (EU)

Conducted stress testing for a citizen-facing services platform

Used Gatling and Dockerized test runners in Kubernetes

Ensured system maintained <2s response times under concurrent usage from 7 countries

📌 Why Clients Choose Me

🧠 Deep Expertise, Not Just Tool Usage
Performance testing is much more than pushing a “Start” button. I analyze the full ecosystem—from frontend latency to backend resource consumption—and understand how they impact your users and business.
💬 Clear Communication
I bridge the gap between technical and non-technical stakeholders. Whether you need developer-level debugging or executive summaries, I adapt my messaging accordingly.
⚡ Fast Ramp-Up
I’m used to jumping into fast-paced environments. I require minimal onboarding and begin adding value within days.
🔄 Agile Collaboration
I integrate seamlessly into Agile and DevOps pipelines. Performance testing is not an afterthought—it’s part of your CI/CD and SDLC with me on board.
🛡️ Risk Mitigation & Business Continuity
Avoid post-launch disasters. My job is to ensure your system survives peak usage, product launches, audits, or sudden spikes in user traffic—without downtime or data loss.

🧩 Typical Engagement Models

I work flexibly based on your needs:

Short-term project-based contracts (test planning, test cycles)

Long-term staff augmentation (monthly retainer or hourly)

Remote or on-site (Germany / DACH)

NDA, ISO-compliance, and data protection ready

📫 Contact Information & Availability

📍 Location: Germany (open to remote across EU)

💼 Availability: Up to 40 hours/week

📧 Contact: [Insert email or freelance.de profile link]

🌍 Languages: Fluent in German (C2) and English (C1)

I’m open to:

Freelance engagements (Freiberuflich)

Subcontracting via agencies

Interim consulting roles

Enterprise-level testing projects

🚀 Let’s Optimize Your System’s Performance—Before It’s Too Late
If your application is critical to your business, performance is not optional—it’s essential. Whether you're preparing for a product launch, a regulatory audit, or a traffic spike, I ensure your infrastructure holds up under pressure and performs consistently.
Let’s connect and discuss how I can help you build, test, and deliver high-performing, scalable, and future-proof systems.
Ready to get started? Send me a message right here on freelance.de, and let’s make your performance goals a reality.
Thanks for reading! I look forward to collaborating with you.