Hire the Best Sitecore Developers in Warsaw, PL

- Over 12 years of software development experience in various-sized projects; - Strong experience in designing and developing OOP solutions using .NET platform; - Solid experience in Sitecore CMS v6.5 - 9 - Great experience in business domain and functional requirements analysis, building appropriate architectural solutions; - Strong experience in web-client technologies such as HTML, XML, JS, CSS; - Good experience in system integration with .NET based Web Services; - Experience in “spaghetti” code refactoring and business logic performance optimization; - Experience in existing software support and maintenance; - Technology domination was achieved in ASP.NET, Sitecore, ASP.NET MVC, MSSQL Server.

⭐⭐⭐⭐⭐ "If there is a 10-star rating, I would rate him 10 stars! Abraham is the best. Keep up the extremely good work!" If you want a business partner to help bring your vision to life, while feeling like an old friend has your back, then I am exactly what you are looking for. Over my very diverse career, both freelancing as a Top Rated freelancer on Upwork and working around the world, I've helped develop, maintain, and improve web and mobile apps for all sorts of clients. My most well known clients/projects/jobs include: ➡️ Dream 11 App (Official ICC Partner with 2M+ users) ➡️ DirecTV App for AT&T (Fortune 500 Company) ➡️ Bayer (Fortune 500 Company) ➡️ Like Digital & Partners (Award Winning Luxury Web Design Company) If you need a high-performance, user-friendly app or need a website that leaves your clients breathless, then I am able to assist you throughout the whole process: from creating design mock-ups, to choosing the best hosting solutions. Though I specialize in creating mobile apps and websites, I am more than capable of working with servers and APIs. Over the years, I have developed a reputation for being excellent in initiative and self-management. My projects would usually put me in a position of mentorship, or greater responsibility. You won't need to worry about my progress with a task, as I prioritize clear and transparent communication with my clients. So what can you expect by having me in your project? 🏆 The best and latest programming standards in the industry 🚀 Rapid delivery of results 🤝 A "team player" mentality 😃 Passion and energy 🌟 Excellence and satisfaction every time In summary, if you need someone you can rely on to get something done right, or you want someone to help you build your dream and be with you every step of the way, then you needn't look further. If there is one thing I love doing above all else, it's exceeding your expectations. ✅ Shall we discuss your project?

Hello, Im a developer with 15 years of working experience. I have been working for companies from Russia, USA, Canada, Australia, Philippines. Have created applications for desktop, mobile and web. Main specialization - .NET stack (WPF, ASP.NET, Avalonia, MAUI), but also have experience in other areas. Have bachelor degree in applied math and computer science. Have rich expirience of using Selenium for automatization work with websites or data crawling. Main skills: Back-end: Asp.Net MVC, basic knowledge of NodeJS. Desktop: WPF, Avalonia. Mobile: MAUI, Xamarin. Front-end: Angular, Typescript, JQuery, AngularJS, Bootstrap, Chrome extensions Testing: Selenium, NUnit, Moq Infrastructure: Teamcity, Octopus, Azure Devops, gRPC, Git, SVN, JIRA Have worked with different DB: mostly MS SQL, but also MySQL, SQLite, Postgres. Have experience using ORM (EF Core, NHibernate) and directly accessing DB (Dapper). Could work both in team and as a separate developer. I have good learning ability - if I don't know something, usually it doesn't take much time to understand it. I have good skills in understanding code written by other developers, know how to write unit tests. I'm working with AI-tools: Claude code, Gemini, QWEN code.

