I'm have experience in these following area for more than 10 years * Linux System Administrator * Web Server: Apache2, Nginx / Setup Letsencrypt SSL * DNS Server : Bind9, PowerDNS, pihole * SMTP Server: Exim4, Postfix * IMAP Server: dovecot * C Programmer * Perl * Shell Script

Most embedded/PCB freelancers specialize in one lane. I've spent 35+ years moving across all of them — IC layout, custom PCB design, embedded firmware, and full-stack software — which means I can take a project from a rough idea through working hardware and the dashboard that controls it, without handing it between specialists. A sample of what that's looked like in practice: a custom industrial communication protocol supporting 1000+ addressable nodes, a cloud-synced clock rendered identically on hardware and web, a mesh-network vibration datalogger for landscaping equipment, sensory prosthetic devices (two U.S. patents came out of that work), and more one-off PCB/firmware jobs than I can list — metal detectors, load cell combiners, stepper drivers, servo hubs, and precision lab instrumentation with full touchscreen control. Core stack: Eagle CAD for schematics/PCB, PIC Assembly and Arduino for firmware, Python/Flask/JavaScript/MySQL for the software side, and the usual embedded comms protocols (I2C, SPI, CAN, RS-485, MQTT). If your project spans hardware and software and you don't want to manage three contractors to get there, let's talk.

Results-driven QA Professional with 15+ years of experience in software testing and development across telecom, storage, and insurance domains. Proven expertise in leading cross-functional teams, implementing automation frameworks, and delivering high-quality products on time. Certified Scrum Master and AWS Cloud Practitioner with strong proficiency in Python, Java, and Agile methodologies. I have the following certifications: Certified Scrum Master(June 2025) AWS Certified Cloud Practitioner (Aug 2023) Certified Business Analytics – Analytic Vidya (Jan 2021) Oracle Certified Java SE 8 Programmer II (Aug 2018) ISTQB Certified Tester (Feb 2012)

🏆 Top Rated 🏆 Computer engineer with experience over 11+ years as a Certified Linux Admin and 7+ years as a Devops. Excellent at developing and maintaining client/server applications. Expertise - *****AWS*****GCP***** AZURE*****Proxmox**** Linux (Certified) AI Engineer | Openclaw | LiteLLM | OpenwebUI ( almost every majorly used AI solutions, updated ) Setting up Agentic AI Proxmox and other VM specialist Firewall deployment (OpnSense ,Draytek etc) Backend and frontend app installation,management and maintenance. WordPress Developer Scripting (bash, perl etc) Docker, Kubernets, Helm Chart, Terraform, Ansible,Jenkins, Git etc PHP developer Python Developer cPanel/Hostinger/WHMCS/Plesk Streaming and OTT Mailserver configuration (Postfix, Dovecot etc) Proxy Servers WordPress optimization Everything related to Linux and Servers. Why should you hire me? + Strong frontend, backend architecture, and database knowledge + Delivering the products on/before time + High Quality of work + Always up-to-date with the latest technologies Soft skills: + Time management + Teamwork + Communication

Full stack developer w/ 12 years experience and focusing on WordPress development and giving clients what they want. Task oriented. Clear communicator. Loves the work, takes ownership of every project. I make myself readily available to my clients 5 days a week and sometimes 6. 'Randall is an honest and available developer. Most developers do not make themselves available to discuss requirements with the client and with the team but randall goes above and beyond the expectation' - Jonathon Bridges 'We really enjoyed working with Randall to complete a rush project. He was easy to work with, in communication regularly and helped us get the job done right.' - Kat Bundy -WordPress -PHP -JavaScript -jQuery -CSS3 -WooCommerce -SASS -mySQL Beyond just tweaking themes, I can offer a high level of WordPress customization, including but not limited to: custom plugins, custom widgets, custom post types and just about any kind of custom functionality you need. If I am one thing it's flexible, client have different methods and needs, no 2 clients are exactly alike. Listening to clients and giving them what they want is what I do. Sometimes a client need an advisor as well as developer, in those situations, I'm adept at providing these kinds a clients a road map to success. 'This was my first experience with Upwork. I couldn't have picked a better partner to help me with my task.' - Joe Cotellese "Randall is super easy to work with, he anticipates issues and is very timely in bringing them up. His skill and cooperation are excellent and he is very accessible. He gets the work done quickly, follows direction and does a great job! He can also think for himself and isn't shy about researching issues. I will happily continue to use Randall for my WordPress development. - Merry Gray "Randall is nothing short of amazing! He is the best developer I've ever worked with. He really came through for us." - Don Slepien

