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Kostiantyn R.
$35/hr
100% Job Success
$50K+ earned
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Kostiantyn R. has worked .
I am a web developer with 10+ years of experience and a Master's degree in Software Engineering. I specialize in building custom web calculators, forms, and interactive web applications that help businesses generate leads, automate calculations, and improve user engagement. I have worked on a wide range of projects, from simple calculators to complex logic-based tools with API integrations, dynamic data processing, and CRM connections. What I can do for you: Build custom web calculators (finance, pricing, ROI, etc.) Create multi-step forms and quizzes with logic Integrate calculators with APIs, Google Sheets, or CRMs Embed solutions into any website Optimize performance and user experience Tech stack: JavaScript, jQuery PHP, MySQL HTML5, CSS3 AJAX WordPress, OpenCart Yii2 I focus on clean, reliable solutions and clear communication. Most of my projects are delivered as ready-to-use tools that can be easily integrated into your website.
$55/hr
100% Job Success
$7K+ earned
Offers consultations
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I help startups, SMEs, and operationally complex businesses modernize how they run — through AI automation, intelligent workflows, and engineered systems built for scale. My focus is operational transformation: replacing manual, fragmented processes with integrated, AI-driven systems that compound efficiency over time. I work with founders, operators, and agency leaders who need execution that thinks beyond code — combining engineering depth with a clear understanding of how businesses actually function. Where I focus: — AI Workflow Automation & Business Process Automation Designing AI-powered automations across CRMs, internal tools, and operational stacks. Built with n8n, Make, Zapier, and custom Node/Python services. Outcomes typically measured in hours reclaimed per week and manual errors eliminated. — AI Agents, LLM Integrations & Intelligent Systems Production-grade AI agents and integrations — RAG pipelines, tool-use, retrieval, evaluation, and guardrails. Built on OpenAI, Anthropic Claude, LangChain, and vector databases. Architected to behave reliably, not just demo well. — Internal Tools, Dashboards & Operational Software Custom admin panels, operational dashboards, internal CRMs, and team-facing systems that consolidate fragmented SaaS stacks into one well-engineered platform. — Modern Full-Stack Engineering Production web applications and SaaS systems engineered for scalability and long-term maintainability. Next.js, React, Node, Python, TypeScript, PostgreSQL, Supabase, AWS. How I work: Every engagement starts with a short discovery, a clearly scoped approach, and defined outcomes — not a feature list. I work in structured phases with regular checkpoints, deliver documentation as part of every build, and offer optional retainer arrangements for ongoing iteration after handover. Best fit for businesses that view software and automation as operational infrastructure, not one-off tasks. Engagements range from focused 2–3 week builds to multi-month transformation projects and ongoing technical partnerships. If you're scaling operations, adopting AI seriously, or rebuilding how your business runs — send a short brief. I'll respond with a scoped approach and any questions needed to quote accurately. Best regards, Muhammad Ans Co Founder & Team Lead | Innovaxel
innovaxel
Associated with
innovaxel
$1K+
earned
$49/hr
100% Job Success
$100K+ earned
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I help startups and growth-stage companies design, build, and scale AI-native software products — from early MVPs to production-grade agentic systems. My focus is modern AI infrastructure, compound AI systems, and scalable product engineering across web, backend, cloud, and multimodal workflows. Core Expertise • AI Systems Engineering * Multi-agent and compound AI systems * Agent orchestration, tool-use pipelines, and autonomous workflows * Model Context Protocol (MCP) integrations and AI tool ecosystems * Skills-based agent architectures and dynamic capability routing * Long-context memory systems and persistent agent state management * Structured generation pipelines and deterministic AI workflows • LLM Infrastructure & Reliability * LLM observability, tracing, monitoring, and debugging * LLM evaluations (evals), benchmarking, and regression testing * Prompt engineering systems and model routing strategies * Inference optimization, caching, latency reduction, and cost control * Open-source model deployment and fine-tuning * Hybrid architectures combining frontier and local models • AI Product Development * AI copilots, research agents, and workflow automation * Enterprise knowledge systems and retrieval pipelines * Voice, OCR, multimodal, and document intelligence platforms * Recommendation engines, semantic search, and reasoning systems • Full-Stack Engineering * React, Next.js, TypeScript, Node.js, Python * Real-time applications, APIs, SaaS platforms, and internal tooling * Scalable backend systems and distributed architectures • Cloud & Infrastructure * AWS, GCP, Azure * Kubernetes, Docker, serverless infrastructure, CI/CD * GPU orchestration and scalable AI deployment pipelines * Event-driven and microservices architectures • Data & Knowledge Systems * PostgreSQL, MongoDB, vector databases, graph databases * Knowledge graphs and semantic indexing systems * Data pipelines, ETL workflows, and analytics infrastructure • Security, Governance & Enterprise Readiness * Secure AI system design and access control * SOC 2 and ISO 27001–aligned infrastructure and engineering practices * HIPAA-aware healthcare AI systems and sensitive data workflows * AI governance, auditability, observability, and enterprise deployment readiness What I Bring • Founder-level ownership and product thinking • Strong execution across both strategy and implementation • Ability to move rapidly from concept → MVP → scalable platform • Experience building AI systems that operate reliably in production • Clear communication with technical and non-technical stakeholders Best Fit • Founders building AI-native products • Startups needing a technical co-founder or founding engineer • Companies integrating AI into core workflows or operations • Teams needing senior technical leadership for modern AI systems Available for: CTO roles, technical co-founder opportunities, AI systems architecture, agentic workflow development, and full-stack engineering leadership. If you're building ambitious AI products or infrastructure, let's talk.
