Tawhid Ahmed

Proficient Information Systems · Investar BD

Junior Software Engineer

Spring Boot microservices platform for Dhaka Stock Exchange brokerage operations, covering the full trading lifecycle: order entry, pre-trade risk controls, FIX exchange execution, and real-time market data. Live at oms.investarbd.com.

• Developed order-lifecycle, client-management, and pre-trade restriction endpoints across the OMS and CAT services within a nine-service microservices architecture, and added message consumers handling execution reports and order-status events.
• Built the trading terminal front end — order entry, blotter, watchlist, and portfolio — streaming live order, execution, and market-data updates into the UI over WebSockets.
• Owned the platform's AI features: a conversational trading assistant with LLM tool-use over MCP and streamed responses, and per-symbol technical analysis computing 30-day RSI, SMA, and VWAP indicators.

Java 21 · Spring Boot 3 · Spring Cloud · RabbitMQ · PostgreSQL · Redis · QuickFIX/J · STOMP WebSockets · OAuth2 · JWT · Azure OpenAI · MCP · Vue 3 · Quasar · Pinia · Docker

Proficient Information Systems

Junior Software Engineer

Fiat ↔ USDC remittance platform integrating the Stellar blockchain and the MoneyGram anchor, backed by a double-entry ledger and a KYC compliance workflow.

• Implemented REST endpoints and service-layer logic across the user, transaction, KYC, and ledger modules, contributing to a double-entry ledger with idempotent postings and a transaction state machine spanning 20+ deposit, withdrawal, transfer, hold, and reversal states.
• Built the MoneyGram deposit and withdrawal integration over Stellar SEP-10 / SEP-24, with scheduled jobs polling provider status and reconciling inbound USDC payments streamed from Horizon.
• Developed the wallet front end — authentication, dashboard, transactions, and KYC — including secure identity-document upload through backend presigned URLs.

Java 21 · Spring Boot 3.5 · Spring Modulith · PostgreSQL · Stellar SDK · Horizon · OAuth2 · JWT · Vue 3 · TypeScript · Quasar · Pinia · Docker

Proficient Information Systems · Internal task-management SaaS

Junior Software Engineer · designed and built AI end to end

Conversational assistant for a multi-tenant task-management SaaS (SuperCards) that grounds an LLM in live backend data — giving management insight into task states and workload distribution, and helping individual users track and improve their own performance. Live at app.supercards.ca.

• Designed and built the assistant as a FastAPI + LangChain / LangGraph microservice that grounds LLM answers in live REST-API data through a bounded tool-calling loop, removing an entire class of hallucinated figures.
• Implemented nine domain tools behind a view-scoped registry so each page exposes only the relevant tools, with deterministic pre-LLM logic and scope labelling to keep reported totals accurate.
• Built tenant-scoped RAG for tag resolution using per-tenant vector indexes with hybrid literal and semantic retrieval, and shipped the chat widget with persisted per-view threads and server-driven charts.

Python · FastAPI · LangChain · LangGraph · FAISS · Sentence-Transformers · Groq · Ollama · Laravel REST API · Vue 3 · Quasar · Pinia · ApexCharts