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Senior Full-Stack Developer | Web & Mobile Platforms, Automation & Complex Integrations Full-stack developer based in Greece with over two decades of experience building web applications, digital platforms, and custom software solutions for agencies, startups, and organisations worldwide. Available for long-term collaborations, agency partnerships, and complex technical projects. I’ve collaborated with international digital agencies, private companies, and teams delivering solutions for governmental and defense-related projects, working in environments where reliability, security, and professionalism are essential. I am also a tech conference speaker and open-source contributor, including contributions to WordPress core, reflecting my long-term commitment to the development community and software quality standards. My focus is on translating complex requirements into stable, scalable systems. I don’t just build websites — I design and develop solutions that improve processes, automate workflows, and support long-term business growth. What I Can Help You With • Full-stack web application development • System architecture & technical consulting • Custom platforms and SaaS-style products • API development & third-party integrations • Automation systems and testing infrastructure • CMS & eCommerce solutions • Performance optimization & scalability • Cloud deployments & infrastructure • Mobile and hybrid applications Technical Approach I’m technology-agnostic and comfortable working across different stacks and system architectures. Over the years, I’ve designed and delivered solutions using a wide range of frontend frameworks, backend technologies, CMS platforms, and cloud environments, selecting the most appropriate approach based on performance, scalability, security, and long-term maintainability rather than being tied to a specific technology. Experience Includes • Large-scale web platforms • Custom automation and QA systems • Advanced CMS extensions and plugins • Reporting dashboards and internal tools • Mobile applications connected to cloud backends • Complex integrations across multiple systems What Clients Appreciate ✔ Deep experience and practical problem-solving ✔ Clean, maintainable, production-ready code ✔ Strong communication and reliability ✔ Ability to handle complex or undefined requirements ✔ Long-term technical thinking I’m comfortable collaborating with distributed teams or leading development independently from concept to deployment. If you’re looking for a developer who combines experience, technical depth, and business understanding, I’d be happy to discuss your project.

I build intelligent, high-performance mobile and web applications integrated with AI to automate processes, enhance user experiences, and deliver measurable business growth. Whether you're launching a new AI-powered app from scratch or modernizing an existing codebase with smart features, I help businesses overcome common challenges: scope creep, endless revisions, delayed launches, and technical debt. My proven, structured processhoned through experience at Google and Appleensures efficient delivery, high-quality results, and lets you focus on marketing, go-to-market strategy, and scaling your business while I handle the tech. My Transparent, Client-Centric Development Process: - For Existing Codebases (Revamps, Upgrades, AI Integrations): I start with a thorough code review to understand your current architecture, strengths, and pain points. We then discuss your specific challenges and goals in detail. Next, I present a clear improvement plan with timelines, priorities, and expected outcomes. Once approved, I execute efficiently with regular updatesdelivering faster, cleaner, and more scalable solutions. - For Projects from Scratch (New Mobile/Web/AI Apps): First, I deeply understand your vision and requirements through targeted questions and research if needed. I then create interactive prototypes (UI/UX wireframes or clickable demos) to visualize the product early. After your approval and feedback, I map out all user journeys and flows for complete clarity. Only then do we move to full implementationensuring no surprises. Every milestone delivery includes a detailed QA report showing how it was rigorously tested for functionality, performance, security, and edge cases. This battle-tested approach minimizes risks, accelerates time-to-market, and has consistently helped clients launch polished products in significantly less timefreeing them to prioritize growth and strategy. What You Get: Cross-platform mobile apps (Flutter/React Native/iOS/Android) with AI features like chatbots, personalization, predictive analytics, or computer vision. Full-stack web applications (React/Next.js + Node.js/Python + databases) enhanced with LLMs (OpenAI, Gemini, etc.) and custom automations. Seamless AI integrations and workflow automations that save hours and boost efficiency. Clean, maintainable code, CI/CD, cloud deployment (AWS/GCP/Firebase), and ongoing support. Clients choose me for reliable communication, fast prototypes, and results that drive retention and revenue. Ready to build or upgrade your AI-powered mobile/web solution the right way? Message me with your idea or current codebase detailslet's discuss how we can deliver exactly what you need, on time and with zero headaches.

Need a developer who actually delivers instead of sending excuses and half-done work? You’re in the right place. I’m a full-stack web and mobile app developer with 9+ years of real project experience, helping businesses and startups turn ideas into working products in 3–5 days for most projects. I don’t outsource blindly or disappear mid-project. You deal with me, and you get results. What I Do Best: - Websites & Web Apps - Android App Development - API Integrations - Full-Stack Development - Website Performance Optimization - Security & Malware Cleanup - SEO & Page Speed - UI/UX Design Tech Stack: React Native, React.js Node.js, Laravel, PHP WordPress, JavaScript Android (Java) MySQL, MongoDB Firebase, REST APIs Why Clients Choose Me: ✔ Verified by Freelancer Staff ✔ Certified Web Developer ✔ Strong IT Educational Background ✔ 9+ Years Experience ✔ 100% Job Completion Rate ✔ Secure Source Code Handling ✔ Fast & Clear Communication ✔ Unlimited Revisions ✔ After-Delivery Support ✔ Available 24/7 If you want cheap, unreliable shortcuts, I’m not your guy. If you want clean code, fast delivery, and zero drama, let’s work.