Marta N.
$35/hr
100% Job Success
$10K+ earned
Available now
Offers consultations
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As an AI Agent Developer and AI Engineer, I ship production AI agents, RAG pipelines, AI automation, and Claude Code integrations for enterprise SaaS and financial services teams. My AI agents run 24/7 with observability, evals, and guardrails. 🏆 Top Rated, 100% JSS across every AI Agent Developer engagement 📊 $10K+ earned, 100+ AI Agent, RAG, AI Automation, and LLM engagements 🎯 AI Agent Developer, AI Assistant Development, RAG pipelines, AI Automation, Claude Code integrations ⚡ Part of Althera Code — an AI engineering team focused on production AI Agents, not demo pilots 💼 AI SDR Assistant in production, Microsoft Copilot + Claude integration shipped, Enterprise Multi-Agent Workflow MVP delivered ⭐⭐⭐⭐⭐ "Marta and her team are a strong AI full-stack and AI integration partner — delivering production-ready AI systems deeply integrated into our workflows." — AI SDR Assistant client, 2026 7+ years across Python and LLM systems, focused for the last 18 months on AI Agent Developer work, RAG pipelines, AI Automation, and Claude Code integrations into real business workflows. ━━━━━━━━━━━━━━━━━━━━━ WHAT I BUILD ▸ AI Agent Developer — Multi-Agent Orchestration on LangGraph & LangChain Production AI Agent architecture on LangGraph, LangChain, AutoGen, CrewAI, SmolAgents. MCP servers connecting AI Agents to live business systems. Evals, regression tests, LLMOps so the AI Agent holds up under real traffic. ▸ RAG Developer — Enterprise RAG & GraphRAG Pipelines RAG design, vector DB config (Pinecone, Weaviate, FAISS, ChromaDB), embeddings, chunking, reranking, citation grounding. GraphRAG on Neo4j. Multimodal RAG with OCR. ▸ Claude Code & AI Dev Tooling AI Developer using Claude Code + MCP for engineering workflows — scoped CLAUDE.md, sandbox-branch rollout, test-gated merges. Also Cursor, Windsurf, Bolt for AI-assisted development. AI Automation across Claude Code and MCP servers. ▸ AI Assistant Development — Chatbots, Copilots & Conversational AI AI Assistant Developer building AI Chatbots, AI Copilots, Conversational AI on Claude, OpenAI, Gemini, open-source LLMs. RAG document Q&A, Microsoft Copilot integrations. Cuts tier-1 tickets 70-80%. ▸ AI Automation & AI Integration — n8n, Claude Code, MCP & APIs Connecting AI Agents to CRM, ERP, SaaS, databases via REST API, webhooks, LangChain, MCP, n8n, Zapier, Make. ▸ AI Voice Agent Development AI Voice Agents on LiveKit, VAPI, Twilio — tool-calling, appointment booking, latency tuning, production evals. ▸ LLM Fine-Tuning Fine-tuning Llama, Qwen, Phi, DeepSeek with LoRA/QLoRA for domain-specific AI Agent behavior. Eval harness, adapter hot-swap. ▸ AI Engineer & Fractional AI Consultant — Architecture & Advisory AI Agent roadmap, architecture review, LLM/RAG stack selection, build-vs-buy scoping. ━━━━━━━━━━━━━━━━━━━━━ WHO