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Freddy R.

Amsterdam, Netherlands

$60/hr
4.6
8 jobs

Is your legacy Java monolith slowing down your deployments or driving up cloud costs? I help companies modernize their tech stack using Scala, Cats Effect, and Akka/Pekko to build resilient, functional systems that scale. Moving from Java to Scala isn’t just a syntax change—it’s a performance shift. I specialize in the "Strangler Pattern," allowing you to migrate critical modules into high-performance microservices without interrupting your production environment. Why work with me? - Pure Functional Expertise: I leverage Cats and Cats Effect to build type-safe, asynchronous systems that eliminate entire classes of runtime bugs. - High-Concurrency Mastery: Using Akka and Pekko, I design actor-based systems capable of handling massive throughput and real-time data processing. - Modern Data Stack: Deep experience with Kafka for event-streaming and Apache Pinot for real-time analytics. - Cloud Optimization: I don't just write code; I tune the JVM. I’ve helped clients slash GCP/AWS spend by optimizing resource allocation and implementing smart autoscaling. A "Big Tech" partner for your US team: Based in the EU, I provide a strategic time-zone overlap. I can build while your US team sleeps and be available for syncs during your morning—creating a high-velocity, 24-hour development cycle.

  • Java
  • Software Architecture & Design
  • Scala
  • Amazon Web Services
  • SQL
  • Kubernetes
  • Database Design
  • Docker
  • Apache Kafka
  • API
  • Database
  • Play Framework
  • Git
  • RESTful API
Ankit K.

Amstelveen, Netherlands

$65/hr
4.9
3 jobs

I am a highly motivated, passionate Engineering Lead cum hands-on DevOps engineer/architect with quality experience in software design and development using open source technologies. I strive to work with the motto “Simple is difficult enough” and set high standards around quality, maintainability, observability and performance of what we deliver as a team. Skills & Experience Technology and Frameworks: Java, Scala, Akka, Akka-http, Akka-Streams, Cats, CatsIO, Kafka, Cassandra, ELK stack, Lucene, Hibernate, Jersey, SpringBoot, Spring-Security, Apache Camel, JAX-WS, JAX-RS, Javascript, ReactJS, AngularJS, Pentaho Kettle, Javascript, Typescript, Node.js, Lit-HTML, Polymer, Google Dialogflow DevOps Environment: Docker, Vagrant, Ansible, mvn, git, svn, cvs, ant, hudson, jenkins, sbt, nexus, intellij, eclipse, TFS, Ubuntu, OSX, Prometheus, ELK, OpenTracing, Azure DevOps Databases: Postgres, Oracle, DB2, SQL Server, MySQL, Apache Cassandra, SQL Server, MongoDB Cloud environments: AWS EC2, RDS, S3, Microsoft Azure Methodologies: Agile, Scrum, XP, Kanban, Kata, Lean Current Interests: Machine Learning, Applying Functional Programming, Kubernetes, Istio, Running in the cloud

  • Java
  • Spring Boot
  • Scala
  • SQL
  • JavaScript
  • Node.js
  • Kubernetes
  • Ansible
  • AngularJS
  • Azure DevOps
  • Akka
  • Apache Kafka
  • J2EE
Mostafa R.

, Netherlands

$60/hr
4.9
6 jobs

I am a Full Stack Developer, I have published Tens of Mobile & Web Applications. I am specialized in iOS & PHP "Laravel" Development. I believe that a great app must have a great UX, so I'm always keen to propose and develop the best UX practices. Technical Skills: * Computer Science Graduate * Proven experience with iPhone app development and proficient in SWIFT * Solid understanding of object-oriented programming * Experience with third-party libraries and APIs * Experience working with remote data via REST and JSON * Knowledge of memory management and multi-threading * Care a lot about good UX design * Don’t skimp on tests and can swiftly debug issues * Comfy with Git, Git-flow, and GitHub * Willing to do the tedious things that make a good app great * Experience with Cocoa Touch APIs * Implementation of automated testing platforms and unit tests * Solid understanding of the full mobile development life cycle

  • Swift
  • Objective-C
  • iOS Development
  • Laravel
  • Oracle Siebel
Reza M.

