🚀 Full Stack Developer | Python Expert | AI/LLM Integrator | 5+ Years Experience | FinOps | Real-time Systems Hi! I’m Rajajayaruban T, a results-driven Full Stack Developer with over 5 years of professional experience architecting and delivering scalable, high-performance web applications, SaaS platforms, and AI-powered analytics tools. I specialize in Python (Flask, FastAPI), JavaScript/TypeScript (React, Next.js, Node.js), and cloud infrastructure (AWS, Azure FinOps, Docker, Kubernetes). My work spans across sectors including enterprise FinOps, defense simulation, scheduling systems, and AI-based analytics dashboards. 💼 What I Do Best: AI-Powered Analytics: Integrated LLMs to enable natural language querying and dashboard generation from multi-database environments. FinOps Development: Built cloud cost optimization systems with ML-based recommendations for AWS, Azure, and Oracle Cloud. Real-Time Dispatch Systems: Architected timeline-based scheduling tools for defense and oil rig operations using CesiumJS and complex geo-routing logic. Multidimensional Scheduling Apps: Designed large-scale employee transport and vendor scheduling platforms handling thousands of users in real time. 🧠 Technical Stack: Languages/Frameworks: Python, Flask, FastAPI, JavaScript, TypeScript, Node.js, Express, React, Next.js, Redux Cloud & DevOps: AWS, Azure FinOps, Docker, Kubernetes, Git, CI/CD Databases: PostgreSQL, MySQL, MongoDB, Redis, ClickHouse, Cassandra AI/ML: Fine-tuning LLMs, Ollama, ML algorithms, Elasticsearch Others: WebSockets, JWT, OAuth, Superset, CesiumJS, GraphQL, REST APIs 🌟 Project Highlights: 🔹 Service Insight – AI Data Analytics Tool Lead Backend Developer Built an AI-powered platform enabling users to connect to any database and retrieve insights through natural language queries using fine-tuned LLMs and Apache Superset. 🔹 FinOps – Cloud Cost Optimization Platform Lead Backend Engineer Developed scalable data pipelines for analyzing multi-cloud infrastructure usage and provided actionable ML-based cost-saving insights. 🔹 Defense Simulation (UAE) Built Real-Time Simulation Tools Delivered a strategic planning simulation system with custom timeline management, terrain algorithms, and 3D map rendering for military use. 🔹 Rig Scheduling – Oil Rig Digital Twin Enterprise Scheduling & Optimization Created a high-scale scheduling system that included dispatch algorithms, terrain analysis, and visual optimization tools for rig operations. 🔹 VMRoutes – Employee Transport System (ETS) Full Stack Architect Developed web/mobile apps for multi-organization transport management using OR Tools for routing and real-time vendor allocation. 🏆 Why Choose Me: ✅ Proven leadership experience (Tech Lead, Senior System Engineer) ✅ Expert in both backend-heavy systems and frontend dashboards ✅ Focused on performance, scalability, and clean architecture ✅ Strong mentoring background – trained 12+ frontend developers ✅ Consistent growth – from PHP intern to AI project lead 📫 Let’s connect and build something amazing!

