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I build infrastructure that stays up when it matters. Government platforms for 2M+ citizens, banking systems for 1M+ users, and AI rendering stacks on GPU Kubernetes clusters. Shipped on time, documented for the team that inherits it. 5+ years owning the full stack: physical hardware, hypervisors, Kubernetes, service mesh, cloud networking, CI/CD, observability, and GPU AI workloads. Across government, fintech, SaaS, and deep-tech startups. Government Scale — OpenG2P Ethiopia, 3 Ministries Leading platform engineering for Ethiopia's national OpenG2P welfare system across ATI, MoWSA, and EDRMC. Serving 2M+ beneficiaries on RKE2 with Rancher, Istio mTLS, Keycloak SSO, WireGuard site-to-site VPN, XCP-ng hypervisor with Hardware RAID 1+0, and a full Prometheus + Grafana + Alertmanager + Loki observability stack. Currently executing a large-scale ODK to OpenG2P data migration with schema mapping, validation pipelines, audit trails, and phased rollback. AWS Serverless Architecture — WeTruck Architect and operator of WeTruck's serverless logistics platform. CloudFront to ALB to WAF (deny-by-default with Telebirr payment gateway IP whitelisting) to Lambda (FastAPI via Mangum). Fully Terraformed infrastructure. GitHub Actions with OIDC federation (zero long-lived credentials), RDS PostgreSQL, DynamoDB for JWT token store, SQS with dead-letter queue, Secrets Manager, AWS Amplify for three Next.js frontends (back-office, transporter, shipper), and Route 53 private/public DNS. I own production incidents end-to-end and authored the full deployment runbook and troubleshooting playbook. AWS in daily use: Lambda, EC2, EKS, CloudFront, ALB, WAF, RDS, DynamoDB, SQS, Secrets Manager, Amplify, ECR, Route 53, IAM OIDC, VPC (private subnets, NAT Gateway, VPC endpoints), CloudWatch, ACM. MPLS and AI Rendering Infrastructure — MetaPlux (Tech Lead) Tech Lead on a distributed GPU-aware AI rendering platform. MPLS networks for deterministic, low-latency routing across distributed rendering nodes with label-switched paths and traffic engineering for QoS-sensitive GPU workload traffic. BGP and OSPF routing across hybrid environments connecting on-premises GPU clusters to cloud egress points. WireGuard VPN tunnels for secure, auditable connectivity. Multi-cloud strategy across AWS and Azure for rendering workload distribution. Platform architecture for GPU-aware Kubernetes scheduling and job orchestration. This role sits at the intersection of deep networking and modern cloud infrastructure, the combination most DevOps engineers don't have. AI and GPU Infrastructure — Exponent.ch (Switzerland) Provisioned and managed NVIDIA GPU-enabled RKE2 clusters running AI and automation workloads: n8n, Langfuse LLM observability, LibreChat, and ClickHouse analytics. Standardized Helm deployments across 5+ environments using shared-stacks architecture. Integrated Teleport for zero-trust cluster access, automated secrets via Lade and 1Password. Prometheus + Grafana + Mimir observability with 99.9% metric coverage, 60% MTTR reduction, and 3 critical outages prevented through proactive alerting. Banking Infrastructure — 6 Ethiopian Banks, 1M+ Users Delivered high-availability mobile banking and USSD platforms for Siinqee Bank, Hijra Bank, Wegagen Bank, and others with 99.95% uptime across 1M+ users. Designed MPLS network architecture for multi-branch WAN connectivity with QoS for transaction data. Built Jenkins CI/CD for Maven Java apps (4 hours to 15 minutes). ELK processing 10TB+ daily logs. Proxmox and AWS hybrid cloud with ~35% cost reduction. Full Technical Stack Container Orchestration: Kubernetes (RKE2, EKS, K3s), Docker, Helm, Rancher, OpenShift Infrastructure as Code: Terraform, Terragrunt, Ansible, OpenTofu CI/CD: GitHub Actions, GitLab CI, Jenkins Cloud: AWS (full suite), Azure, OpenStack Networking: MPLS, BGP, OSPF, WireGuard, HAProxy, NGINX, VLAN, VPC design Service Mesh: Istio (mTLS, traffic policies, ingress) Observability: Prometheus, Grafana, Mimir, Alertmanager, Loki, OpenTelemetry, ELK, Zabbix, SigNoz Security and Identity: Keycloak, HashiCorp Vault, Teleport, IAM OIDC Virtualization: Proxmox, XCP-ng, VMware AI and Automation: NVIDIA GPU Kubernetes, YOLO, ONNX, TensorRT, n8n, Langfuse, LibreChat, ClickHouse Databases: PostgreSQL, MySQL, MongoDB, Redis, Elasticsearch, DynamoDB Backend: Python (FastAPI), Bash, Node.js How I work I overcommunicate early, give realistic timelines, and ship verified, not "it should work." I treat testing as the real deliverable, not a checkbox. If something is out of scope or a bad idea, I'll tell you before you spend money on it. Message me if you need: - AWS or Kubernetes infrastructure built or fixed - CI/CD pipelines developers actually trust - GPU and AI infrastructure with inference pipelines and observability - Migration from cloud to cloud, or on-prem to production cloud - MPLS, BGP, or complex network architecture across hybrid environments - Observability that catches problems before users do

