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I'm a Senior DevOps engineer with more than 10 years experience in solutions architecting for different businesses

Mobile App Developer specializing in React Native & Flutter. I help startups build cross-platform iOS & Android apps – from validated MVP to App Store launch. Backed by a 330+ engineer full-cycle team with 20+ years of experience, I deliver mobile applications that go beyond clean UI – covering backend API, cloud infrastructure, QA, and AI integration in a single engagement. Whether you're a founder validating your first mobile idea or a product team scaling an existing app, I focus on one goal: shipping a product that users download, use, and come back to. 💡 Case Studies 🧠 BibleLytics (Wellness & AI, Startup) – Built a full AI-powered mobile MVP from discovery phase to App Store launch. The app guides users to Bible verses based on emotional state using vector search across 400+ mapped emotions and OpenAI GPT-powered prayer generation. Delivered cross-platform iOS + Android from a single Flutter codebase, plus a web admin dashboard and landing page. Stack: Flutter · GCP · OpenAI GPT · Vector Search · JavaScript Result: Budget-efficient cross-platform delivery · validated concept before development investment · scalable architecture ready for multi-version expansion. ⚖️ Legal Beagle (LegalTech SaaS, USA) – Developed a white-label legal services platform with a 12-person team. The Android app enables real-time attorney-client collaboration: video consultations, secure messaging, e-signing, and full case management on mobile. Integrated CRM and legal document tools (Clio, DocuSign) with seamless cross-platform delivery across Android, iOS, and web. Stack: Kotlin · Android SDK · Swift · React Native · TypeScript · PHP 8 (Symfony) · AWS ECS Fargate · Firebase · Docker · CircleCI Result: Scalable white-label LegalTech SaaS · enterprise-grade security & data protection · consistent UX across all platforms and device types. 📡 Boarding Path (Smart Navigation, iOS) – Led the discovery phase for a native iOS indoor navigation platform. Conducted technical feasibility analysis, vendor evaluation (IndoorAtlas, beacons), UX design for complex indoor environments, and full documentation to launch development with zero guesswork. Stack: Swift · Native iOS · Python · Django · IndoorAtlas · AWS · PostgreSQL Result: Concept validated before a dollar was spent on development · technical risks eliminated upfront · market-ready iOS roadmap with full vendor alignment. 🏅 North Jersey Vipers (Sports, USA) – Built a cross-platform mobile app for a US sports club – enabling content sharing, team updates, and secure media storage for players, coaches, and parents. Delivered iOS + Android from a single React Native codebase within a tight budget and timeline. Stack: React Native · JavaScript · Nest.js · Node.js · AWS Result: Cost-optimized cross-platform delivery · secure content storage · minimized long-term maintenance overhead. 📱 Platforms & Frameworks React Native · Flutter · Expo Native iOS: Swift · SwiftUI · Objective-C Native Android: Kotlin · Java Progressive Web Apps (PWA) 🌐 Backend & APIs Node.js · Nest.js · PHP · Symfony · Python · Django REST APIs · GraphQL · WebSockets · Firebase Realtime Database ☁️ Cloud & Infrastructure AWS (ECS Fargate, Lambda, S3, RDS, CloudFront) GCP · Azure · Docker · Kubernetes CI/CD: Bitrise · CircleCI · GitHub Actions 🤖 AI Integration OpenAI GPT · Vector Search · AI-powered mobile features LLM-based content personalization · Intelligent recommendations AI chatbot integration for mobile apps 🔗 Mobile Integrations Stripe · Clio · DocuSign · IndoorAtlas Firebase Push Notifications · WebRTC (video consultations) App Store & Google Play – full submission and launch support 🔐 Security & Compliance HIPAA-aware mobile development · GDPR-compliant data handling Secure messaging · E-signing · Enterprise-grade authentication Biometric auth · End-to-end encryption Why teams choose us: ✅ Full platform coverage – React Native, Flutter, Native iOS (Swift) & Native Android (Kotlin) from one team, no handoffs ✅ 330+ engineers – backend, DevOps, QA, and UI/UX always available alongside mobile development, so you never hit a skills gap ✅ 2,250+ delivered projects across HealthTech, LegalTech, FoodTech, Sports, Wellness, and B2B SaaS ✅ Full-cycle delivery – from discovery and UX design to backend API, cloud infrastructure, and App Store submission ✅ AI-ready from day one – we integrate OpenAI, vector search, and intelligent features into mobile apps without slowing the timeline Send me a message – tell me about your app idea, and I'll respond within a few hours with a clear plan and honest timeline estimate.