I’m a GIS developer who builds production-grade mapping apps: WebGIS maps, WMS/WFS overlays, PostGIS spatial APIs, and clean React dashboards. Top Rated • 100% Job Success • All 5★ reviews • $5K+ earned on Upwork I build fast WebGIS applications, interactive maps, spatial APIs, and geospatial dashboards that turn location data into clear workflows and decisions. WHAT YOU CAN HIRE ME FOR • WebGIS maps & dashboards: layers, filters, search, popups, clustering, heatmaps, choropleths, drawing tools • Full-stack GIS backend: PostGIS schema + spatial queries, GeoJSON/vector tiles, REST APIs (Django/Node), roles/auth • WMS/WFS + GIS services: GeoServer/ArcGIS integration, styling, caching/tiling, performance tuning • Data pipelines: Shapefile/GeoJSON/CSV ingestion, validation, CRS fixes, ETL automation • Fix & optimize: Mapbox/Leaflet bugs, slow rendering, large datasets, stability improvements TYPICAL PROJECTS Parcel/land viewers, planning portals, asset/utility maps, real estate map search, logistics dashboards, environmental monitoring. TECH STACK React/Next.js, JavaScript/TypeScript, Mapbox GL/MapLibre, Leaflet/OpenLayers, PostgreSQL + PostGIS, GeoServer, ArcGIS Online, QGIS, Python. HOW I WORK 1- Requirements + sample data → quick plan 2- MVP delivered fast (search + click-to-attributes + layers) 3- Iterate (filters, exports, analytics, roles, performance) 4- Clean handover (docs + deployment support) To start: send your AOI, sample dataset/layers, and the workflows you need (search/click/filter/export). If you already have a WebGIS app with bugs or performance issues, I can jump in and stabilize it quickly.

I help startups and SaaS companies build software that continues to scale as the product grows. I enjoy joining projects at the point where things stop being simple. Maybe your product has grown faster than expected. New features are getting harder to ship, technical debt is slowing the team down, or the architecture that worked for the first version is starting to show its limits. That's usually where I can help. For the past 12+ years, I've been helping teams turn ideas into production software - and, just as importantly, keep that software maintainable as the business evolves. I work across the entire stack, from modern frontend applications to backend architecture and infrastructure. But clients don't hire me because I know React, Laravel, Vue, or any other framework. They hire me because I can quickly understand a complex system, make sound technical decisions, and build solutions that other engineers can confidently extend months or years later. Over the last few years, AI has naturally become part of my work. I've integrated LLMs into existing SaaS platforms, built AI-powered features and internal tools, automated workflows, and used AI to speed up development without sacrificing engineering quality. I don't build AI for the sake of it - I use it when it solves a real problem and delivers measurable value. One thing clients often tell me is that they don't have to manage me. I communicate clearly, ask the right questions early, and take ownership of the work. If I see a simpler solution, I'll suggest it. If I think a decision is likely to become technical debt six months from now, I'll raise that concern before we write the code. Beyond web development, I also work with Rust and systems programming, including Solana smart contracts, SDK development, asynchronous programming with Tokio, concurrency, and performance-critical software. That experience has shaped the way I think about performance, reliability, and software architecture across every project I work on. Whether you're building a new SaaS product, scaling an existing platform, modernizing a legacy application, or adding AI capabilities to your product, I'd be happy to help. Technologies Languages: TypeScript, PHP, Rust Frontend: React, Next.js, Vue, Nuxt, Angular, NgRx, TanStack Query, Redux Toolkit, RTK Query, Pinia, Tailwind CSS, SSR, SSG, Hybrid Rendering Backend: Laravel (Octane, Horizon, Cashier, Sanctum), REST APIs, GraphQL, WebSockets, Queue-based & Event-driven Architecture, Node.js AI: OpenAI, Anthropic, LLM integrations, AI-powered features, AI workflows, MCP, Prompt Engineering, AI-assisted development, Claude Code, Codex, ChatGPT Databases & Infrastructure: PostgreSQL, MySQL, Redis, ClickHouse, Supabase, Docker, CI/CD Payments & SaaS: Stripe, Subscription Billing, Multi-tenant Architecture Blockchain & Systems: Solana, Rust, SDK Development, Tokio, Async Programming, Concurrency, Serialization Testing: PHPUnit, Vitest, React Testing Library

Howdy! I'm Mark Black, full stack software engineer. I have over five years of industry experience, including time as an engineer for Shopmonkey, Romph & Pou, and Valenz Health. I've worked on a wide variety of projects, leveraging my expertise both in software development and data engineering. I also work actively on independent projects, mostly using Go, Vue.js, and Python. I've also worked with PHP, Typescript, and a long list of different databases, SQL and NoSQL, such as PostgreSQL, Sqlite, MongoDB, and even OLAP data warehouses like ClickHouse. Got a software project you're looking to tackle, and need a dependable engineer with a track record of success? Let's get in touch!