I WORK WITH 🎯 SaaS and enterprise teams building AI Agents, AI Assistants, AI Automation — not one-off pilots 🎯 Fintech, healthcare, manufacturing, regulated verticals with real data and real stakes 🎯 Funded startups moving an AI Agent MVP into production 🎯 Clients on retainer or T&M who value senior AI Agent Developer judgment ━━━━━━━━━━━━━━━━━━━━━ MY PROCESS 1️⃣ Discovery — your AI Agent or RAG use case, current stack, production needs 2️⃣ Architecture proposal — AI Agent flow, tool boundaries, fallback, eval plan, delivered in a week 3️⃣ Build and ship — production-grade AI Agent with evals, regression tests, LLMOps 4️⃣ Handoff or stay — train your team, or stay on as Fractional AI Consultant ━━━━━━━━━━━━━━━━━━━━━ DELIVERY NUMBERS 75% avg reduction in manual ops · 3x faster feature shipping · 80% tier-1 support automated by AI Assistants ━━━━━━━━━━━━━━━━━━━━━ CORE TECH STACK LLMs: OpenAI (GPT-4o, o1), Claude, Gemini, Llama, Qwen 2.5, DeepSeek, Mistral, Whisper, LoRA/QLoRA AI Agents: LangChain, LangGraph, LlamaIndex, AutoGen, CrewAI, SmolAgents, MCP, Multi-Agent, Agentic AI AI Dev Tools: Claude Code, Cursor, Windsurf, Bolt, MCP servers RAG: Pinecone, Weaviate, FAISS, ChromaDB, Neo4j, GraphRAG, LightRAG, Embeddings, Reranking Voice: LiveKit, VAPI, Twilio, WebRTC, Deepgram, ElevenLabs, PaddleOCR LLMOps: FastAPI, LangSmith, Langfuse, evals, observability, guardrails, prompt versioning AI Automation: n8n, Zapier, Make, REST API, webhooks, Microsoft Copilot, GitHub Actions Full Stack: Python, TypeScript, React, Node.js, .NET, PostgreSQL, MongoDB, AWS/GCP/Azure ━━━━━━━━━━━━━━━━━━━━━ INDUSTRIES Manufacturing | Construction | SaaS | Fintech | Healthcare | E-commerce | Real Estate | HR Tech 📩 Send me your current workflow. I will tell you within 24 hours where AI Automation and AI Agents can remove the most manual work and what it would take to build it.
Althera Code
Associated with
Althera Code
$10K+
earned
Harsh K.
$25/hr
100% Job Success
Offers consultations
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Harsh K. has worked .
♛ 𝐓𝐎𝐏-𝐑𝐀𝐓𝐄𝐃 𝐏𝐋𝐔𝐒 🥇 𝐌𝐢𝐜𝐫𝐨𝐬𝐨𝐟𝐭 𝐂𝐞𝐫𝐭𝐢𝐟𝐢𝐞𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 🥇 𝟏𝟎𝟎% 𝐉𝐨𝐛 𝐒𝐮𝐜𝐜𝐞𝐬𝐬 🕐 𝟏𝟔,𝟎𝟎𝟎+ 𝐔𝐩𝐰𝐨𝐫𝐤 𝐇𝐨𝐮𝐫𝐬 | 🏆 𝟏𝟎𝟎+ 𝐂𝐥𝐢𝐞𝐧𝐭𝐬 𝐖𝐨𝐫𝐥𝐝𝐰𝐢𝐝𝐞 | ⭐ 𝟓-𝐒𝐭𝐚𝐫 𝐑𝐚𝐭𝐢𝐧𝐠𝐬 & 𝐑𝐞𝐯𝐢𝐞𝐰𝐬 ✔️ 𝟏𝟒+ 𝐘𝐞𝐚𝐫𝐬 𝐨𝐟 𝐇𝐚𝐧𝐝𝐬-𝐨𝐧 𝐄𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞 I am a Senior Full-Stack Developer specializing in building AI-powered SaaS products, AI Voice Agents, Voice/VoIP platforms, IoT and device integrations, communication systems, and complex business applications. I work with startups, SMEs, and enterprises to build products from scratch, take over existing applications, modernize legacy systems, integrate AI, and bring products to production. 