Extensive experience with multiple quantitative approaches with large data sets. Developer in Python, Java, R, SQL and noSQL databases, as well as C# and Microsoft Applications. Experience trading multiple asset classes including equities, fixed income, and currencies, in delta one and volatility structures. Have been focused on volatility markets for past 8 years, prior to that in macro markets.

✅ Excel Mastery: ✓ Proficient in advanced formulas, dynamic task macros, and data dashboard development ✅ VBA Scripting ✓ Comprehensive experience in Excel VBA. ✓ Expertise in report optimization, automation, and interactivity. ✓ Skilled in troubleshooting and enhancing VBA code. ✅ Integration Expertise ✓ Leverage VBA to interface Excel with other Microsoft applications like PowerPoint, Outlook, Word, and SQL. ✅ Web Development ✓ Proficient in PHP, MySQL, HTML5, CSS, and JavaScript. ✅ Content Management ✓ Experienced in the WordPress platform ✅ MS Office Suite (2003 - 2021): ✓ Expert-level proficiency in tools including Visio, Word, Excel, PowerPoint, and Access.

AI integration is a focus! "AI agents will replace most SaaS/mobile apps in the near future, no more boring forms, no app stores, no strict data structures," said Microsoft CEO Satya Nadella. To build something bigger than no-code AI agents, you would need a contractor with a wide skill set in Python, prompting, data, as well as DevOps, CloudOps, MLOps. DevOps is automation, cost reduction, competitive edge, ... it's a mindset for the entire team! I'm proud of hundreds of successfully delivered projects for SMB and Enterprise. I'm a full-stack technical lead with broad expertise. I can work alone, but often involve offshore teammates for higher efficiency and optimal cost. I mentor, contribute to open source, build AI products, support the local community, and I donate a % of my profits to humanitarian needs due to the situation in my home country. Stand with Ukraine!

Sr. Full Stack Developer with expertise on Web, Desktop and Mobile platforms. More than 5 years of experience in project implementation with various technologies, companies and projects emphases. I can assist you throughout the Software Development Life Cycle with an agile methodology, starting with an idea, mock up definition, User Interface/User Experience design and ending with product deployment.

