ai-receipt-tracker
Flagship monorepo: Next.js web app, Flutter mobile app and a TypeScript API with auth, Stripe in test mode and LLM receipt extraction (mock provider by default).
Featured projects
ros2-voice-command-robot
ROS2 robot driven by voice: VAD, speech-to-text and local LLM intent parsing turn spoken commands into Nav2 goals in a Gazebo world. Mock backends in CI.
AI and LLM systems 13
agent-guardrails-observability
Python LangGraph agent with memory, mock Jira/ServiceNow tools, OpenTelemetry tracing, guardrails, evals and red-team tests (offline demo)
llm-serving-finetune-lab
LLM serving lab: vLLM config with CPU fallback, QLoRA fine-tune on a tiny model, quantisation comparison, Helm chart with HPA, load tests
multi-agent-langgraph-workflow
Multi-agent LangGraph workflow: planner, researcher and writer agents with human-in-the-loop approval
mcp-jira-github-server
MCP server connecting AI agents to Jira and GitHub
llm-rag-api
FastAPI RAG service with pluggable LLM providers (OpenAI, Anthropic, Gemini, Mistral, DeepSeek, Llama)
llm-eval-observability
LLM evaluation and observability: prompt versioning, regression evals, LLM-as-judge, cost and latency tracing
rag-llm-eval-demo
Retrieval-augmented QA service with local embeddings and an evaluation harness that runs without an API key.
document-ai-extraction
Document AI pipeline: OCR + LLM extraction of invoices into validated structured JSON with accuracy report
lora-finetune-small-llm
LoRA supervised fine-tuning pipeline (transformers, peft, trl) that turns maintenance logs into structured JSON.
offline-voice-assistant
Offline voice assistant: on-device speech-to-text, local LLM and text-to-speech
azure-openai-functions-bot
Python Azure Functions support assistant on Azure OpenAI with tool calling (order lookup, ticket creation) and Bicep infrastructure.
gcp-vertex-ai-agent
Python support agent on Gemini (Vertex AI) with tool calling, FastAPI, Cloud Run and Firestore targets; offline mode by default.
search-ranking-recsys
Hybrid BM25 + embeddings retrieval with LightGBM learning-to-rank, offline NDCG/MRR evaluation and A/B simulation
Mobile (Flutter, Android, iOS) 8
flutter-offline-first-app
Flutter offline-first inspection checklists: Drift (SQLite) storage and a sync queue that pushes when back online.
flutter-on-device-ml
Flutter on-device object detection (TensorFlow Lite) and text recognition (ML Kit); photos never leave the phone.
flutter-ble-health-tracker
Flutter app: BLE wearable heart-rate tracking with offline-first sync to Firebase
flutter-ride-booking-demo
Flutter rider app on OpenStreetMap with fares and a simulated driver, backed by a Cloudflare Workers API with D1 and Durable Objects.
kotlin-ble-iot-companion
Kotlin Android BLE sensor companion: scan, connect, decode notifications, live charts, Room storage, CSV export.
android-mvvm-retrofit-app
Native Android app: Kotlin, MVVM, Hilt, Retrofit/OkHttp, Coroutines/Flow, Room, unit and UI tests
kmp-compose-swiftui-pos
Kotlin Multiplatform POS demo: shared module, Jetpack Compose Android app with Room and GraphQL, small SwiftUI client
ios-swiftui-app
Native iOS SwiftUI app with SwiftData, async/await networking and XCTest
Full stack and cloud 25
nextjs-saas-dashboard
Next.js SaaS analytics dashboard (Signalboard) with organisations, projects, events, role-based access and charts.
react-ts-fleet-dashboard
React + TypeScript real-time fleet monitoring dashboard
angular-admin-portal
Angular admin portal (Harborline): route guard and HTTP interceptor auth, NgRx entity store, server-style paging, English and Spanish i18n.
laravel-vue-saas-starter
Multi-tenant SaaS starter (Keel): Laravel 11, Vue 3, Inertia, Tailwind, team roles enforced with policies.
payments-stripe-api
Payments API: Stripe checkout and webhooks, idempotency keys, ledger and reconciliation job
vat-tax-ledger-engine
TypeScript EU VAT (incl. Ireland) and sales tax rules engine with double-entry ledger, idempotency keys and property-based tests
realtime-chat-backend
Real-time chat backend: WebSockets, Redis pub/sub, presence and typing indicators
graphql-federation-gateway
Apollo Federation 2 gateway over two TypeScript subgraphs with JWT checks and query depth and complexity limits.