❇️ Senior Solution Architect & Full-Stack Engineering Leader | 🌍 16+ Years Experience | 🚀 100+ Global Projects Delivered I specialize in architecting and delivering high-performance, scalable, and intelligent software systems for startups, scale-ups, and enterprise clients worldwide. With over 16 years of hands-on experience, I operate across the full technology spectrum—combining modern frontend frameworks, robust backend architectures, and cloud-native infrastructure to transform complex ideas into production-grade applications. My core strength lies in designing end-to-end solutions—from rapid MVP development to large-scale enterprise platforms, with a strong focus on performance, scalability, and user-centric design. 🔷 Core Expertise ✔️ Enterprise Architecture & Full-Stack Leadership Designing scalable, maintainable systems across web, mobile, and cloud environments. ✔️ Frontend Engineering Excellence React.js, Next.js, Angular, TypeScript Modern UI systems (MUI, Bootstrap) High-performance, responsive, and interactive interfaces ✔️ Backend & API Architecture Node.js (Express, LoopBack), Java (Spring), Python (Django) REST & GraphQL (Apollo) APIs Distributed systems & microservices architecture ✔️ Geospatial & Advanced Mapping Systems CesiumJS (3D Globe), OpenLayers, ArcGIS, Google Maps, Mapbox Real-time geospatial data visualization and processing ✔️ Database & Data Engineering Relational: Oracle, PostgreSQL, MySQL, SQL Server NoSQL: MongoDB, Elasticsearch, AWS DynamoDB High-performance querying and data modeling 🔷 Cloud & DevOps Expertise ✔️ Cloud-Native Architecture AWS (Primary): Lambda, API Gateway, S3, Cognito, Kinesis, Athena CI/CD pipelines using CodePipeline, CodeBuild, CodeDeploy Elastic Beanstalk & serverless application deployment ✔️ Multi-Cloud Capabilities Google Cloud (App Engine, Compute Engine, Cloud Functions) Microsoft Azure (Pipelines, Boards, Repos) ✔️ Version Control & Collaboration GitHub, GitLab, Bitbucket, AWS CodeCommit, Azure Repos 🔷 Integrations & Enterprise Systems ✔️ API Integrations (Extensive Experience) PayPal, Stripe, Zoom, QuickBooks, Twilio, SendGrid, WhatsApp (Meta), Uber, Lyft, Zapier, Expensify, and more. ✔️ Authentication & Security (SSO / OAuth) Auth0, Okta, AWS Cognito, Firebase, Azure AD, and major social platforms. ✔️ CRM, ERP & CMS Systems Zoho, Odoo, Apache OFBiz, HippoCMS ✔️ Data Visualization & Reporting Power BI, Jasper, BIRT, Sisense, Highcharts, Recharts, Chart.js, AMCharts 🔷 Delivery Approach I bring a solution architect’s mindset to every engagement: 📌 Deep technical discovery & architecture planning ⚡ Agile, milestone-driven execution 📈 Scalable, future-ready system design 💬 Clear, consistent stakeholder communication I partner with organizations that require precision, scalability, and long-term reliability in their technology stack. If you’re looking for a senior architect who can lead, design, and deliver complex systems end-to-end, I bring the expertise and execution discipline to turn vision into reality. -- Nikhil Mahajan

When your backend is breaking under load, your microservices are drifting, or your APIs aren't talking to each other — I'm the engineer who fixes it without breaking everything else. I build and maintain production-grade systems using Java Spring Boot, React, Node.js, and cloud-native infrastructure. My work runs at scale: Microservices handling 20,000+ concurrent users (Spring Boot + Kafka + Kubernetes) REST APIs serving 50,000+ monthly users with clean contracts and error handling CI/CD pipelines on GitHub Actions and Jenkins with automated test gates AWS deployments (EC2, EKS, ECR, ALB) with zero-downtime rolling releases Elasticsearch integration cutting search response times from 800ms to under 200ms OAuth 2.0 + TLS security reducing vulnerability incidents by 70% What I help with: Java Spring Boot microservices — build, fix, optimize React frontend connected to backend APIs Kafka event-driven architecture Docker + Kubernetes deployments AWS cloud infrastructure CI/CD pipeline setup and maintenance API integration and debugging 100% Job Success · Rising Talent · 0-4hr response time If your system is slow, broken, or needs scaling — message me and I'll tell you exactly what's wrong.

