Hire the Best Systems Engineer in Tampa, FL

𝐄𝐱𝐩𝐞𝐫𝐭-𝐕𝐞𝐭𝐭𝐞𝐝 (top 1% on Upwork) and 𝐓𝐨𝐩 𝐑𝐚𝐭𝐞𝐝 𝐏𝐥𝐮𝐬, with $𝟒𝟎𝟎𝐊+ earned across 𝟏𝟐𝟓+ projects. I'm a founder and full-stack engineer who acts as your technical partner, architecting AI and blockchain systems that work in production, not just in a demo. Most clients come to me when the build actually matters: when it has to be secure, has to scale, and has to handle real data or real money without breaking. I architect and build custom systems end to end, and I can bring in a vetted team when a project needs more hands. Think of me as a fractional CTO and a builder in one: senior judgment on the strategy, real hands on the code. A lot of AI talent stops at a clever prompt and a slick demo. I come at it as a systems engineer. I have architected a Layer 1 blockchain hardened with post-quantum cryptography, a decentralized exchange and validator platform, an on-chain tokenization system for commercial real estate, and production AI agents that run real sales and operations workflows. I work natively in fintech and regulated systems, so I'm as fluent in tokenomics, compliance, and data-heavy infrastructure as I am in the code itself. If your AI or your protocol has to be correct, not just impressive, that is the gap I fill. 𝐖𝐇𝐀𝐓 𝐈 𝐁𝐔𝐈𝐋𝐃 • AI agents and automation: multi-agent systems, LLM integration, RAG, and automation wired into your real tools and data • Custom full-stack software: React / Next.js, Node.js, Go, Rust, and databases, built and shipped end to end • Smart contracts and protocols (EVM and Solana): audited, gas-optimized, production-ready • DeFi and tokenization: staking, swaps, liquidity, governance, and real-world-asset / on-chain systems • AI for fintech and on-chain: the rare overlap of AI, blockchain, and financial systems, done by one person who understands all three • Technical strategy: architecture, security review, tokenomics, and the roadmap to get there 𝐖𝐇𝐘 𝐂𝐋𝐈𝐄𝐍𝐓𝐒 𝐇𝐈𝐑𝐄 𝐌𝐄 • 𝐄𝐱𝐩𝐞𝐫𝐭-𝐕𝐞𝐭𝐭𝐞𝐝 and 𝐓𝐨𝐩 𝐑𝐚𝐭𝐞𝐝 𝐏𝐥𝐮𝐬: roughly the top 1% of Upwork talent, with $𝟒𝟎𝟎𝐊+ earned and 𝟏𝟐𝟓+ projects delivered • A founder's perspective: senior judgment on strategy, with real hands on the code • Security and correctness first: audits, hardening, and systems trusted to move real value • Senior, direct communication and predictable, on-time delivery If you are building an AI product or a custom platform, automating real operations, launching a protocol, or tokenizing real-world assets, and you want a technical partner who will get it right the first time, let's talk.

Need senior IAM help without hiring a full-time architect? I’m an IAM Architect and Engineer with 15+ years of experience helping organizations design, troubleshoot, modernize, and support identity platforms. I work well on focused consulting engagements, part-time IAM support, architecture reviews, troubleshooting sessions, and hands-on implementation work. My core areas include Microsoft Entra ID, Azure AD B2C, AD FS, PingFederate, PingOne, PingAccess, PingID, DaVinci, Auth0, SAML, OAuth, OpenID Connect, WS-Fed, MFA, Conditional Access, SCIM, provisioning, hybrid identity, PowerShell, and REST API automation. I can help with: • Fixing broken SSO integrations • Setting up SAML, OAuth, or OIDC applications • Troubleshooting claims, tokens, certificates, metadata, redirect URIs, and login flows • Reviewing Entra ID, Azure AD B2C, AD FS, Ping, or Auth0 configurations • Supporting Azure AD B2C custom policies and user flows • Planning AD FS modernization or migration to Entra ID • Reviewing Conditional Access, MFA, break-glass accounts, and sign-in logs • Evaluating IAM, SSO, and authentication products • Creating IAM diagrams, implementation plans, and technical documentation • Providing part-time IAM engineering or architecture support Good fit projects include: • “Our SSO integration is broken and we need help fast” • “We need help with Entra ID, Azure AD B2C, AD FS, Ping, or Auth0” • “We need a senior IAM person for a few hours per week” • “We need someone to review Conditional Access or MFA configuration” • “We need IAM architecture guidance before making changes” • “We need training, documentation, or a second opinion on our identity setup” I’m comfortable jumping into messy identity environments, figuring out what is going on, and giving clear next steps. I can work hands-on, advise your internal team, or provide architecture guidance depending on what your project needs. If you need practical IAM help from someone who understands both enterprise architecture and the gritty integration details, I can help.