AI Development and Use cases- Develop AI Agents, RAG, MCP, AI Automation, and systems. AI tools - M365 Copilot, Copilot Studio Development, Langchain, n8n, crewAI, even custom AI development with different models. Chatbot and API development as well. Work with low-code and coded technologies such as Zapier, Integromat/make, n8n, TIBCO, Boomi, Azure and BizTalk. I have worked on using different languages for scripting, webhooks, APis in different envs such as PowerShell, Python, Bash, NodeJs, batch, XML, XSLT, etc. In databases I have worked in MSSQL, MySQL, Oracle and NoSQL. In the cloud arena, I have worked with Azure, AWS, and Google Cloud. I have set up networks and virtual instances and configured them. I have even automated a lot of the cloud processes. I also work a lot in web services, creating and calling them. Did a lot of ETL work with XML, Text files, PDF, and JSON. I have worked with REST and SOAP web services. My experiences range from systems administration, architecture, development, automation, AI, and even DevOps. I have worked on projects in many industries, including technology, transport, retail, marketing, healthcare, etc. Some of the applications integrated with: Salesforce, Monday.com, Dialpad, Aircall, Notion, Podio, Docusign, Ezlynx, Mojo, PipeDrive, Wordpress, Google Sheets, Etsy, ShipStation, Outgrow, Shopify, Workable, Quickbooks, CheckFront, FareHarbor, FreshSales, FollowupBoss, Youtube, EventBrite, Paypal, JotForm, Dropbox, Survey Monkey, Google Docs/Forms, Google drive, Signalwire and others I am looking forward to discussing your requirements and working with you on your project. Thank you for your consideration

I've been working with WordPress for over 10 years. No matter the theme, no matter the page builder, I can handle it. I also have great UI/UX skills to complement that. A lot of other freelancers are specialists that either know how to code or know design. I'm a rare blend of both. Here's what I can help with: - WordPress websites -- Working with any template or page builder you may be using -- ACF and custom post types -- Gutenberg blocks -- Email deliverability (make sure your website email doesn't go to SPAM) - New websites - Site redesign - Site migrations - Hosting, email and DNS setup - Google Analytics measurement and reporting - Logo design - Page template design - Landing pages I always act as a true partner and consultant, and not just an "order taker". This is a good thing! If you ask me to do something that doesn't make sense for your business, I will ask clarifying questions to discover what you truly *want* to accomplish and make recommendations that will make an impact. Finally, I have my Google Analytics individual qualification which means I can make sure you can accurately measure the performance of your site.

Hi, I’m Ahsan, a Web Scraping Developer and Video Editor with 5+ years of experience. I deliver data automation solutions and professional video content that help businesses save time and expand their online presence. Web Scraping & Automation • Python, Selenium, BeautifulSoup, Scrapy • Data scraping, web crawling, automation, dashboards • E-commerce scraping, competitor analysis, JSON handling Video Editing & Production • Adobe Premiere Pro, After Effects, Photoshop • TikTok, Reels, YouTube Shorts, promotional ads • Color grading, transitions, VFX, corporate & event videos Whether you need a Web scraper that automates data collection or a video editor who creates content that sells, I’ll make it happen with skill and reliability. Let’s get started!

