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Senior Full-Stack Developer with 10+ years building and shipping enterprise software directly alongside client teams. I specialize in embedding with customers, learning their real workflows fast, and building production-grade solutions that solve the actual problem, not just what was in the original spec. Comfortable owning a project end to end: requirements gathering, architecture, implementation, deployment, and iteration based on live customer feedback. I focus on rapid prototyping, custom system integration, and turning ambiguous business requirements into working software quickly, then hardening it for scale. Based in GMT+5:30, I regularly overlap with US and European working hours and am comfortable in daily standups, live pairing sessions, and async Slack-first workflows. ⚙️ Strong background in Agile delivery (Scrum, Hybrid, Agile) and cross-functional collaboration with architects, product managers, and non-technical stakeholders. 🤝 Comfortable working directly with clients: gathering requirements on the fly, demoing progress frequently, and adjusting direction based on real usage. ⭐ I care about clean, maintainable code and clear communication with the people relying on what I build. Key technologies: ✅ Java 8/11/15/17/21/25 ✅ Kotlin ✅ Python ✅ GoLang ✅ Spring Boot/Spring Cloud ✅ PostgreSQL / MySQL / MariaDB / Cassandra ✅ MongoDB / Redis ✅ Apache Kafka / RabbitMQ ✅ Keycloak / OAuth2 / Auth0 / AWS Cognito ✅ Maven / Gradle ✅ WebSocket / RSocket ✅ Docker / Podman ✅ Kubernetes ✅ Ansible ✅ Terraform ✅ CI/CD (GitLab CI, GitHub Actions) ✅ Shell Scripting ✅ RESTful APIs / GraphQL / RPC ✅ LLM / AI Agents / Claude Code Key Qualifications: ⭐ Fast onboarding into unfamiliar domains and codebases ⭐ Comfortable working directly with customer teams, not just internal engineering ⭐ Rapid prototyping and iteration under changing requirements ⭐ Microservices development with event-driven architecture ⭐ Self-starter who can operate with minimal supervision on ambiguous problems ⭐ Experienced leading small technical teams while remaining hands-on in the codebase ⚙ Requirements Analysis & Solution Design ✅ Led requirement analysis sessions directly with stakeholders, translating ambiguous business needs into clear, actionable technical objectives. ✅ Designed scalable backend architectures using Java and Spring Boot, building core application logic, services, and data layers aligned to real customer workflows. ✅ Defined RESTful API standards to ensure reliable integration between internal systems and client-side infrastructure. ⚙ Custom Integration & Enterprise Applications ✅ Built and maintained backend services designed to integrate with existing customer systems, including legacy infrastructure, ensuring high availability and fault tolerance. ✅ Used Spring Data JPA (Hibernate, MyBatis) and QueryDSL to build efficient data layers tailored to each client's data model. ⚙ Database Management & Optimization ✅ Designed relational and NoSQL schemas across MySQL, PostgreSQL, MongoDB, and Redis, matched to each project's specific data and scale requirements. ✅ Performed indexing, query optimization, and sharding to reduce latency in high-traffic, client-facing systems. ⭐ Deployment & Infrastructure ✅ Built and managed CI/CD pipelines (GitLab CI, GitHub Actions) for consistent delivery across dev, staging, and production, including client-hosted environments. ✅ Deployed containerized applications on Docker and Kubernetes, adapting to each customer's cloud environment (AWS, GCP, Azure). ⚙ Performance & Production Support ✅ Optimized systems for low latency and high throughput using Redis caching and efficient concurrency handling in Java. ✅ Built monitoring and alerting with Prometheus and Grafana, enabling fast troubleshooting directly with client teams during live incidents. ⚙️ Key Projects: ⭐ Embedded Backend for High-Traffic E-commerce Platform ✅ Built and scaled a transactional backend handling thousands of concurrent users with Java, Spring Boot, and PostgreSQL, working closely with the client's product team to prioritize fixes and features live. ⭐ Legacy-to-Microservices Migration ✅ Led migration of a monolithic system to microservices while embedded with the client's engineering team, using Kafka for event-driven, asynchronous communication. ⭐ Real-Time Analytics Dashboard ✅ Built backend services for a live analytics dashboard, iterating directly with end users to refine metrics and visualizations in real time. ⭐ AI-Powered Internal Tooling Deployment ✅ Embedded with a client team to design and deploy an LLM-backed internal tool, integrating it with existing data pipelines and iterating on prompts and workflows based on daily operator feedback.