I have more than 12 years of working experience in different industries and technologies. I have worked as Senior System & Network Admin / DevOps Infrastructure Engineer for different sectors like Telecoms, Software Houses and MSPs. During this period I was lucky enough to work on very diverse technologies like VMware products, Microsoft Servers, Linux administration, VoIP, CRMs, Storages, Office365, Firewalls, SQL servers, Freepbx, 3CX, OSTicket, Connectwise, UVDesk, Solarwinds NPM, SAM, NetFlow, RMM, Splunk Operations, Powershell scripting. My DevOps Skills are as follow; AWS EC2, VPS, S3, Docker, AWS Connect, CloudWatch, IAM Roles, GCP Filesotre, Logs & Monitoring, Packer, NewRelic, IPSec VPNs, Billing, Patch Management, CI/CD, Firewall, SVN, scalability, Databases and much more. Completed many projects related to System Administration, VoIP, DevOps projects, migrations from on-premises to cloud and also set up new Infrastructure on AWS, GCP.

🌐 Cloud & DevOps Engineer | 🖥️ Backend Developer I’m an engineer who enjoys the challenge of making software work beautifully in the real world. I build systems that run behind the scenes, turning complex technical hurdles into reliable solutions. ☁️ Cloud & DevOps I focus on keeping infrastructure solid and deployments stress free. Using AWS and Azure, I build stable environments with Docker and Kubernetes to keep things consistent. I love automating workflows and using Infrastructure as Code to make sure everything runs exactly as it should. 💻 Backend Development As a backend engineer, I handle the logic that powers an application using Python and Java. Whether I am designing RESTful APIs or organizing data in SQL and NoSQL databases, I prioritize security and speed. I aim for clean code that is easy to scale and simple to maintain. I’m ready to help your project succeed.