I am a software engineer with 4 years of experience spanning backend development, DevOps, and cloud platform engineering. I build scalable, secure, and automated cloud platforms from the ground up and bring a developer-first mindset to every infrastructure challenge I take on. I work well independently and communicate clearly throughout every engagement, from scoping to delivery. BACKGROUND My career started in software development, building production applications using Spring Boot and Python. This backend foundation shapes how I approach cloud and DevOps work, because I understand what developers need from the platforms they run on. I have hands-on experience with modern AI/LLM tooling including LangChain, LangGraph, and LiteLLM, and I have integrated vector databases like OpenSearch into production systems. This means I can support teams building AI-powered products at both the application and infrastructure layer. WHAT I CAN DO FOR YOU Whether you are a startup building your first cloud environment or an established team dealing with scaling, reliability, or cost problems, I can step in at any stage of the process. * Design and build cloud infrastructure on AWS or GCP from scratch * Migrate existing workloads to the cloud with minimal downtime * Build and maintain backend services and REST APIs using Python or Java * Design relational and non-relational database schemas and optimize query performance * Containerize applications using Docker and orchestrate them with Kubernetes * Build or improve CI/CD pipelines using GitHub Actions or Jenkins * Implement GitOps workflows with ArgoCD for automated, auditable deployments * Write clean, reusable Terraform modules for reproducible infrastructure * Set up full observability with Prometheus, Grafana, and Loki so your team has visibility into everything * Harden your cloud environment for security and compliance * Optimize infrastructure costs without sacrificing performance or reliability * Integrate LLM tooling and AI components into cloud-native architectures CORE SKILLS Backend Engineering * Python, Java, Spring Boot * REST API design and development * PostgreSQL, MySQL, MongoDB, Redis * Message brokers: Kafka, RabbitMQ * Microservices architecture and system design * Authentication and authorization: OAuth2, JWT, Keycloak * Unit testing, integration testing, test-driven development DevOps & Platform Engineering * Kubernetes, Docker, Docker Compose * GitHub Actions, Jenkins, ArgoCD * Terraform, Linux, Bash scripting * Prometheus, Grafana, Loki AI & LLM Engineering * LangChain, LangGraph, LiteLLM * OpenSearch and vector database integration * RAG pipelines and LLM application development Cloud Platforms * AWS: End-to-end architecture, migrations, and optimization * GCP: Production-grade platform design and deployment CERTIFICATIONS Google Cloud * Google Cloud Professional Cloud Architect AWS (13 Certifications) Foundational * AWS Certified Cloud Practitioner * AWS Certified AI Practitioner Associate * AWS Certified Solutions Architect - Associate * AWS Certified Developer - Associate * AWS Certified SysOps Administrator - Associate * AWS Certified Data Engineer - Associate * AWS Certified Machine Learning - Associate Professional * AWS Certified Solutions Architect - Professional * AWS Certified DevOps Engineer - Professional * AWS Certified Generative AI Developer - Professional Specialty * AWS Certified Security - Specialty * AWS Certified Advanced Networking - Specialty * AWS Certified Machine Learning - Specialty HOW I WORK I treat every client engagement like a product. That means understanding the business context behind the technical requirement, communicating progress clearly, delivering clean and documented work, and making sure what I build can be maintained and extended after I am done. I do not disappear after delivery. I make sure things work. I am available for both short-term engagements and longer-term platform work. If you have a specific problem to solve or a platform to build, send me a message and we can determine if I am the right fit.