I help companies design, automate, secure, and optimize cloud platforms on AWS, Azure, and GCP. With 8+ years of hands-on experience in Cloud, DevOps, Security, and Platform Engineering, I have led cloud transformation, infrastructure automation, Kubernetes modernization, FinOps initiatives, and enterprise security programs for Fortune 500 organizations and large-scale global environments. My expertise goes beyond infrastructure deployment—I focus on building scalable, secure, highly available, and cost-efficient platforms that accelerate software delivery while reducing operational overhead. I currently work as a Technical Lead responsible for cloud operations, platform engineering, security governance, automation, infrastructure modernization, cost optimization, and DevSecOps initiatives across multi-cloud environments. What I Can Help You With Cloud Architecture & Platform Engineering ✔ AWS Landing Zones & Multi-Account Architectures ✔ AWS Organizations & Control Tower ✔ Cloud Migration & Modernization ✔ High Availability & Disaster Recovery ✔ Hybrid Cloud & Multi-Cloud Architectures ✔ Platform Engineering & Internal Developer Platforms ✔ Infrastructure Standardization & Governance ✔ FinOps & Cloud Cost Optimization DevOps & CI/CD ✔ GitHub Actions ✔ GitLab CI/CD ✔ Jenkins ✔ AWS CodePipeline ✔ Bitbucket Pipelines ✔ ArgoCD ✔ Blue/Green Deployments ✔ Canary Releases ✔ Zero-Downtime Deployments ✔ Release Automation ✔ Environment Promotion Strategies Kubernetes & Container Platforms ✔ Amazon EKS ✔ Amazon ECS (EC2 & Fargate) ✔ Kubernetes Administration ✔ Cluster Upgrades & Modernization ✔ Helm ✔ Ingress Controllers ✔ Service Mesh ✔ Container Security ✔ Docker ✔ Container Registries (ECR, Docker Hub) ✔ Production Kubernetes Operations Infrastructure as Code & Automation ✔ Terraform ✔ OpenTofu ✔ CloudFormation ✔ Ansible ✔ Packer ✔ Python Automation ✔ Bash Scripting ✔ Infrastructure Lifecycle Management ✔ GitOps ✔ Self-Service Provisioning Platforms AI Infrastructure, MLOps & AIOps ✔ Amazon Bedrock ✔ Amazon Q ✔ OpenAI API Integrations ✔ AI-Powered DevOps Workflows ✔ LLM Infrastructure Deployment ✔ AI Agent Hosting Platforms ✔ Vector Databases ✔ RAG Infrastructure ✔ GPU Workloads ✔ Kubernetes for AI Platforms ✔ MLOps Pipelines ✔ AI Observability ✔ AIOps & Intelligent Incident Management ✔ AI-Assisted Infrastructure Automation Cloud Security & DevSecOps ✔ AWS Security Best Practices ✔ IAM Governance ✔ Identity Federation & SSO ✔ Security Baselines ✔ Secrets Management ✔ WAF & Edge Security ✔ Vulnerability Management ✔ Security Automation ✔ Compliance Automation ✔ SOC2 Readiness ✔ ISO 27001 Controls ✔ CIS Benchmark Implementations ✔ Cloud Security Reviews & Audits AWS Expertise ✔ EC2 ✔ ECS ✔ EKS ✔ Lambda ✔ API Gateway ✔ VPC ✔ Route 53 ✔ CloudFront ✔ ALB / NLB ✔ S3 ✔ RDS ✔ DynamoDB ✔ Aurora ✔ Elasticache ✔ Secrets Manager ✔ Systems Manager ✔ Control Tower ✔ Organizations ✔ Config ✔ CloudTrail ✔ GuardDuty ✔ Security Hub ✔ Compute Optimizer ✔ Cost Explorer ✔ Budgets ✔ Savings Plans & Reserved Instances Monitoring, Observability & Reliability Engineering ✔ CloudWatch ✔ Prometheus ✔ Grafana ✔ ELK Stack ✔ OpenSearch ✔ OpenTelemetry ✔ Distributed Tracing ✔ New Relic ✔ Datadog ✔ Dynatrace ✔ Incident Response ✔ SRE Practices ✔ Reliability Engineering ✔ Capacity Planning Certifications 🏆 AWS Certified Solutions Architect – Professional 🏆 AWS Certified DevOps Engineer – Professional 🏆 AWS Certified Security – Specialty 🏆 AWS Certified AI Practitioner 🏆 Google Cloud Associate Cloud Engineer Why Clients Work With Me ✅ Technical Lead with real enterprise-scale cloud experience ✅ Strong architecture and hands-on implementation skills ✅ Security-first mindset ✅ Deep AWS expertise ✅ Cost optimization and FinOps experience ✅ Fast troubleshooting and root-cause analysis ✅ Clear communication and documentation ✅ Visiting Lecturer in Cloud, DevOps, and Security ✅ AWS Community Contributor and Public Speaker Areas I Commonly Support AWS Infrastructure Design Terraform Projects Kubernetes / EKS ECS Fargate Cloud Security Reviews CI/CD Automation Cloud Cost Optimization Platform Engineering AI Infrastructure MLOps & AIOps DevSecOps Cloud Migrations Production Troubleshooting Observability & Monitoring