I help businesses eliminate deployment bottlenecks, improve system reliability, and build cloud infrastructure that scales without increasing operational complexity. I'm a Senior DevOps & Cloud Engineer with 7+ years of experience delivering production-grade infrastructure for startups and growing businesses across Amazon Web Services (AWS), Azure, GCP, and hybrid cloud environments. CKAD-certified with deep expertise in Kubernetes, Docker, CI/CD automation, deployment automation, Linux administration, and cloud-native technologies. I've completed 200+ cloud and DevOps engagements, helping teams automate deployments, optimize AWS infrastructure, modernize Kubernetes environments, and build scalable platforms that support business growth. From Amazon EC2 and Amazon S3 to Kubernetes clusters, Terraform deployments, and CI/CD pipelines, I focus on creating secure, reliable, and high-performing infrastructure that allows teams to ship faster and operate with confidence. → Free infrastructure audit included with every engagement. Message me first if you want a no-obligation technical review of your current AWS, Kubernetes, Docker, Terraform, or CI/CD environment. ────────────────────────────────────────── 🛠️ Problems I Solve ✔️ Manual deployments are causing delays and failed releases. I build CI/CD pipelines using GitHub Actions, GitLab CI/CD, Jenkins, Git, and deployment automation best practices. ✔️ Infrastructure that struggles to scale. I design and deploy auto-scaling, high-availability architectures across AWS, Azure, and GCP using Kubernetes, Docker, Terraform, and Infrastructure as Code. ✔️ Rising cloud costs with little visibility. I optimize AWS environments through right-sizing, architecture improvements, resource audits, and cost-control strategies. ✔️ Limited production visibility. I implement observability solutions using Prometheus, Grafana, ELK, CloudWatch, and centralized monitoring platforms. ✔️ Kubernetes complexity is slowing development teams. I manage EKS, AKS, GKE, and bare-metal Kubernetes clusters with Helm, ArgoCD, GitOps workflows, and production-ready deployment automation. ✔️ Security and compliance concerns. I harden Linux environments, integrate DevSecOps tooling, and implement security best practices from day one. ────────────────────────────────────────── ☁️ Cloud Infrastructure & DevOps ✔️ Amazon Web Services (AWS): Amazon EC2, Amazon S3, RDS, VPC, EKS, CloudFormation, Lambda, IAM, CloudWatch ✔️ Azure (VMs, AKS, Azure DevOps, Azure Monitor) ✔️ GCP (GKE, Cloud Run, Cloud Monitoring) ✔️ Hetzner, DigitalOcean, Oracle Cloud, OpenStack ✔️ Infrastructure as Code: Terraform, Ansible, CloudFormation ✔️ Linux (Ubuntu, CentOS, Debian, Amazon Linux ✔️ Networking: VPCs, Load Balancers, DNS, VPNs, Security Groups ✔️ Git workflows, deployment automation, and infrastructure lifecycle management ────────────────────────────────────────── 🚀 Kubernetes & Containerization ✔️ Amazon EKS · Azure AKS · Google GKE · k3s ✔️ Docker containerization and Kubernetes orchestration ✔️ Helm · ArgoCD · GitOps workflows ✔️ Blue-Green & Canary deployments ✔️ Auto-scaling · High Availability architecture ✔️ Ingress: NGINX, Traefik · Service Mesh: Istio ✔️ API Gateways: AWS API GW · Azure APIM · GCP API GW ────────────────────────────────────────── ⚙️ CI/CD & Automation ✔️ GitHub Actions · GitLab CI/CD · Jenkins · ArgoCD ✔️ Git workflows, branching strategies, and release automation ✔️ Deployment Automation for Kubernetes and cloud infrastructure ✔️ Automated testing integration (Pytest, JUnit, Playwright) ✔️ Python scripting for automation and operational tasks ✔️ Load testing: Apache JMeter · API testing: Postman ✔️ Infrastructure deployment pipelines ────────────────────────────────────────── 🔒 DevSecOps & Security ✔️ HashiCorp Vault · Trivy · Snyk · SonarQube ✔️ GitGuardian · TruffleHog · KICS ✔️ OWASP best practices · Security-first infrastructure design ✔️ Linux security hardening and vulnerability management ────────────────────────────────────────── 📊 Monitoring & Observability ✔️ Prometheus · Grafana · ELK Stack (Elasticsearch, Logstash, Kibana) ✔️ AWS CloudWatch · Azure Monitor ✔️ Alerting, incident management, and on-call runbooks ────────────────────────────────────────── 💡 Why Clients Choose Me ✔️ Strong AWS, Kubernetes, Docker, Linux, Terraform, and CI/CD expertise ✔️ Multi-cloud experience across AWS, Azure, and GCP ✔️ Focus on long-term reliability, scalability, and maintainability ✔️ Clear communication and dependable project delivery 📩 Ready to build infrastructure that scales with your business? Send me a message with your requirements. I'll review your current environment, identify opportunities for improvement, and provide actionable recommendations to help you deploy faster, scale confidently, and operate more reliably.

I specialize in DevOps, QA, test automation and software development. Skills: Python, R, C++, SQL, HTML/CSS/JavaScript, MongoDB, GraphQL AWS CDK, SeedFarmer, AppSync, API Gateway Docker, Numpy, Pandas, Django, Flask, Kivy Azure, CircleCI, GitHub Actions, GitLab CI Selenium, Scrapy, officeR, Tableau, Shiny, Dash Key Projects: Real estate metacrawler for the german market called Somantic (Flask, GraphQL, MongoDB, Scrapy) GUI Development for automotive applications (C++ Qt/PyQt) DevOps and CI/CD pipeline setups (CircleCI, GitHub Actions) Automation of integration tests for web applications (Selenium, PlayWright) Development and maintenance of sensor simulation software for autonomous driving (C++, Protobuf) Education: M.Sc. in Mechatronics and Information Technology, Technical University Munich B.Sc. in Mechanical Engineering, Technical University Munich Visit my homepage at kreschenski.com for more information on my work and projects.