I take end-to-end ownership of AWS production infrastructure at scale, from Kubernetes and Terraform to CI/CD, security and low-downtime migrations, cutting costs by up to 40% and speeding production deployments 5x. I act as the AWS DevOps lead and technical owner for each project, responsible for architecture, technical decisions, implementation oversight and production delivery. I have delivered more than 10 complex AWS and cloud infrastructure projects for B2B SaaS, B2C products and AI startups. 📈 Selected Results ✅ Reduced AWS infrastructure costs by up to 40% through architecture review, terraform and IaC improvements ✅ Cut infrastructure provisioning time from 4 hours to 20 minutes using terraform and reusable IaC modules ✅ Reduced deployment time from 40 minutes to 8 minutes with CI/CD automation ✅ Built and maintained more than 100 CI/CD pipelines ✅ Automated up to 80% of recurring DevOps work with IaC, terraform and policy-based controls ✅ Completed AWS and kubernetes production migrations with under 5 minutes of downtime ✅ Deployed and improved production kubernetes environments across AWS EKS and k8s clusters ✅ Standardized docker build, release and rollback workflows ✅ Improved cloud security controls and SOC 2 readiness for production workloads ✅ Added automated backups, tested recovery and rollback procedures supporting SOC 2 requirements 🎯 How I Can Help 🔹 Work as your AWS DevOps Engineer to stabilize production infrastructure and resolve recurring operational issues 🔹 Support AWS design decisions as an AWS DevOps Engineer focused on reliability, cloud security and growth 🔹 Deploy and harden kubernetes environments, including k8s on Amazon EKS 🔹 Improve docker images, registries, runtime standards and deployment safety 🔹 Build CI/CD workflows for testing, releases and rollback 🔹 Deliver terraform and IaC changes with reviewable plans and controlled rollout 🔹 Migrate applications and infrastructure with minimal downtime across EKS and k8s environments 🔹 Implement monitoring, alerting, backups and disaster recovery for docker and cloud workloads 🔹 Reduce cloud costs through right-sizing, architecture cleanup and automation 🔹 Prepare cloud security controls and evidence for SOC 2, HIPAA, ISO 27001, GDPR and PCI DSS audits 🛠 Core Stack 🔸 AWS | EKS, ECS, EC2, Lambda, RDS, Aurora, S3, CloudFront, IAM, Route 53, WAF, Security Hub 🔸 kubernetes | EKS, AKS, GKE, Helm, Argo CD, GitOps, ingress, autoscaling, k8s operations 🔸 Infrastructure as Code | terraform, Terragrunt, CloudFormation, Ansible , IaC standards 🔸 CI/CD | GitHub Actions, Jenkins, Azure DevOps, CircleCI, gitlab ci/cd mlops 🔸 Containers | docker, ECR, image scanning, registry policies 🔸 Observability | Prometheus, Grafana, CloudWatch, Datadog, Sentry, OpenTelemetry 🔸 cloud security | IAM, RBAC, secrets management, vulnerability scanning, DevSecOps controls, SOC 2 support 🔸 Data Services | PostgreSQL, RDS, Aurora, Redis, DynamoDB, OpenSearch 🔸 Systems | Linux, Nginx, Bash, Python My work may overlap with senior Full Stack Developer teams and roles such as AWS Architect, Azure Architect, DevOps Kubernetes and cloud engineer. I also support aws lambda, cloud migrations and ci cd delivery when these are part of the project scope. AWS is my primary cloud. I also work with Azure and GCP when the project includes an existing multi-cloud environment, migration or platform-specific requirements. ⚙️ How I Work 1️⃣ As your AWS DevOps Engineer, I review the current architecture, kubernetes platform, docker workloads, cloud security risks and bottlenecks 2️⃣ As your AWS DevOps Engineer, I define priorities, terraform changes, IaC scope, SOC 2 requirements and expected outcomes 3️⃣ As your AWS DevOps Engineer, I improve infrastructure, CI/CD, k8s operations and SOC 2 controls 4️⃣ As your AWS DevOps Engineer, I test docker deployment, rollback, backup and recovery procedures 5️⃣ As your AWS DevOps Engineer, I deliver clear documentation for k8s, IaC and cloud security handover You work directly with me throughout the project. I remain responsible for communication, delivery quality and final technical decisions. For larger scopes, trusted DevOps specialists can support execution under my technical supervision. I remain your main point of contact and responsible for delivery. My delivery process includes k8s review, docker release checks, pipeline validation, SOC 2 evidence mapping and cloud security verification before handover. 💬 Tell me what is happening with your infrastructure, where the risks or bottlenecks are, and what outcome you need. Send me a message, and we can review the problem and discuss the next steps on a call.

Expert .NET Software Engineer with Versatile Skills - Your Solution for Cutting-Edge Development Are you in search of a highly skilled and reliable freelance .NET Software Engineer to tackle your most demanding projects? Look no further! With a proven track record of delivering top-notch solutions, I bring a broad range of expertise that covers the entire .NET ecosystem. My experience encompasses various technologies, frameworks, and tools, making me the ideal candidate for your development needs. Skills and Technologies C#: With in-depth knowledge of C#, I can craft robust and efficient code, ensuring seamless functionality and optimal performance. .NET Framework & .NET 6: My proficiency in both versions of .NET allows me to leverage the latest features and enhancements, creating future-proof solutions. Docker: Experience with Docker empowers me to build scalable, containerized applications, streamlining deployment and management. RabbitMQ: By employing RabbitMQ, I enable seamless communication between distributed systems, ensuring smooth data flow and integration. Grafana: With Grafana, I provide advanced monitoring and visualization capabilities, empowering you to make data-driven decisions. HTML, CSS: My expertise in front-end technologies guarantees polished and user-friendly interfaces. SQL & PostgreSQL: I possess a deep understanding of SQL and PostgreSQL, allowing me to design efficient database structures and execute complex queries. Windows PowerShell: Proficiency in PowerShell enables me to automate tasks, streamline processes, and enhance productivity. XML, JSON: Handling data interchange is second nature to me, thanks to my mastery of XML and JSON. LINQ: I use LINQ extensively to query and manipulate data with ease, contributing to efficient and maintainable code. Object-Oriented Analysis (OOP): My strong grasp of OOP principles ensures well-organized, modular, and extensible code. Entity Framework Core: Leveraging Entity Framework Core, I facilitate database interactions, providing a solid foundation for your applications. SignalR & ASP.NET MVC: By incorporating SignalR and following the MVC pattern, I develop real-time, interactive web applications with ease. SOLID Principles: I adhere to SOLID principles to create scalable, maintainable, and flexible codebases. Unit & Integration Testing: My dedication to testing guarantees reliable and bug-free software, resulting in a positive user experience. RESTful WebAPI & Swagger: I create RESTful APIs with Swagger documentation, ensuring seamless integration and ease of use for consumers. Test-Driven Development (TDD): My TDD approach leads to high-quality code and rapid iterations, saving time and resources. Domain-Driven Design (DDD): I apply DDD principles to build software that aligns perfectly with your business domain and requirements. Reflection: My understanding of reflection allows me to perform dynamic type loading and enhance the flexibility of your applications. Experience with Visual Studio 2022: I'm well-versed in the latest version of Visual Studio, enhancing my development workflow and productivity. Version Control & Issue Tracking: Proficiency in Git and SourceTree enables efficient collaboration, while Jira, Confluence, and Redmine help streamline project management. Continuous Integration & Continuous Deployment (CI/CD): I implement CI/CD pipelines, ensuring rapid and reliable software delivery. English (written and oral) - Intermediate (B1): My effective communication skills allow me to seamlessly collaborate with international teams and stakeholders. When you hire me as your freelance .NET Software Engineer, you can rest assured that your projects will be delivered with precision, on time, and within budget. Let's discuss your requirements and take your software development to the next level! Contact me today for a free consultation.