🤖 𝐀𝐈 / 𝐋𝐋𝐌 / 𝐀𝐈 𝐀𝐠𝐞𝐧𝐭𝐬 ✔️ AI SaaS Platforms ✔️ AI Agents & Agentic Workflows ✔️ AI Voice Agents ✔️ AI Chatbots & Conversational AI ✔️ OpenAI / GPT / LLM Integrations ✔️ RAG / LangChain ✔️ AI-powered Search & Knowledge Systems ✔️ AI + CRM / ERP Automation ✔️ AI MVP Development ✔️ Cursor, Claude Code, Windsurf & GitHub Copilot ☎️ 𝐕𝐨𝐢𝐜𝐞 / 𝐕𝐨𝐈𝐏 / 𝐓𝐞𝐥𝐞𝐩𝐡𝐨𝐧𝐲 ✔️ Twilio Voice & Messaging ✔️ Asterisk ✔️ VAPI ✔️ Retell ✔️ LiveKit ✔️ SIP / WebRTC ✔️ IVR & Call Flows ✔️ Voice/Softphone Applications ✔️ Call Center Platforms ✔️ Call Routing & Queue Management ✔️ TTS / STT ✔️ Call Recording & Transcription 🚀 𝐅𝐮𝐥𝐥-𝐒𝐭𝐚𝐜𝐤 & 𝐒𝐚𝐚𝐒 ✔️ React / Next.js ✔️ Angular / Svelte ✔️ TypeScript / JavaScript ✔️ Redux ✔️ Node.js / Express / NestJS ✔️ Python / FastAPI ✔️ C# / ASP.NET Core / .NET ✔️ REST APIs / GraphQL ✔️ PostgreSQL / SQL Server / MySQL ✔️ MongoDB / Cosmos DB / NoSQL 🌐 𝐈𝐨𝐓 & 𝐃𝐞𝐯𝐢𝐜𝐞 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧𝐬 ✔️ IoT Device Integration & Communication ✔️ Real-time Device Data & Monitoring ✔️ Device-to-Cloud Integrations ✔️ REST / MQTT-based Integrations ✔️ Industrial & Connected Device Workflows ✔️ Real-time Dashboards & Alerts ✔️ Cloud Backend Integration for IoT Devices 🏗️ 𝐏𝐫𝐨𝐝𝐮𝐜𝐭𝐬 𝐈 𝐁𝐮𝐢𝐥𝐝 ✔️ Multi-tenant SaaS Platforms ✔️ AI SaaS & MVPs ✔️ CRM / ERP Systems ✔️ Marketplaces ✔️ Communication & VoIP Platforms ✔️ Healthcare Applications ✔️ Fintech & Payment Systems ✔️ Customer & Admin Portals ✔️ Internal Business Applications ✔️ Dashboards & Analytics Platforms ✔️ Legacy Application Migration & Modernization ☁️ 𝐂𝐥𝐨𝐮𝐝 / 𝐃𝐞𝐯𝐎𝐩𝐬 ✔️ Azure / AWS ✔️ Azure Functions / Service Bus / Event Hub ✔️ Azure SQL / Cosmos DB ✔️ Azure AD / Entra ID ✔️ Key Vault / App Insights ✔️ Azure DevOps & CI/CD ✔️ GitHub Actions ✔️ Docker / Kubernetes ✔️ Vercel / Cloudflare 🔗 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧𝐬 ✔️ Stripe / PayPal / Braintree / NMI / WorldPay / SagePay ✔️ HubSpot / GoHighLevel ✔️ Twilio ✔️ Microsoft Graph ✔️ Payment, CRM, ERP and third-party APIs 𝐖𝐡𝐲 𝐜𝐥𝐢𝐞𝐧𝐭𝐬 𝐰𝐨𝐫𝐤 𝐰𝐢𝐭𝐡 𝐦𝐞 I don't just write code from a specification. I can understand an existing system, identify technical risks, make practical architecture decisions, build features, integrate third-party services, test the solution, and take it through production. I am equally comfortable starting an MVP from scratch or taking over an existing codebase and improving it without unnecessarily rewriting working functionality. I have worked as a senior developer/technical lead with remote teams for more than 6 years and regularly work directly with founders, CTOs, product owners, and engineering teams. Industries: Healthcare • Fintech • SaaS • E-commerce • Telecommunications • AI • CRM • Business Automation • Marketplaces If you need someone to build an AI SaaS product, develop a voice/telephony platform, integrate complex APIs, modernize an existing application, or take a product from MVP to production, I would be happy to discuss it. Available 40 hours/week | Ready to start ASAP 𝐇𝐚𝐫𝐬𝐡
GrootNet Software Solutions Pvt. Limited
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GrootNet Software Solutions Pvt. Limited
Humair Ali K.