I design the next generation of AI-first software systems. With over 20 years of experience—from early automation in the 2000s to today's agentic loops and multi-agent orchestration—I help businesses build reliable, scalable solutions that adapt to change. AI & Agents: Expertise in LLMs, agent harnesses, persistent agents (OpenClaw), and orchestration frameworks. Formal Design: Literate programming, Z, TLA+, Alloy—ensuring designs are precise and machine-understandable. Track Record: Ten years of five-star reviews on Upwork, leadership roles in startups, and systems that supported acquisitions. Tech Stack: Go, JavaScript, Python, C#, PHP, R, Postgres, Redis, RabbitMQ, SQLite, MongoDB. Deep experience with Linux and cloud platforms. I value long-term relationships and clear communication. If you're looking for someone who can combine visionary AI design with practical engineering, let's connect. ---- AI generated summary above, original below.. --- Like everyone, my primary focus in computing is artificial intelligence. Specifically, I have original ideas and designs for the new generation of software that must be built to replace everything we have right now. I started dabbling with LLMs when the original Github Copilot came out. In September of 2025, I realized we'd crossed a line where everything must become AI-first. In January of 2026, I went all in on agentic loops, mulit-agent orchestration, custom agent harnesses and exploring the whole world opened up by OpenClaw and other persistent agents with full ownership of their own machines. I wrote my first appilcations in the mid-90s and read my first books on JavaScript shortly after that. I built my first automation solutions in the early 2000s and now I have a track record of several systems that I designed which kept businesses running through pivots and into successful acquisitions. My lifelong obessession with sharing the hidden meaning in software lead me to use literate programming, formal methods, specification languages and concept design to describe software systems. And now I know the best languages (Z, TLA+, Alloy) for first exploring designs, and then making sure that the AI understands exactly what to build. I have over ten-years of five-star reviews on Upwork and I've held leadership positions in successful startups and profitable small businesses. Outside of software design, my professional interests range from music and video production to management consulting to copywriting. My amateur interests are too many and too insane to get into. The majority of my attention goes to my family, and in my professional life, I highly value the attention I get to put towards clients. My most valuable investments are in relationships. If you agree, then we can get on a call. My preferred languages, currently, for software construction are Go and JavaScript. This is with a coding agent like Claude or Codex dealing with all of the actual code. I've worked in tons of languages. My professional experience includes Python, JavaScript, C#, PHP, Perl, R and more niche languages I can't remember. I like to work with Postgres, Redis and RabbitMQ, but my favorite is SQLite for everything. And MongoDB is okay. I've worked extensively with cloud platforms, but since the early 2000's, my home is on Linux. Sometimes, people get their head way too far in the clouds. I saw this once with some people trying to run ElasticSearch. They kept putting their cloud in a cloud in a cloud and so on. I realized that we were already an AWS shop and we didn't need more cloud, and most important, all of our data was already tokenized, so we didn't need ElasticSearch because we already had a cloud, and we didn't need the actual Lucene tokenization engine because we already cleaned data (by the ETL team I hired and trained to use Spark, Hadoop and a custom functional/chainable text processing library I built to process the hacked databases). With the clean data all we needed was to implement an inverted index like Lucene, and I learned a lot about the cool data structures that Lucene uses, but it wasn't even necessary because I just used AWS Dynamo DB to hold the inverted index with pointers to documents on S3 and the first few hundred matching documents were streamed to the client within 500ms. So some cloud can be okay, but not too much cloud. The same might be true of AI, I don't know yet.

Experienced Perl Developer with strong expertise in backend development, automation scripting, database programming, and enterprise application support. I help businesses build reliable, scalable, and high-performance solutions using Perl, SQL, and PostgreSQL. I have hands-on experience in developing custom scripts, maintaining legacy Perl applications, database optimization, data processing, automation workflows, API integrations, and server-side programming for startups, SMBs, and enterprise clients. Whether you need a Perl script, backend system enhancement, PostgreSQL optimization, or automation solution, I can deliver clean, maintainable, and efficient code with quick turnaround. What I Can Help You With ⟷⟷⟷⟷⟷⟷⟷⟷⟷ ✔ Custom Perl Scripts ✔ Automation & Batch Processing ✔ PostgreSQL Database Development ✔ SQL Query Optimization ✔ API Development & Integration ✔ Legacy Perl Application Support ✔ Data Extraction & Transformation ✔ System Maintenance & Debugging ✔ Performance Tuning ✔ Scheduled Jobs & Monitoring Scripts Core Expertise ⟷⟷⟷⟷⟷ ✔ Perl Programming & Development ✔ Perl Scripting & Automation ✔ CGI & Backend Development ✔ SQL Query Development ✔ PostgreSQL Database Design & Optimization ✔ Database Migration & ETL ✔ REST API Integration ✔ Linux Shell Scripting ✔ Cron Jobs & Task Automation ✔ Data Processing & Reporting ✔ Legacy Application Maintenance ✔ Bug Fixing & Performance Optimization ✔ JSON, XML, CSV Processing ✔ Git Version Control Why Hire Me ⟷⟷⟷⟷⟷ ✔ Clean and optimized code ✔ Strong debugging skills ✔ Fast communication ✔ On-time delivery ✔ Long-term support ✔ Enterprise application experience ✔ Flexible engagement models Technical Skills ⟷⟷⟷⟷⟷ Perl, Python, PostgreSQL, SQL, PL/pgSQL, Bash/Shell Scripting, Linux/Unix, Apache, REST APIs, JSON/XML, Git/GitHub, Docker (Basic), Python (Supportive Scripting) Projects Delivered ⟷⟷⟷⟷⟷⟷ ✔ Enterprise Perl Automation System Developed Perl-based automation scripts for processing large-scale business data, generating reports, and scheduling background jobs with PostgreSQL integration. ✔ PostgreSQL Performance Optimization Optimized complex SQL queries and database structures for improved reporting speed and application performance. ✔ Legacy Perl Application Support Maintained and upgraded legacy Perl applications, fixed bugs, improved security, and added new modules/features for business continuity. ✔ API Integration & Data Processing Built Perl scripts for REST API integrations, CSV/XML/JSON processing, and automated synchronization between systems. Let’s discuss your project requirements and build efficient, scalable solutions together.