Hello! I’m Nadheera Senasinghe, a cybersecurity professional and AI security specialist with a proven record of protecting enterprise infrastructures, securing AI-powered applications, and leading digital transformation initiatives globally. As the Chief Project Manager and Co-founder of Red Threat Cyber Security (RTCS), I lead a team of expert ethical hackers, AI engineers, and compliance auditors delivering tailored cybersecurity and AI solutions for startups, healthcare providers, fintech platforms, SaaS companies, and regulated enterprises. 🔐 Cybersecurity Services Offered: • Penetration Testing & Ethical Hacking – Web, Mobile, API, IoT, and Network Pentesting – OWASP Top 10, SQLi, XSS, CSRF, RCE, RFI, and Serialization Attacks – Red Teaming, Adversary Emulation, and Purple Teaming – Pentesting for LLM/GPT apps (prompt injection, model exploitation) • Managed Security Services (MSSP) – SIEM (Splunk, Azure Sentinel, QRadar) & SOAR – 24/7 Threat Monitoring, EDR/XDR Deployment – SOC/NOC Architecture & Incident Response Playbooks • Cloud Security & DevSecOps – Cloud Audits (AWS, Azure, GCP), Zero Trust Design – Kubernetes & Docker Security, CI/CD Hardening – Infrastructure as Code (IaC) Reviews • Governance, Risk & Compliance – HIPAA, GDPR, ISO 27001, NIST CSF, SOC 2, PCI-DSS – Risk Assessments, DPIAs, Gap Analysis & Internal Audits • Threat Intelligence & OSINT – Corporate Recon, Espionage Risk Identification – Executive Profiling, Dark Web Monitoring • CISO-as-a-Service & Awareness Training – Virtual CISO Engagements – Custom Security Awareness Workshops 🤖 AI & GPT Integration Services: • LLM & GPT Security – Prompt Injection Prevention – Jailbreak Testing, Output Control – Secure API Wrapping & Audit Logging • Custom GPT Application Development – SEO GPT (w/ Moz API), Compliance GPT, Pentest GPT – Retrieval-Augmented Generation (RAG) Systems – Red Mallory: A proof-of-concept GPT demonstrating AI vulnerabilities (for research/awareness) • Secure AI Deployments – LLM System Design with Role-Based Access & Token Control – Data Leakage Protection for AI Systems – AI-driven Compliance Automation Tools 🎓 Certifications & Tools: • ISC² Systems Security Certified Practitioner (SSCP) • NIST CSF Practitioner | Google Project Management Certified • Tools: Burp Suite, Metasploit, Nessus, Nmap, Splunk, Nikto, IriusRisk, Wireshark, Threat Modeler, Microsoft TMT, DirBuster, OpenVAS 🌍 Client Locations & Industries Served: We’ve delivered successful projects in the USA, UK, UAE, Canada, Mexico, Belgium, Ghana, Hungary, and Latvia, serving sectors like: • Healthcare & HIPAA Platforms • Fintech & Payment Systems • SaaS & LLM-Based Startups • E-Commerce, Oil & Gas, Real Estate, and Public Sector Projects include HIPAA audits, fintech pentesting, red teaming for remote-first organizations, cloud security assessments, GPT app development, and cyber defense automation. 🚫 Please Note: I do NOT offer personal hacking, scam recovery, crypto wallet recovery, or any illegal services. 📩 Let’s Work Together! Whether you're building secure AI applications, improving your cyber defense posture, or seeking compliance-ready solutions—I bring hands-on leadership, global delivery experience, and technical excellence to every engagement. Let’s secure your digital future together.