$27/hr
100% Job Success
$800K+ earned
Available now
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Humair Ali K. has worked .
🚀 AI-powered custom web systems, SaaS, ECommerce & AI workflows developer with 1,900+ projects and 27,000+ Upwork hours. I build, launch and continuously improve web systems, ECommerce, SaaS applications, AI integrations, automation workflows, APIs and custom business systems for founders and agencies. ⭐ 1,900+ projects delivered over 15 years 🏆 27,000+ Upwork hours | 100% Job Success | Top Rated 🌎 Worked with General Motors, SAP, Novartis, Telenor, L'Oréal and Garnier ⚡ Response under 1 hour during your business day I don't just build and disappear. Many of my strongest client relationships continue long after the first project - with ongoing development, new features, integrations, optimization, maintenance, AI implementation and technical problem-solving. 🔄 LONG-TERM DEVELOPMENT PARTNERSHIPS Many clients don't need a developer for one project. They need someone who can stay with the product and keep improving it. I work with founders, agencies and growing businesses on ongoing engagements covering: → New feature development → Product improvements → WordPress and Shopify development → SaaS development → AI integration and AI agents → API integrations → Business automation → Performance optimization → Security and technical maintenance → Bug fixing and technical troubleshooting → Third-party integrations → Technical SEO and Core Web Vitals → Migration and modernization Because I already understand your codebase, infrastructure, business logic and goals, future work can move faster with less onboarding and less management. Engagements can range from ongoing monthly development to dedicated development capacity for agencies and growing products. 👤 FOR FOUNDERS You need more than someone who can complete a development task. You need a technical partner who understands your product, your users and your business well enough to keep improving it as you grow. I can take your project from Figma, requirements, spreadsheet or rough idea to production, then stay involved for ongoing development, maintenance, integrations, automation, performance improvements and new features. You don't need to hire and manage an entire technical team for every stage of your product. I can work as your ongoing development partner, giving you experienced technical capability without the overhead of a full-time engineering team. 🤝 FOR AGENCIES I can be the build team behind your studio. I provide white-label WordPress, Shopify, React, Next.js, SaaS, AI and automation development, with NDA available on request. Your brand stays on the work, your client never needs to know I exist, and you can take on projects without constantly sourcing and managing new developers. More importantly, I can become a reliable extension of your team. You can send work continuously, keep the same technical partner across multiple client projects, and avoid repeatedly explaining your development standards, processes and expectations to new freelancers. I can work from your designs, specifications or client requirements and fit into your existing delivery process. 🛠️ WHAT I BUILD 🤖 AI Integration and AI Agents AI assistants, intelligent search, lead qualification, knowledge-base and document retrieval, content generation, LLM integrations, AI-powered workflows and agentic systems. SaaS and Custom Software MVPs, customer portals, business dashboards, workflow applications, calculators, configurators and internal systems designed around specific business requirements. WordPress and WooCommerce Custom WordPress development, WooCommerce stores, custom post types, ACF Pro, membership and subscription systems, multilingual websites, custom business logic, third-party integrations and performance optimization. This is not template assembly. I build WordPress systems around the actual business requirements. Shopify Custom Shopify stores, Shopify theme development, Liquid customization, app integrations, Shopify Plus and conversion-focused eCommerce experiences. React, Next.js and MERN Modern web applications, SaaS products, dashboards, client portals, marketplaces, booking platforms, internal tools and custom business applications. I focus on building products that can continue evolving rather than creating an MVP that needs to be thrown away at version two.
Amish M.
$40/hr
100% Job Success
Available now
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Amish M. has worked .