fullstack-graphql-grpc-demo
Hotel desk demo: React client, GraphQL gateway and a gRPC booking service.
go-grpc-inventory-service
Go inventory service with idempotent stock reservations, serving gRPC and a gRPC-Gateway REST API.
go-ride-dispatch
Go microservice for ride-hailing driver matching and dispatch
springboot-banking-ledger-api
Spring Boot double-entry banking ledger with BigDecimal amounts and optimistic locking for concurrent transfers.
spring-boot-wallet-api
Spring Boot wallet/ledger REST API with Jenkins CI pipeline
dotnet-blazor-admin-portal
.NET 8 Blazor admin portal (Meridian Desk) with role-based sign-in, customers, orders, tickets and a minimal API layer.
dotnet-ride-booking-api
ASP.NET Core 8 ride-booking minimal API with EF Core + SQLite, xUnit tests, Swagger, Docker and GitHub Actions CI
aws-serverless-api
Serverless reservation API: Cognito JWT, API Gateway HTTP API, Python Lambda, DynamoDB single table, SQS worker and EventBridge expiry.
terraform-multicloud-api
Terraform modules deploying a containerized API to AWS (ECS + RDS) and GCP (Cloud Run)
k8s-microservice-deploy
Microservice deployed on Kubernetes with Helm, tested on a kind cluster in GitHub Actions
jenkins-gitops-pipeline
Jenkins pipeline that promotes a Python service through Kustomize overlays, with Argo CD manifests.
opentelemetry-tracing-demo
Three-service checkout flow emitting OpenTelemetry traces, metrics and logs to Jaeger, Prometheus and Grafana.
camunda-bpmn-order-workflow
Camunda 8 (Zeebe) order approval process with Spring Boot job workers and a DMN decision table.
kotlin-growth-experiments-service
Kotlin Spring Boot A/B experiments service: GraphQL, Postgres, DynamoDB Local, Kafka events, Testcontainers tests
crypto-custody-signer
Go HD wallet (BIP32/39/44) custody signer with multi-approval policy engine, Vault transit signer and testnet-only tx building
cpp-vectorized-query-engine
C++20 columnar vectorized query operators (scan, filter, hash join, aggregate) with GoogleTest, benchmarks and sanitizers
system-design-case-studies
System design notes: humanoid onboard stack, ride-hailing dispatch, POS, drone mission control, edge vision, agent platform.
Robotics, drones and edge AI 11
ros2-nav2-slam-sim
ROS 2 Humble indoor robot: Gazebo office world, slam_toolbox mapping, Nav2 and a YAML waypoint mission runner.
px4-drone-mission-planner
PX4 survey-grid mission planner: polygon to lawnmower path, geofence and return-to-home energy checks, MAVSDK upload.
ros2-drone-mission-sim
ROS2 drone waypoint mission planner and simulator
ros2-vision-tracking-demo
ROS 2 pipeline: YOLO detection plus a ByteTrack-style Kalman and IoU tracker, publishing annotated images.
robot-fleet-mqtt-telemetry
ROS2 robot fleet telemetry over MQTT into TimescaleDB with alerting and dashboard
robot-learning-vla-demo
Data-centric robot learning on a planar arm in simulation.
edge-yolo-tensorrt
Fine-tuned YOLO for edge devices with ONNX/TensorRT export and Jetson benchmarking scripts
edge-vision-detector
Real-time object detection for edge devices (Jetson / Raspberry Pi) with OpenCV + ONNX
cpp-flight-controller
Modern C++17 drone flight-control library: PID attitude control, Kalman/complementary sensor fusion, unit-tested with CMake + GoogleTest
humanoid-edge-ai-gps-denied-sim
Simulation code, metrics, and figures for edge-AI humanoid operations in GPS-denied environments. Synthetic data only. Authors: Arpan Bom, Sushanta Khadka.
firefighter-multimodal-edge-ai-sim
Simulation code, metrics, and figures for multimodal edge-AI firefighter helmet safety monitoring. Synthetic data only. Authors: Arpan Bom, Sushanta Khadka.
The repositories above are open-source portfolio demos. Each README states what is simulated or mocked, and no production metrics are claimed. Client and employer work (Titan humanoid, drones, CityRide, Impact Atlas) is private.