Almere Stad, Netherlands

$40/hr
5.0
2 jobs

Hello! I'm a passionate and dedicated freelance developer with over 20 years of experience in building robust web, enterprise, and mobile applications. My expertise spans across both front-end and back-end technologies, allowing me to deliver full-cycle development solutions tailored to your needs. I pride myself on my ability to communicate effectively and deliver projects on time and within budget. 𝗦𝗸𝗶𝗹𝗹𝘀 • Web Development Frameworks: React, Angular, Vue.js, Node.js • Backend Technologies: Python (Django, Flask), PHP (Laravel), Java Spring • Mobile Development: React Native, Flutter • Database Management: MySQL, MongoDB, PostgreSQL • Cloud Services: AWS, Azure, Google Cloud, Digital Ocean • DevOps: Docker, Kubernetes, CI/CD pipelines, GitHub Actions • CMS Expertise: WordPress, Shopify, Magento, WooCommerce • AI/ML: Machine Learning (scikit-learn, TensorFlow, PyTorch), Deep Learning, Natural Language Processing (NLP), Computer Vision, Large Language Models (LLMs) • SEO: Keyword Research, On-Page Optimization, Off-Page Optimization, Technical SEO, SEO Auditing, SEO Analytics, Search Console, Google Analytics • QA: Test Automation (Selenium, Cypress, Appium), Functional Testing, Regression Testing, Performance Testing, API Testing, Usability Testing, Test Planning, Defect Tracking, Agile Testing Methodologies • Technical Project Management: Agile Methodologies (Scrum, Kanban), Waterfall, Risk Management, Project Planning, Project Scheduling, Budget Management, Stakeholder Management • Business Analysis: User Stories, Use Cases, Business Process Modeling/Redesign, Data Flow Diagrams, Prototyping, Stakeholder Interviews, Workshops, Requirements Documentation 𝗦𝗲𝗿𝘃𝗶𝗰𝗲𝘀 𝗢𝗳𝗳𝗲𝗿𝗲𝗱 • Custom Web Application Development • E-commerce Solutions • AI-Powered Solutions • API Development and Integration • Website Redesign and Optimization • Performance Tuning and Security Enhancements • Agile Project Management and Scrum Master Services • QA Services • Business Analysis • SEO Audits and Optimization • Ongoing Maintenance and Support 𝗪𝗼𝗿𝗸 𝗘𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲 Freelance Developer | Upwork | 2016 – Present • Successfully completed over 50 projects, ranging from small business websites to complex web applications. • Developed a custom e-commerce platform using React and Node.js that increased client sales by 30%. • Integrated third-party APIs for payment processing and shipping solutions. • Developed and deployed a machine learning model to predict customer churn for a SaaS client, resulting in a 15% reduction in churn rate. 𝗖𝗲𝗿𝘁𝗶𝗳𝗶𝗰𝗮𝘁𝗶𝗼𝗻𝘀 • AWS Certified Solutions Architect • Google Cloud Professional Developer • Oracle Certified Java Programmer • IREB Certified Requirements Engineer • Certified Scrum Master 𝗔𝘃𝗮𝗶𝗹𝗮𝗯𝗶𝗹𝗶𝘁𝘆 I am available for both short-term projects and long-term collaborations. My typical working hours are flexible to accommodate different time zones. Let’s discuss how I can help you achieve your project goals! Feel free to reach out for a consultation or to discuss your specific requirements.

  • Java
  • MERN Stack
  • Mobile App
  • Project Management
  • Cybersecurity Management
  • DevOps
  • Business Analysis
  • JavaScript
  • Python
  • Jira
  • Git
  • Docker
  • Kubernetes
  • AI App Development
  • AI Chatbot

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