I build things that ship — scalable SaaS platforms, AI-powered developer tools, and production-grade microservices. Currently Principal Software Engineer at OrgOrbit and an Ex-Founder, I combine the precision of a senior engineer with the ownership mindset of someone who has launched their own products from zero. ── FLAGSHIP OPEN-SOURCE WORK ── ogcode (120+ GitHub stars) is a full AI coding agent written in Go — it reads your codebase, collaboratively plans features, spins up isolated branch agents, writes code, and ships pull requests in parallel. It's the clearest expression of how I approach every engagement: systematic, automated where it counts, and focused on shipping. dblm is a natural-language CLI that lets engineers query Postgres, MySQL, SQLite, MongoDB, and ClickHouse in plain English — removing friction between intent and execution. intellectia (16 stars, 41 forks) is a TypeScript/React/MySQL platform that guards against misleading AI-generated content, with real community adoption worldwide. shipli-ai is an MCP-powered CLI that runs AI compliance audits on Flutter apps before App Store or Play Store submission — catching rejections before they happen. ── TECHNICAL DEPTH ── • Backend & Systems: Go, Node.js, TypeScript, Python — REST APIs, microservices, event-driven architecture • AI & LLM Engineering: AI agent pipelines, LLM tool use, MCP server development, autonomous coding workflows • Frontend: React, TypeScript — production SaaS dashboards • Mobile: Flutter/Dart — cross-platform, AI-integrated apps • Databases: PostgreSQL, MySQL, MongoDB, SQLite, ClickHouse, IndexedDB • DevOps: Docker, Docker Swarm, Docker Compose, Lerna monorepos ── I WRITE, SO I COMMUNICATE CLEARLY ── On dev.to I've published 11+ technical articles read by thousands — including a 6-part Docker Zero-to-Hero series (43 reactions on Part 1), Docker Swarm deep-dives, a Lerna/monorepo guide, and an LLM productivity piece on token-efficient workflows. If you've worked with engineers who can't explain their own decisions, you'll notice the difference immediately. ── WHAT I'VE SHIPPED ── Full-stack SaaS platforms, a Flutter CV builder, an AI social app, a LinkedIn data extractor, a promise-based IndexedDB npm package — across consumer products, developer tools, and enterprise platforms. ── WHY HIRE ME ── I ask the right questions early, flag trade-offs honestly, and deliver code the next engineer won't curse. I've been the founder who shipped alone and the principal engineer who reviewed everything — that range makes me a reliable partner for both early-stage builds and mature codebases. Let's build something real. Message me and we can scope it in one call.