I’m a Senior Software Engineer specializing in Full Stack Development, AI Engineering, and DevOps, with 5+ years of experience building and running production systems end to end. I help startups and businesses turn ideas into scalable, production-ready applications from frontend and backend development to AI integrations, cloud infrastructure, CI/CD, observability, and ongoing reliability. My core strength is connecting the pieces: building the application, integrating AI where it actually adds value, and making sure the whole system is reliable, observable, secure, and cost-efficient in production. What I can help you build Full Stack Development React, Next.js, TypeScript Node.js, NestJS, Express, FastAPI PostgreSQL, Redis, ClickHouse, Neo4j REST APIs, WebSockets, real-time applications Multi-tenant SaaS platforms Authentication, RBAC, payments, subscriptions and integrations AI & LLM Engineering OpenAI and Anthropic Claude integrations LLM-powered automation and data extraction Document and receipt processing Vision-based AI workflows Structured outputs and reliable parsing AI agents and backend workflows Prompt engineering and evaluation Token/cost optimization Retries, caching, rate-limit handling and observability I focus on building AI features that work beyond the demo with validation, structured outputs, fallbacks, monitoring, and sensible cost controls. My Tech Stack Languages: TypeScript, JavaScript, Go, Java, Python Frontend: React, Next.js, Tailwind CSS, Flutter Backend: Node.js, NestJS, Express, FastAPI, Spring Boot AI: OpenAI, Anthropic Claude, LLMs, Vision, structured outputs Databases: PostgreSQL, Redis, ClickHouse, Neo4j Cloud: AWS, Azure, GCP DevOps: Kubernetes, Docker, Terraform, Flux CD, GitHub Actions Observability: Prometheus, Grafana, OpenTelemetry, OpenObserve Integrations: Stripe, HubSpot, WebSockets, REST APIs Background First Class Honours in Computer Science & Engineering, University of Moratuwa Google Summer of Code 2022 5+ years of professional software engineering experience 100% Job Success Top Rated Seller Experience working with international clients and distributed teams I work independently, communicate clearly in plain English, and take ownership from architecture → development → deployment → production. If you need a senior engineer who can build the application, integrate AI, and handle the infrastructure required to run it reliably in production, let’s talk.

𝗕𝘂𝗶𝗹𝗱 | 𝗗𝗲𝗽𝗹𝗼𝘆 | 𝗦𝗰𝗮𝗹𝗲 You have a visionary SaaS or AI product idea. You don't want to manage a scattered team of backend developers, DevOps engineers, and ML specialists, and you definitely don't want to micromanage tasks. You need a single, accountable technical partner to architect the system, solve the hard problems, and turn your idea into a scalable reality. I’m a Computer Science grad (first-class), but I don't just live in the theory. I combine a heavy academic background in math, stats, and ML with fast, practical execution. I don't just write code. I take ownership of the whole project: the design, the architecture, and the infrastructure. 🧠 𝗛𝗼𝘄 𝗜 𝗔𝗽𝗽𝗿𝗼𝗮𝗰𝗵 𝗬𝗼𝘂𝗿 𝗦𝘆𝘀𝘁𝗲𝗺: When you hand me a prototype, an MVP, or even just a wireframe, my first step is mapping the architecture. I am a natural problem solver, so I look at the big picture first. I treat your product like a business asset and focus on the hard realities: 🔹 Can we launch the MVP faster to validate the market? 🔹 Does it do exactly what your users need? 