20 years of experience in multiple multinational companies as a consultant, engineer, and developer. Worked in many environments such as telco companies (Siemens, Nokia Siemens Network, Huawei, Telco Operators), metering companies (Actaris/ITRON, EDMI, Blue Star, Qingdao Techen), mobile money, IoTs, one of the biggest startups in Indonesia and worked in projects across the world. Live with Linux since the year of 2000 (Debian 2.x - potato) till now. Worked on IT/IP network, low-level protocols, metering, scraping, and analytics. Proficient in Golang and some other languages such as Python, Zig, C, C++, and Javascript.. Familiar with Linux embedded systems (build root, raspberry pi, arm SBC). I've done many Lorawan implementations for many applications such as metering, & tracking.   I have worked on AMR/AMI (Automated Meter Reading/Advanced Meter Infrastructure) systems, working from CSD to IP based/4G era until IoT (rf-mesh, PLC, LoRa/Lorawan), and also hacking protocols of various electricity meters or other systems. I’m very familiar with low-level DLMS protocol, FLAG, and proprietary meter protocols such as EDMI Atlas/Genius meter.  I also work on other IoT devices (non-metering) such as RFID/LLRP, RTLS/UWB, BLE, and Lorawan for tracking. Other works mainly in data analytics and performance/optimization. One of the optimization samples, where I optimize the reading/processing ~4GB document in less than 0.5s (yes, less than 500ms) can be seen in my GitHub: rissw/not_yet_hit_the_wall. Or how I process ~42GB single structure JSON data of an insurance data and join the data within in less than 3 minutes. (While the original Python script from the client can complete the task in some hours) in my work samples. So, what can I do for you? - IoT consultation - IoT Development - Lorawan-related job (Chirpstak v3/v4, TTN, and its customization, you name it) - Backend development, or any kind of development especially in Golang - Metering protocol or other protocols...I love protocol, i love data in hex and can stare on hex for hours. - Data parsing, especially when you need the process to be fast, correct and use less CPU/memory. - Converting your existing code (Python, Perl, Javascript) which is less performant to Golang or Zig. - Edge computing with single board computer (Raspberry, Orange Pi, etc) - Network-related stuff, VPN (esp Wireguard), BPF, protocol analytics? lets talk...! Another side of me... - I'm not a Frontend engineer, not that I'm unable to do javascript frontend libraries & frameworks, I do know Vue and React, however, it's not my good side of the development to build sophisticated/beautiful frontend. However, I do know how it works and how to modify/enhance the frontend functionality. - I'm not a DevOps engineer, however, I've worked on some projects running on Digital Ocean, AWS, Azure, Fly.io, and Oracle Cloud. I'm good with docker and quite familiar with helm chart, and Argo CD. - I'm a fast learner and open to new challenges, hit me with your requirements, I might have already done a similar project or touched the subject to some extent. I might be able to do a quick catch-up on your subject/requirement. - If you need more than 1 day of discussing what you want to do, or are still not sure what you want to do, I don't have much time to do so, but you can always hire me for consultation. Still not sure? Drop a chat during my workday (09.00 - 17.00 GMT+7), I'll be quick to respond.

Data Scientist specialized on Machine Learning, Supervised Learning, Deep Neural Networks, Recurrent Neural Networks and Reinforcement Learning. I have worked on a wide variety of industries: finance, bank, hedge funds, manufacturing, technology, domain names, horse wranglers and betting games. With machine learning I have produced stock market strategies with a compound annualized return near 20% (yearly), which are currently publish on my web page (see below). In 2022 I was certified as AWS Machine Learning Specialist. The first 10 years of my professional career I had worked as a backend developer, coding high availability services on Python, C, Java and Perl. Since 2012 I am working full time as a data scientist. I enjoy machine learning. I am not a standard data scientist: I have studied the implementation details of the main ML algorithms, allowing me to customize them according to the nature of the working problem. Since 2014 I am working developing ML models freelance, on the Upwork platform. I have more than 11,000 net hours, 35 different jobs, ranked with 4.99 stars and 100% job success rate. - Programming (currently): Python - Programming (past): R, Perl, Java and C. - Machine Learning Models: Naive Bayes, Fisher Discriminant Analysis, Nearest Neighbor, Multivariate Regression, Logistic Regression, Decision Trees (Chaid and CART), Support Vector Machine, Genetic Algorithm and PSO - Ensembles: Random Forest, Gradient Boosting Machine, Bagging and Boosting - Deep Learning: Traditional Neural Networks (Backpropagation, CPN, SOM), Deep NN, Convolutional NN, Recurrent NN, LSTM and Bidirectional Recurrent NN. TensorFlow with GPU using Low Level API and Keras. - Reinforcement Learning: Deep Q networks, Policy Gradient, Actor-Critic, Actor-Critic with Experience Replay (ACER), Soft Actor-Critic (SAC), Adversarial Imitation Learning, Hindsight Experience Replay (HER), Proximal Policy Optimization and TPRO - Clustering: Hierarchical, K-Means, Fuzzy C-Means, EM, DBSCAN, OPTICS, Clara and PAM. - Hadoop: Map/Reduce, Pig, Hive and Spark - AWS/Azure Example of my works: gmoncarz.github.io/machine_learning_tour