Senior Platform Engineer with solid hands-on experience in designing, scaling, and securing cloud-native platforms, GPU-accelerated AI infrastructure, and Agentic AI workloads within highly regulated industries (finance, telcom, government). Deep expertise in architecting and operating large-scale Kubernetes clusters, implementing GitOps (Argo CD/Flux), Service Mesh and Infrastructure as Code (IaC) pipelines, hardening the Kubernetes software supply chain and enforcing robust zero-trust security posture across multi-cloud and on-premise environments. Key Qualifications: ● 10+ years architecting and automating multi-cloud (AWS/Azure/GCP) infrastructures via IaC (Terraform). Orchestrates large-scale Kubernetes clusters, GPU/HPC, and AI inference pipelines with zero-downtime migrations, multi-region scalability, and full auditability. ● Experience in building production Kubernetes Operators using Kubebuilder to automate complex application lifecycles, including self-healing, scaling, backups, and zero-downtime upgrades for AI/ML and multi-cloud workloads. ● Extensive experience enhancing security for Kubernetes clusters across AKS, EKS, GKE, and OpenShift. Proficient in leveraging Istio, Kyverno, OPA, Hubble, Falco, and Cilium Tetragon to implement robust security policies and controls. ● Expertise in building and scaling secure, GitOps-driven Agentic AI workloads and MCP-enabled Agentic Harness environments, delivering autonomous, context-aware multi-agent systems with declarative IaC, intelligent orchestration, secure tool integration, and reliable execution at enterprise scale. ● Built Agent Harness, an Agentic AI system using autonomous agents to detect, diagnose, and resolve common Kubernetes issues, achieving 40% faster automated resolution with built-in human-grade oversight ● Proven expertise in managing large-scale GPU clusters on Kubernetes, implementing advanced workload scheduling, and optimizing inference infrastructure for large-scale AI applications. ● Designed and operated high-performance inference clusters powered by H100 NVL, MI300X, and GB200 GPUs, achieving sub-180 ms P99 latency while serving over one million daily active users for Character.AI. * Extensive hands-on experience with the NVIDIA (TensorRT-LLM, Triton, vLLM, SGLang, MIG, GPUDirect, InfiniBand NDR/XDR) and AMD ROCm 6.x ecosystems within secure and regulated environments. ● Architected GitOps-first, zero-trust Kubernetes platforms leveraging ArgoCD, Cilium Tetragon, Kyverno, Istio Ambient, and Karpenter—powering frontier AI research labs and national laboratory workloads. ● Led the development of 01cloud, a cloud-agnostic PaaS built on Kubernetes to streamline deployment of cloud-native applications across managed and on-premises infrastructure. Automated large-scale GPU clusters for LLM training and inference with full multi-cloud portability. ● Developed custom Kubernetes Operators to automate containerized application lifecycle management, improving operational efficiency and reducing manual intervention. ● Over seven years of experience authoring Infrastructure-as-Code (IaC) using Terraform, and managing complex deployments via Terraform Enterprise, Pulumi, AWS CDK, and Chef. ● Enhanced Kubernetes cluster security across AKS, EKS, GKE, and OpenShift by implementing comprehensive policy enforcement and observability through Kyverno, OPA, Istio, Hubble, Falco, and Cilium Tetragon. ● Implemented Kubernetes Security Posture Management (KSPM) to ensure best-practice adherence, conduct vulnerability assessments, and maintain compliance with PCI, SOC2, HIPAA, NIST, and GDPR standards. ● Developed reactive, resilient, and message-driven microservices using Golang, Java, and Rust. Deployed distributed API gateway and networking workloads with Apigee, Kong, Ambassador, and Istio. ● Proficient in Spark, Kubeflow, and MLflow for large-scale data and ML pipeline orchestration. Experienced with distributed file systems (GlusterFS, Lustre, Ceph) and NoSQL/datastore technologies including HBase, Cassandra, Redis, MongoDB, Zookeeper, etcd, Confd, Elasticsearch, Kafka, and ClickHouse. ● Familiar with the modern Big Data ecosystem, including AWS EMR, Glue, Hadoop, Pig, Hive, Spark, Flink, and Airflow.

Hi, I'm a Full Stack Developer with 3+ years of experience building modern web applications, real-time monitoring systems, and AI-powered platforms. I specialize in JavaScript-based technologies including React.js, Next.js, Node.js, Express.js, and MySQL/PostgreSQL. I have experience developing scalable frontend and backend systems, integrating APIs, building analytics dashboards, and creating automation tools for business operations. Recently, I’ve been working on smart farming and analytics platforms, where I developed: • Real-time monitoring dashboards • AI-powered content and analytics features • Automation and data integration systems • Interactive and responsive web applications I focus on writing clean, maintainable code and delivering solutions that are fast, reliable, and user-friendly. Whether you need a full stack web application, backend API, dashboard system, or AI-integrated platform, I can help turn your ideas into a working product. Skills: • React.js • Next.js • Node.js & Express.js • TypeScript & JavaScript • MySQL & PostgreSQL • REST API Integration • Tailwind CSS • Real-time Systems • Automation Tools Feel free to contact me to discuss your project.