I design and build production-grade software for Fortune 500 enterprises and venture-backed startups from blank page to deployed. Multi-tenant SaaS, AI-powered products, and the developer tools infrastructure companies run on. 15+ years of Hands on Experience. WHY LONG-TERM WORKS BETTER Handing a codebase to a new contractor every quarter is how products rot. Context gets lost, architecture drifts, and each new person rebuilds instead of extends. When I stay, decisions compound. I know why the schema looks like that, which shortcut we took under deadline, and what breaks if you change it. DESIGN AND ENGINEERING, ONE PERSON Most teams hire a designer, then a developer, then spend three weeks translating between them. I do both, which removes that gap. I run discovery, map user flows, design in Figma, build the design system, then implement it myself in React and Next.js. Nothing is lost in handoff because there is no handoff. Nothing gets designed that can't be built. For founders without a design team, you get from idea to a real product without hiring twice. For teams that already have designers, you get someone who implements their work to spec instead of approximating it. I design for outcomes, not for dribbble onboarding flows that finish, pricing pages that convert, dashboards people can read under pressure. WHERE I USUALLY COME IN → An idea and no designs yet — discovery through wireframes and UI into a working product. → An MVP from scratch — scoped and scalable rather than overbuilt. → Scaling a product with traction — it works, but architecture is now the constraint. → Rescuing an unstable platform — the previous team left and it breaks in production. → A redesign or modernization — it works, but looks a decade old and converts like it. → Adding AI — RAG, agents, workflows, ai automations or LLM features integrated without destabilizing what works. Past Experiences: One of the largest Web3 node infrastructure providers in the world developer-facing product surfaces used daily by thousands of engineers building on-chain. A venture-backed cloud deployment platform product interface, Frontend App and marketing site, Docs and Guides etc designed and built end to end. A real estate analytics platform for multifamily operators data-heavy dashboards where the hard problem was hierarchy, not decoration. An enterprise smart-stadium platform large-scale venue operations frontend under real reliability constraints. WHAT I DESIGN AND ARCHITECT Product discovery, user flows, wireframes through high-fidelity UI. Design systems that stay consistent past the first release instead of fragmenting into forty button variants. Multi-tenant SaaS with real tenant isolation. Data models that survive scale. RAG pipelines that return grounded answers instead of confident nonsense. Cloud infrastructure sized to your stage and budget. Observability before the incident, not after it. HOW I WORK I'm Founder and CTO of StellarStack, so I've lived with my own architecture decisions for years, not weeks. I start with the business goal, not the ticket what you're measuring, your real constraints, and what this system looks like in eighteen months. That produces a plan with scope, milestones and rollout, instead of a stream of commits. I build it so your team could own it: typed end to end, documented, no dependency on me. Then I usually stay anyway, because most clients would rather keep shipping than manage a handover. If you need more capacity than one person, my team at StellarStack scales up around the work. I'll also tell you when the thing you asked for isn't the thing you need. If a two-week feature won't move your metric, I'd rather say so in week one. STACK Design: Figma, Adobe Suite(xd,photoshop,premier,xd),design systems, prototyping, accessibility, CRO Frontend: React, Next.js, TypeScript, Tailwind, shadcn/ui, Astro, Vue/Nuxt, React Native Backend: Node.js, NestJS, Python, FastAPI, PostgreSQL, MongoDB, Redis, Prisma AI: OpenAI, Anthropic, LangChain, RAG, pgvector, Pinecone Cloud: AWS, Serverless, Vercel, Azure , Google Cloud Platform, Docker, GitHub Actions, Cloudflare CMS: Sanity, Contentful, Storyblok Domains: AI SaaS · Dev Tools & Infrastructure · B2B SaaS · FinTech · PropTech · Enterprise · Marketplaces GOOD FIT IF You have real users or real funding and want someone who owns outcomes, not tickets. I work solo, embed with your team, or lead the developers on it accountable either way for how it looks, how it works, and whether it holds up in production. PROBABLY NOT A FIT IF You need WordPress edits, or you're shopping for the lowest rate on the platform, or the scope is "an app like Uber" on a $2k budget. NEXT STEP Tell me what you're building and where it's stuck, and let's get a call booked to talk it through single project or ongoing partnership, same invitation. First conversation is on me, and you'll get a straight answer on whether I'm the right person before you spend anything.
Jawad R.