🔹 Is the AWS bill optimized, or are we burning money? 🔹 Will it crash if traffic spikes tomorrow? 🔹 Is your proprietary data actually secure? 🔹 If a server dies, is the database instantly recoverable? 📈 𝗥𝗲𝗰𝗲𝗻𝘁 𝗪𝗶𝗻𝘀 & 𝗪𝗵𝗮𝘁 𝗜 𝗗𝗲𝗹𝗶𝘃𝗲𝗿: 🔹 𝗜𝗻𝗳𝗿𝗮𝘀𝘁𝗿𝘂𝗰𝘁𝘂𝗿𝗲 𝗦𝗰𝗮𝗹𝗶𝗻𝗴 & 𝗖𝗼𝘀𝘁 𝗢𝗽𝘁𝗶𝗺𝗶𝘇𝗮𝘁𝗶𝗼𝗻: Recently, completely re-architected a system to handle 𝟰𝟬𝘅 𝗰𝗼𝗻𝗰𝘂𝗿𝗿𝗲𝗻𝘁 𝗽𝗿𝗼𝗰𝗲𝘀𝘀𝗶𝗻𝗴 while achieving a 𝟳𝟬% 𝗰𝗼𝘀𝘁 𝗼𝗽𝘁𝗶𝗺𝗶𝘇𝗮𝘁𝗶𝗼𝗻 on cloud spending. 🔹 𝗔𝗜-𝗡𝗮𝘁𝗶𝘃𝗲 𝗦𝗮𝗮𝗦 𝗔𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲: I use my deep learning research experience to build secure, private LLM and RAG pipelines tailored to your business data. 🔹 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗲𝗱 𝗖𝗹𝗼𝘂𝗱 𝗜𝗻𝗳𝗿𝗮𝘀𝘁𝗿𝘂𝗰𝘁𝘂𝗿𝗲 (𝗗𝗲𝘃𝗢𝗽𝘀): I architect zero-downtime CI/CD pipelines and configure AWS/GCP environments so you can ship features fast. 🔹 𝗕𝘂𝗹𝗹𝗲𝘁𝗽𝗿𝗼𝗼𝗳 𝗕𝗮𝗰𝗸𝗲𝗻𝗱 𝗦𝘆𝘀𝘁𝗲𝗺𝘀: I engineer high-performance backends (Django, Node) that won't crash when your user base scales. 🤝𝗠𝘆 𝗪𝗼𝗿𝗸𝗶𝗻𝗴 𝗦𝘁𝘆𝗹𝗲: I work best with founders and small teams who need a leader. You bring the business problem and the priorities — what matters next and why. I own the rest: the architecture, how the work gets broken down, and the delivery. I run it in focused sprints against agreed goals, with async updates and a call when a real decision needs one — so you get momentum without daily standups eating your week. When you hire me, you are not buying hours of typing, or a developer to assign tickets to. You are buying the judgment, speed, and technical leadership required to win — and a clean, production-ready product handed back to you. Let's look at your system and get it running right.

6+ years building production Java and Angular systems, and now I run the whole thing with AI at my back. Not tutorials, not toy apps. The kind of systems companies actually run on and can't afford to break. FULL-STACK ENGINEERING • Java, Spring Boot, Spring Security, Spring Cloud, Hibernate/JPA • Angular, TypeScript, RxJS, modern responsive front-ends • Python (FastAPI), Node.js, PHP (CodeIgniter) • REST APIs, GraphQL, WebSockets, microservices architecture • Messaging & events: RabbitMQ, Apache Kafka, Azure Service Bus • Auth done right: OAuth 2.0, SSO, JWT, Azure AD • Databases: MySQL, MSSQL, PostgreSQL, MongoDB, Redis (design & optimization) • Testing: JUnit, integration & contract testing, OpenAPI/Swagger docs • DevOps: Linux, Docker, Kubernetes, CI/CD, Terraform (IaC) • Cloud: AWS, Azure, GCP AI-POWERED DEVELOPMENT (this is where I move fast) • Claude Code and Codex: I build with agents, not around them • Custom AI agents, chatbots and assistants • RAG systems and multi-LLM integration • n8n workflow automation • Document AI: PDFs, invoices, data extraction • AI wired into real backends, not demos BROWSER AUTOMATION AND ANTI-DETECT (Ex-Multilogin dev, I built the tooling from the inside) • Browser automation at scale: Selenium, Puppeteer, Playwright • Fingerprint and environment management for QA, ad verification, data work • Web scraping and data extraction • Browser fingerprinting HOW I ACTUALLY WORK • I think in systems, not tickets • I'll tell you when your idea has a hole in it before it costs you money • Code you won't pay someone to rewrite in three months • Fast replies, clear updates, delivered when I said it would be If you want someone to nod and build whatever you say, I'm probably not your guy. If you want someone who'll build it right and push back when it matters, let's talk.