⭐️⭐️⭐️⭐️⭐️ 100% Job Success | Top Rated 8+ years as a full-stack engineer specializing in AI-powered applications and production SaaS platforms. 🌟 Highlights: Built production RAG systems and AI assistants for domain-specific use cases (legal, medical) Created a full Google Analytics alternative using ClickHouse + Cloudflare Creator of widely-used open-source JavaScript plugins End-to-end product builder: strategy, design, development, and growth 💡 Core Skills: AI Integration: LLMs, RAG pipelines, embeddings, vector databases, OpenAI/Vercel AI SDK Frontend Development: Next.js, React, TypeScript, Redux, Zustand UI/UX: Figma to pixel-perfect code, responsive layouts, accessibility Full-Stack: PostgreSQL, Supabase, Prisma, GraphQL, FastAPI Infrastructure: Docker, CI/CD, ClickHouse, Cloudflare, real-time data pipelines 🔍 What Sets Me Apart: I ship production systems, not prototypes Full product ownership, from database schema to UI polish Performance, reliability, and scalability are non-negotiable Clear communication, no hand-holding required 🌍 Most Recent Work: UserLoom io: Solo-building a complete product growth platform (design, dev, content) Law Firm AI Assistant: RAG-powered chatbot with domain-specific document retrieval Analytics Platform: Google Analytics alternative with real-time pipelines at scale 💼 Why Work With Me: Senior role credibility + solo founder execution speed I understand both the technical and business side Proven track record delivering AI and SaaS products end-to-end Ready to build something real? Let's talk. 🚀

Front-end Development: Frameworks & Libraries: Angular 2+, React (Next.js), Ionic Web Technologies: HTML, CSS, Tailwind CSS, JavaScript, jQuery UI Libraries & Frameworks: Bootstrap, React-Bootstrap, Material-UI, Angular Material, ngZorro, KendoUI, Syncfusion State Management: RxJS, NgRx, NGXS for large and small-scale applications Design Tools: Figma to UI Back-end Development: Technologies & Frameworks: Node.js, Express, EJS Databases: MongoDB Additional Skills: DevOps: Docker, NGINX, Continuous Integration/Continuous Deployment (CI/CD), AWS, Azure, Google Cloud Platform (GCP) API Integration: RESTful APIs, GraphQL, third-party API integration Security: Advanced security measures, OWASP best practices, JWT authentication, OAuth 2.0, SSL/TLS encryption Performance Optimization: Caching strategies, lazy loading, code splitting, performance monitoring Testing: Unit testing, integration testing, end-to-end testing with tools like Jest, Mocha, Chai, Cypress My extensive experience in front-end development with Angular, coupled with my proficiency in Node.js and MongoDB, allows me to deliver full-stack solutions that are both efficient and scalable. I have worked with RxJS, NgRx, and NGXS for state management in both large and small-scale applications, ensuring robust and maintainable code. I am adept at integrating third-party APIs and implementing advanced security measures to ensure the reliability and safety of the applications I develop. My DevOps skills, including Docker and NGINX, further enhance the deployment and maintenance of robust web applications.

I help startups and businesses design, build, and scale production-ready web and mobile applications. I’m a senior software engineer with 10+ years of professional experience, working across backend, frontend, and cloud infrastructure. My strength is building reliable, high-performance systems — from APIs and real-time services to analytics platforms and internal tools. I’m especially comfortable with complex backend logic, data-heavy applications, and performance-critical systems. I regularly work with: • Startups (idea → MVP → production) • Existing products that need refactoring, scaling, or optimization • Data-intensive systems (analytics, dashboards, event pipelines) What I can help you with: • Backend development (Node.js, Go, Python) • API design & system architecture • High-performance data systems (PostgreSQL, Redis, ClickHouse) • Web & mobile apps (React, React Native, modern UI stacks) • Real-time systems, background workers, and integrations • Cloud & DevOps (Docker, Kubernetes, GCP/AWS) I’m comfortable joining projects at any stage and adapting quickly to existing codebases or new tech stacks. I care about code quality, performance, and long-term maintainability, not just “making it work.” If you’re looking for a developer who can think like an engineer, communicate clearly, and take ownership, I’d be happy to help.