$30/hr
100% Job Success
Available now
Offers consultations
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I am a full-stack developer with a strong backend focus, working mostly in ASP.NET Core, .NET, and C#. I build the backend (secure REST APIs, business logic, databases on Azure), the frontend in React and TypeScript, and mobile apps in Flutter for iOS and Android. So whether you need full stack development from scratch, backend development on an existing system, an ASP.NET Core API, or a Flutter mobile app, that's the core of what I do. I have been doing this for over 10 years, mostly for startups, SaaS companies, and businesses that have outgrown their first version of a product. Some hire me as a backend developer to build something new. Others have an app that works but has gotten slow, messy, or hard to change, and they need someone to take it seriously. I have shipped across a lot of industries: SaaS, fintech, healthcare, payroll, property management, booking platforms, field service, and enterprise software. That range matters more than it sounds. Payment logic, compliance, real-time data, and messy third-party integrations show up everywhere, and having solved them in one industry makes me faster in the next. Healthcare is one area I know deeply. I'm HIPAA and Privacy Law certified through the University of Pennsylvania and have built EHR and EMR systems, patient portals, EVV apps, and telehealth features, where security and compliance have to be designed in from day one, not bolted on at the end. I bring that same discipline to fintech and any product handling sensitive data. How I Work : Before I write code, I want to understand your business and your users. That usually means I ask a lot of questions. It also means I'll tell you honestly when something isn't worth building yet. I'd rather talk you out of a feature than watch you pay for something that won't move your business forward. That habit is why clients stay. One trusted me for over 1,700 hours, and plenty have come back for a second, third, and fourth project. The thing I care about most is that the software still makes sense a year later, when a different developer opens the code and needs to change something without spending a week figuring out how it all fits together. What I Do : Backend development: ASP.NET Core, .NET, C#, REST APIs, microservices, Entity Framework Core, JWT and OAuth, SignalR, third-party integrations Frontend: React, TypeScript, JavaScript, responsive web apps Mobile: Flutter for iOS and Android Cloud: Azure App Services, Azure Functions, Azure SQL, Docker, CI/CD Databases: SQL Server, PostgreSQL, MySQL AI: OpenAI and Claude integrations, AI assistants, document processing, workflow automation, chatbots A Few Things I Have Built : A multi-tenant SaaS platform on ASP.NET Core and Azure, from empty repo to paying users, including auth, billing integration, and an admin dashboard. A Flutter app for iOS and Android backed by a .NET Core API and PostgreSQL, with offline support and real-time sync so field staff could work without a signal and catch up later. A legacy .NET application that had become slow and fragile. I profiled the bottlenecks, restructured the database queries, and cut key page loads from several seconds to well under one, without a full rewrite. An AI document-processing workflow using the OpenAI and Claude APIs that pulled structured data out of messy PDFs and saved the team hours of manual entry every week. Different stacks, same approach: understand the problem, keep the code clean, and build something the next developer can actually maintain. How Working With Me Goes : I communicate in plain language, not jargon. I give you honest timelines and flag risks early instead of at the deadline. I show progress often so you're never guessing where things stand. If something is going to take longer or cost more than expected, you hear it from me before it happens, not after. What Clients Usually Hire Me For : Full stack development for a new SaaS platform or MVP Backend development on an existing ASP.NET Core app A secure REST API built in ASP.NET Core A React web app connected to a solid backend A Flutter mobile app with secure APIs and cloud infrastructure Modernizing a legacy .NET application Fixing a slow app or a slow database Moving to Azure Adding AI to a product without rebuilding it from scratch Availability : I take on both hourly and fixed-price projects, and I'm comfortable working solo or plugging into an existing team. I work in overlapping hours with US and European clients, so you get steady communication and quick replies during your day, not answers that land overnight. If you just need someone to type code, there are thousands of developers here. If you want a full stack developer who thinks about architecture, cost, and where your product is headed before touching the keyboard, we'll get along. Tell me what you're building, and I'll tell you honestly how I can help. If it's not something I'm the right fit for, I'll tell you that too.
Hoang Q.
$35/hr
100% Job Success
$60K+ earned
Available now
Offers consultations
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Hoang Q. has worked .