👨‍💻 𝗚𝗿𝗲𝗲𝘁𝗶𝗻𝗴𝘀! I’m Arthur, a full-stack developer with 𝟮𝟬 𝘆𝗲𝗮𝗿𝘀 𝗼𝗳 𝗲𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲 in backend and frontend development. Specializing in the ✔️ .NET framework and ✔️ Angular, I deliver customized, strategic solutions tailored to your business needs. [𝗘𝗫𝗖𝗟𝗨𝗦𝗜𝗩𝗘 𝗢𝗙𝗙𝗘𝗥𝗜𝗡𝗚𝗦] 𝗝𝘂𝘀𝘁 𝗳𝗼𝗿 𝗬𝗼𝘂! 🚀 Backend Development: Architecting robust server-side solutions that form the backbone of efficient business operations. 🚀 Frontend Development: Crafting sleek, user-centric interfaces that captivate and engage your audience. 🚀 Full-Stack Development: Integrating front and backend technologies into seamless, dynamic web applications. 🚀 Advanced Database Management: Optimizing data integrity and performance with top-tier security measures. 🚀 Strategic Problem Solving: Tackling complex technical challenges to ensure your systems remain smooth and scalable. [𝗪𝗛𝗔𝗧 𝗜 𝗖𝗔𝗡 𝗗𝗘𝗩𝗘𝗟𝗢𝗣] ✔️ Custom management systems: Enhance your business efficiency with tailored CRM, ERP, and SCM applications. ✔️ E-commerce platforms: Implement sophisticated payment and inventory functionalities for your online business. ✔️ Dynamic Web Applications: Deliver responsive and engaging web experiences to your users. ✔️ Employee Management Systems (HRM): Efficiently manage employee data and payroll with reliable solutions. ✔️ Advanced data analysis tools: Empower your business decisions with comprehensive analytics. ✔️ Seamless API Integration: Boost your system’s connectivity with robust third-party integrations. ✔️ Startup MVPs: Quickly transform your startup ideas into tested, viable products. ✔️ Customized Backend Environments: Design scalable and complex operational environments tailored to your needs. [𝗠𝗬 𝗧𝗘𝗖𝗛𝗡𝗢𝗟𝗢𝗚𝗬 𝗦𝗧𝗔𝗖𝗞] ✔️Languages & Frameworks: Mastery of .NET technologies including C#, Entity Framework, LINQ, ASP.NET WebAPI, and Angular essentials like TypeScript, RxJS,NgRx. ✔️Databases: Proficient in MS SQL Server, PostgreSQL, SQLite. ✔️Development Tools: Skilled in Visual Studio and Visual Studio Code, Git and GitHub, BitBucket, Azure DevOps, Team City. ✔️Design Principles: Deep understanding of SOLID and OOP design principles. On my latest projects I also used Domain Driven Design approaches. [𝗛𝗢𝗪 𝗪𝗘 𝗖𝗔𝗡 𝗦𝗧𝗔𝗥𝗧] 1️⃣ Share Your Idea: Tell me about your project. 2️⃣ Create a Plan: I develop a strategy tailored to your needs. 3️⃣ Agree on Details: We finalize the project requirements. 4️⃣ Sign Contract: We formalize our agreement on Upwork. 5️⃣ Start Project: I begin working on your ideas. 🌟 Ready to get started? Click the ✅ 'INVITE TO JOB' button and let's bring your vision to life! 🤝