I'm Juan Sebastián Santamaria, a seasoned Lead Cloud Engineer with over 8 years of IT expertise. I bring a comprehensive skill set in network security, M365 administration, system and server management, as well as automation through PowerShell and Bash scripting. My certifications in AWS, Avaya, and VMware attest to my dedication to delivering secure and efficient solutions. With a Systems Engineering degree, I’m passionate about enhancing cloud infrastructure and optimizing IT operations to drive business success. 💼 Skills: ✅ Microsoft 365 Administration ✅ IT Support ✅ Cloud Solutions ✅ Technical Troubleshooting ✅ Security Management ✅ Automation and Scripting ✅ Collaboration Tools ✅ User Training and Support ✅ Project Management ✅ Data Migration ✅ Compliance and Reporting ✅ Integration and Configuration ✅Firewall and Security Configuration

Windows Azure, System Center 2016, 2012, administrator of Office 365, Windows Server 2016, 2012, 2008, Windows Server 2016,2012, 2008 Core Editions, Hyper V R2, System Center Virtual Machine Manager 2016, 2012, 2008 SCOM 2007 SCCM 2007 Design and implementation of cluster Hyper V, virtual machines, VMware ESX, Server Administration Windows 2000, 2003, 2008. Design, Implementation and Administration of Active Directory 2000, 2003 and 2008, Installation and Administration Exchange 2000, 2003, 2007, 2010, 2013, 2016. ISA management Server 2004 and 2006, management rules and internal network security. To lead projects to improve infrastructure with Quest Software tools, Pre-Sale Quest Software and BMC Software. Realization, planning and development of infrastructure projects, Domain Migration Windows 2000, 2003, 2008, Active Directory, Mail Servers Migrating Exchange 2000, 2003, 2007, 2010. Managing Virtual Machines and environments with VMware, hardware support and software at all levels, remote control tools SMS, PCAnywhere, VNC, management tools E-mail, Lotus Notes, Exchange, handling all Office tools in all versions, telephony administration and management, personnel management support, Backup management of network servers with ARCserve, Windows NT, Windows 2000, 2003, 2008, installation, management and control of servers and PC antivirus, Office scan, McAfee, Norton

Hi, I'm John. Most DTC brands run at 5 to 12% of revenue from email. A properly built Klaviyo account runs at 30 to 40%. On a $200K/month store, that gap is roughly $50K a month sitting in customers you already paid to acquire. I close that gap. No ad spend required. What I actually find when I audit an account: One SKU is doing 80 to 90% of revenue. Cross-sell is near zero. Repeat purchase rate is under 5%. Discounts are eating 40%+ of gross sales. On one recent build, the client's accessories were converting at 85 to 95% when featured in post-purchase email, and they weren't running post-purchase email at all. That revenue was already there. It just had no system pointing at it. What I build: → Full flow architecture: welcome, abandoned checkout, cart, browse, site abandonment, post-purchase cross-sell, replenishment, winback, back-in-stock, price drop, sunset, VIP → Post-purchase cross-sell engine mapped SKU by SKU from your actual Shopify purchase data. This is where the money usually is and it is the flow almost nobody builds properly. → Deliverability from the ground up: dedicated sending domain, SPF, DKIM, DMARC, list hygiene, sunset suppression, engagement scoring, Google Postmaster monitoring. I run a 6-week recovery protocol when an account is already burned. → Segmentation architecture: RFM tiers, engagement tiers, buyer vs non-buyer, product affinity. Sending to everyone is why your deliverability is bad and your revenue is flat. → Campaign calendars at 3 to 4 sends per week, planned around launches, inventory, and seasonality, with a discount-dependency reduction plan so margin goes up, not just revenue. → Custom-coded HTML email design. Not drag-and-drop templates. Klaviyo, Figma, Shopify, headless setups included. → Popup and on-site capture optimization, moving signup rates from the typical 2 to 4% into the 6 to 12% range. → Weekly revenue reporting with real attribution. Not open rates. How I de-risk this for you: Start with a paid audit as milestone one. I pull your Klaviyo and Shopify data and give you a full teardown: where the revenue is leaking, what it's worth, and the exact build order to capture it. You own that document whether or not you hire me for the build. If the plan doesn't convince you, we stop there and you're out one small milestone. Who this works for: Shopify DTC brands doing $50K+/month with at least 90 days of Klaviyo data and more than one SKU. If you're below that, email won't compound fast enough to be worth my rate and I'll tell you so. Send me your store URL and your current email revenue percentage. I'll tell you what the gap is worth before you spend a dollar.