Senior Fullstack Software Engineer | Java, Node.js, React | CMS & IoT Expert 🚀 About Me I am a Senior Fullstack Software Engineer with 4+ years of experience in developing high-performance web applications, CMS platforms, and IoT solutions. My expertise spans across Java Spring Boot, Node.js, React, Magnolia CMS, and cloud-based architectures. I have led teams, optimized complex systems, and built scalable solutions for enterprise-level clients. 🔹 Backend: Java Spring Boot, Node.js, NestJS, Microservices, GRPC 🔹 Frontend: React.js, React Native, Headless CMS 🔹 CMS: Magnolia CMS, Liferay, WordPress 🔹 Databases: MySQL, MongoDB, SQL Server 🔹 DevOps & Cloud: Docker, Kubernetes, GitLab CI/CD, AWS 🔹 IoT & AI: Zigbee, MQTT, OpenCV, AI-based detection systems 💼 Notable Projects ✅ MMP’s CMS Website: Built a Java Spring Boot-based CMS optimized for high traffic and large datasets. ✅ Dentsu’s Headless CMS: Developed a scalable API-driven CMS using Magnolia CMS and React. ✅ Yoolife & YooIOC Applications: Smart city applications for residential and operational management. ✅ IoT Platform for Smart Devices: Developed a gateway integrating Zigbee, Z-Wave, and BLE devices with AI-powered event detection. 🔍 Why Work With Me? ✔ Proven expertise in enterprise CMS solutions & IoT systems ✔ Strong problem-solving skills in system architecture & optimization ✔ Experience leading development teams & mentoring junior engineers ✔ Passionate about building scalable, high-performance applications Let’s connect and bring your ideas to life! 🚀

I'm a Senior DevOps & Cloud Infrastructure Engineer with 6+ years of hands-on experience building, securing, and automating cloud infrastructure on AWS, GCP, and Azure. I specialize in: ✅ AWS infrastructure (ECS Fargate, EKS, RDS, S3, Lambda, Bedrock, Cognito, API Gateway, EventBridge, SQS, CloudTrail, CloudWatch, IAM, Secrets Manager, CodeDeploy, Control Tower) ✅ DevSecOps & Security (AWS WAF, Network Firewall, VPC architecture, SIEM/Wazuh, CJIS compliance, Site-to-Site VPN) ✅ Kubernetes & Containers (EKS, ECS, Helm, Docker, Argonaut) ✅ Infrastructure as Code (Terraform, AWS CDK) ✅ CI/CD Pipelines (GitHub Actions, CodePipeline, Bitbucket Pipelines) ✅ Monitoring & Observability (Prometheus, Grafana, Alertmanager, CloudWatch) ✅ Self-hosted PaaS (Coolify, Dokploy, Caprover) ✅ Shopify App Deployment (OAuth, CSP headers, webhooks, reverse proxy) ✅ GenAI Infrastructure (AWS Bedrock, RAG pipelines, Terraform modules for Bedrock Agents) Recent highlights: 🔹 Redesigned AWS VPC architecture with centralized egress/ingress via Network Firewall — resolved critical production security audit findings 🔹 Built production-ready Terraform module for AWS Bedrock GenAI infrastructure (RAG stack) used across Dev/Test/Prod environments 🔹 Designed HA Kubernetes clusters on Scaleway with Cloudflare failover, WireGuard VPN DR, and automated Helm/Terraform CI/CD 🔹 Deployed complete monitoring stack (Prometheus + Grafana + Alertmanager) with smart alerting for production workloads I work with startups and enterprises across SaaS, healthcare, fintech, and e-commerce. Whether it's a greenfield cloud setup, a security hardening project, or a CI/CD pipeline overhaul — I deliver clean, documented, production-ready work. Top Rated Plus on Upwork | 96% JSS | $21K+ earned