I am a detail-oriented Perl developer with a strong background in backend development, scripting, and automation. Adept at building, maintaining, and optimizing complex software solutions using Perl and related technologies. I will develop dynamic, data-driven web applications using Perl, HTML/CSS, JavaScript, and PostgreSQL while designing scalable architectures for high-traffic websites with Perl frameworks like Dancer and Mojolicious. As a Perl developer, I have crafted and deployed robust Perl scripts to automate critical tasks such as system monitoring, log analysis, and data backup, streamlining processes and reducing manual intervention. I have efficiently handled large-scale data extraction and transformation projects, leveraging Perl’s powerful capabilities to enhance data processing and minimize workload. I have upgraded existing Perl applications by implementing new features and performance enhancements, driven by client feedback, to ensure scalable, high-performing solutions that meet evolving business needs. 𝐌𝐲 𝐂𝐨𝐫𝐞 𝐂𝐨𝐦𝐩𝐞𝐭𝐞𝐧𝐜𝐢𝐞𝐬: ⟷⟷⟷⟷⟷⟷⟷⟷ ✔Expert in Perl programming, including object-oriented Perl (OOP) ✔Advanced knowledge of regular expressions and text processing ✔Proficient in automation and scripting for system administration and data manipulation ✔Experience with web frameworks like dancer, mojolicious, and catalyst ✔Skilled in database management and integration using DBI, DBIx::Class, MySQL, PostgreSQL, and SQLite ✔Knowledge of API development (RESTful, SOAP) and integration 𝐌𝐲 𝐓𝐞𝐜𝐡𝐧𝐨𝐥𝐨𝐠𝐢𝐞𝐬 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞: ⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷ ✔Languages: Perl, Python, Shell Scripting, JavaScript, SQL ✔Frameworks/Libraries: dancer, mojolicious, catalyst, mood ✔Databases: MySQL, PostgreSQL, SQLite, Oracle DB ✔Tools: Git, SVN, Docker, Jenkins, Apache/Nginx, AWS (EC2, S3) ✔Operating Systems: Linux/Unix, Windows How do we communicate and report? ⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷ According to the requirement, we use many types of project management tools for the Magento development project's communication. ⦿ Upwork Message Board ⦿ JIRA ⦿ Azure DevOps Server ⦿ Asana ⦿ Trello ⦿ Zoho Projects

20+ experience in IT, Linux servers, MySQL, networking, building & maintaining distributed systems

Very skilled Unix system administrator, with lot of experience in Linux ( Centos, Redhat, Fedora, Ubuntu, Debian, Gentoo, Slackware ), Solaris, xBSD ( FreeBSD, OpenBSD), vpn ( openswan - ipsec, openvpn, l2tp, pptp ), clustering ( LInux Virtual Server, Linux HA, vrrp, Solaris Cluster ), cloud computing, load balancing ( f5, haproxy ), VoIP ( asterisk ), databases ( MySQL, PostgreSQL), LDAP, web services ( Apache, Nginx, varnish ), security ( penetration testing, firewall policy design ), control panels ( CPanel, Plesk, Virtualmin, Ensim ), Virtualization ( VMWare Virtual infrastructure - VSphere, amazon EC2, KVM ), cleaning infected servers with malicious code, Anti spam solutions with ASSP ( Anti Spam SMTP Proxy ), amavis - clamav, spamassassin, mail services (Postfix,exim,qmail,Zimbra), versioning ( git, gitlab, etckeeper ), IDS ( snort, ossec ), Performance optimization and not limited to those above only, willing to expand my knowledge base to new horizons. As for Developing I am very experienced in C, PHP, Perl and many more to list.