Hi, I’m Stephen (Essell)👋 I design embedded IoT devices and gateways across both hardware and firmware — from system architecture, schematics, and PCB design through MCU integration, bring-up, debugging, and power optimization. My strongest work is where electronics and firmware need to line up properly: low-power sensors, LTE/BLE/LoRaWAN devices, ESP32-based systems, gateways, and custom embedded boards intended for real deployment rather than one-off demos. I bring 28 years of communications and integration experience into modern embedded products. I’m most useful on projects where the hard part is getting power, wireless behavior, firmware, and real-world constraints to line up properly — not just producing code or a PCB in isolation. I work with proper bench equipment for bring-up and validation, so debugging is based on measurements rather than guesswork. Typical work includes: • IoT sensors and gateways • PCB design and hardware bring-up • MCU firmware in C/C++ • LTE, BLE, Wi-Fi, LoRaWAN, MQTT • Low-power and battery-operated devices • Debugging, refinement, and rescue of troubled prototypes If you need someone who can take responsibility across the embedded side of the product, I’d be glad to discuss the project 🚀

Phantom Interactive provides DevOps and AWS assistance flow utilizing industry proven tools to customers who needs to automate and scale their services. We can assist with release management, infrastructure management, build and deploy pipelines, containerization and orchestration. From managing a development to designing and building infrastructure and CICD pipelines, we can make the difference in a successful project or not. Core skills and capability in our arsenal: - AWS infrastructure and services - CICD automation - Agile coaching, DevOps practices - Containerized workloads, EKS, ECS, native K8s and Docker workload - Blockchain and Crypto expertise, automated trading and analysis - AI implementations, ChatGPT modelling

MMS(systems) professional with passionate experience as a consultant for marketing plan, business plan, branding and previous experience in handling enterprise software sales, business development, account management, channel sales in information technology domain Core Competencies Strategic Planning Consulting Sales Competitive Analysis Market Research customer Experience Digital Analytics Channel Sales Leadership &Training Account Management Strategic Alliances P&L Management Marketing Strategy etc.

SACESTA TECHNOLOGIES: ENTERPRISE DIGITAL SOLUTIONS Portfolio: portfolio.sacesta.com | Virtual Visit: visit.sacesta.com Sacesta Technologies transforms ambitious ideas into scalable, sophisticated digital products. We partner with founders, startups, agencies, and enterprises to architect, design, and deploy modern web apps, mobile experiences, SaaS platforms, and AI-powered systems. Led by a former Apple and Amazon engineer, Sacesta brings enterprise-grade rigor and big-tech product discipline to every engagement, the same standards behind products trusted by hundreds of millions of users, now applied to your business. Our philosophy: turn ideas into vision, and vision into working products. Great software isn't just beautiful. It solves real problems, automates workflows, saves time, and drives sustainable growth. Core Capabilities Full-Stack Web Development: responsive sites and portals with dashboards, secure payments, real-time features Mobile App Development: native and cross-platform iOS/Android apps built for engagement AI Solutions & Automation: custom AI workflows that cut operational friction CRM & ERP Architecture: bespoke systems that centralize data and automate reporting E-Commerce Marketplaces: high-conversion platforms built for scale API Integration & Cloud Engineering: secure deployments on AWS, Azure, GCP with ongoing support THE SACESTA WAY 1. Discovery & Strategy We unpack your goals, users, and technical constraints, then translate them into a precise roadmap. Scope, timeline, and success metrics are defined before any code is written. 2. UI/UX Design We design with intent, not decoration. We map user journeys and reduce friction to create interfaces that convert visitors into loyal customers. 3. Scalable Development Built on modern, battle-tested tech stacks chosen for your use case. Clean, modular, well-documented code that grows with your product without costly rework. 4. Quality Assurance Multi-tier QA, including functional testing, cross-device compatibility, security audits, and performance benchmarking, happens before anything goes live. 5. Deployment & Support We handle secure, zero-downtime cloud deployment (AWS, Azure, GCP), followed by proactive monitoring and maintenance, keeping your product fast, secure, and ready to scale. At Sacesta, clean design, strong engineering, and transparent communication drive every project, along with your long-term success.

Im a PMP® certified IT Project Manager (PMI, 2025) with 15+ years of experience leading and delivering complex software and IoT projects. I also founded and led a tech startup, where I was directly responsible for product strategy, technical governance, budgeting, and team coordination. I help companies turn ideas into structured, delivered products, managing everything from planning to execution with a strong focus on timelines, budget, and real outcomes. Unlike pure project managers, I have a solid technical background, so I can effectively bridge business and development teams and step in hands-on when needed.