Backed by 100% Job Success over 60 projects, 𝐈 𝐨𝐟𝐟𝐞𝐫 𝐅𝐑𝐄𝐄 𝐭𝐞𝐜𝐡𝐧𝐢𝐜𝐚𝐥 𝐜𝐨𝐧𝐬𝐮𝐥𝐭𝐚𝐭𝐢𝐨𝐧 𝐚𝐧𝐝 𝐚 𝐅𝐑𝐄𝐄 𝐪𝐮𝐢𝐜𝐤 𝐫𝐞𝐯𝐢𝐞𝐰 𝐨𝐟 𝐲𝐨𝐮𝐫 𝐩𝐫𝐨𝐣𝐞𝐜𝐭. AI Full stack Developer with 9+ years across Web3 & AI. I build production agents that automate real workflows including RAG, multi-agent systems, trading & onchain automation, blockchain onchain data, Fintech, DeFi, RWA, Payment gateway. 🤖 AI agent work (what I ship now): - Custom AI agents & copilots - LangGraph, LangChain, CrewAI, OpenAI & Claude APIs - RAG pipelines grounded in your data - vector DBs, evaluation suites, guardrails against hallucination - Multi-agent orchestration - planner/worker/reviewer patterns, tool use, memory - Workflow automation - n8n, Slack/Telegram/WhatsApp bots, CRM & API integrations - Trading & onchain agents - bots that read markets, execute strategies, and interact with smart contracts safely ⛓️ Web3 foundation (9+ years): - DeFi protocols - lending, staking, perp DEXs, cross-chain (LayerZero, Axelar) - Smart contracts - Solidity, Rust, Foundry, audit-ready code - Wallets & infra - ERC-4337 account abstraction, MPC wallets, rollups (OP Stack, zkSync) Selected projects: - Multi-agent AI platform serving live users - Decentralized perpetual exchange - AI trading agent with onchain execution and risk limits - Liquity fork with multi-collateral DeFi architecture - RAG support agent resolving 60% of tickets automatically How I work: fixed scope, clear milestones, daily updates, full code ownership on delivery. I'll always recommend the smallest build that gets you a working agent in production — not the biggest. 📩 Send me the workflow you want automated (or the protocol you want built) and I'll reply with a concrete approach within an hours or book a 30-min consultation directly from this profile.
Hola Tech
Associated with
Hola Tech
$20K+
earned
Adnane R.
$70/hr
100% Job Success
$100K+ earned
Available now
Offers consultations
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I build the data systems behind marketing and operations decisions: tracking and attribution that actually reconciles, pipelines from your tools into BigQuery, and dashboards whose numbers hold up. Lately that includes AI agents: systems that read, decide, and act inside your stack, with a human in the loop where it matters. 80+ Upwork projects, 100% Job Success, Top Rated. Before freelancing full time I spent five years at a global IT services group, first running SAP production operations for a global beauty retailer, then automating those same processes with UiPath. That automation programme took the operations team from 21 technicians to 8. Most of my work is one of four things. Fixing broken tracking and attribution, so lead source and conversions match across your site, forms, CallRail, CRM and Google Ads. Consolidating scattered data into a BigQuery warehouse with clean reporting on top. Automating the manual reporting and data entry that eats your team's time. Or building an AI agent for a bounded job: reading and routing inbound email and documents, or turning your numbers into a written summary that explains what moved and why. What I build - AI agents (Claude, GPT): email and document triage that extracts, tags and routes; reporting agents that query your data and write the plain-language summary; built with human review where it matters - Marketing tracking & attribution: GA4, Google Tag Manager, Google Ads offline and enhanced conversions, Meta CAPI, GCLID capture, CallRail, CRM event mapping - BigQuery data warehouses: ingestion from GA4, Shopify, ad platforms and APIs, modeled with SQL (dbt/Dataform) into clean, documented tables - KPI dashboards in Looker Studio and Power BI (executive, marketing, finance, ops) - Workflow automations with n8n, Make and Zapier: data syncs, alerts, validations, email and attachment parsing - Automated Google Sheets and Excel systems (advanced formulas, Apps Script, VBA) - Internal tools for tracking, forecasting and analysis Tools & platforms - AI: Claude API, GPT, prompt design, LLM document parsing - BI: Looker Studio, Power BI - Warehouse & data: BigQuery, dbt/Dataform, REST APIs, webhooks, CSV pipelines - Automation: n8n, Make, Zapier, Google Apps Script, UiPath (enterprise RPA) - Spreadsheets: Google Sheets, Excel (advanced formulas, Apps Script, VBA) - Marketing & analytics: GA4, Google Tag Manager, Google Ads, Meta Ads, CallRail, Shopify, HubSpot - Other: Airtable, Softr, Smartsheet, Monday com Typical use cases - An agent that reads inbound emails and PDFs, pulls out the fields, and updates the CRM or sheet automatically - Fixing attribution so lead source, GCLIDs and conversions reconcile across web, forms, CallRail, CRM and Google Ads - Marketing performance dashboards: spend, CAC, ROAS, funnel, by channel - Financial tracking: revenue, margins, forecasts - Consolidating multiple sources into one warehouse and one source of truth - Replacing manual reporting with automated workflows How I work - Structured and detail-oriented - I work through written communication: clear specs, Looms and documentation - I build simple, maintainable solutions, not over-engineering - I document what I build so your team can run and extend it If you want someone to own the data side end to end, from raw inputs to reporting you can rely on, send me your setup and where it is breaking and I will tell you where I would start.