Building a Deal Intelligence Agent with FastAPI, React, and Hindsight

Saloni verma — Fri, 05 Jun 2026 17:59:26 +0000

🚩 The Problem

Every LLM I’ve worked with has the same fundamental flaw: it forgets everything the moment a request ends.
For a chatbot answering trivia, that’s fine.
For a sales intelligence agent that needs to recall objections from three calls ago, competitor mentions from last quarter, and the fact that the CTO is the real decision‑maker — it’s a non‑starter.

That’s the gap we set out to solve when building the Deal Intelligence Agent: a FastAPI + React system that gives sales teams a persistent, queryable memory layer across their pipeline.

⚙️ Architecture Overview

We designed the agent as a layered system where memory is a first‑class citizen:

FastAPI backend → REST + streaming endpoints

MemoryService → wraps Hindsight SDK for semantic retrieval

LLMService → Groq Llama 3.3 70B completions with injected context

DealService → orchestrates memory + LLM logic

React frontend → chat, deal detail, competitor radar, risk heatmap, revenue forecasting

Twilio + SMTP → SMS, voice calls, personalized follow‑up emails

Every outbound action — SMS, email, briefing — writes back to Hindsight as a memory event. The agent’s context grows with every interaction.

📝 How Memory Gets Written

Memory writes are treated as domain events, not side effects.

python

async def store_memory(
    self,
    deal_id: str,
    entry_type: str,
    content: str,
    metadata: Optional[Dict] = None
) -> Dict:
    entry = {
        "id": self._generate_id(deal_id, content),
        "deal_id": deal_id,
        "type": entry_type,
        "content": content,
        "embedding_text": f"[{entry_type.upper()}] Deal {deal_id}: {content}"
    }

    if self.use_hindsight:
        result = await asyncio.to_thread(
            self.client.memory.store,
            user_id=deal_id,
            text=entry["embedding_text"],
            metadata={"deal_id": deal_id, "type": entry_type, "content": content, **metadata}
        )

Embedding text prepends [OBJECTION], [COMPETITOR], [STAKEHOLDER] → retrieval is context‑aware.
Async wrappers (asyncio.to_thread) prevent blocking FastAPI’s event loop.

🔍 How Memory Gets Read

Retrieval is scoped by deal ID, ensuring precision.

python

@app.post("/api/chat")
async def chat(msg: ChatMessage):
    memories = []
    if msg.deal_id:
        memories = await memory_svc.get_relevant_memories(
            deal_id=msg.deal_id,
            query=msg.message,
            limit=10
        )

    response = await llm_svc.chat_with_context(
        user_message=msg.message,
        memories=memories,
        deal_id=msg.deal_id,
        extra_context=msg.context
    )

The agent runs semantic search, returns the top 10 relevant entries, and injects them into the prompt.
Responses shift from generic advice to deal‑aware strategy.

📊 Example Context Injection

text

[MEMORY CONTEXT]
1. [OBJECTION][2024-11-03] Price is 40% above current vendor
2. [COMPETITOR][2024-11-03] Salesforce mentioned as incumbent
3. [STAKEHOLDER][2024-10-28] David Kim (CTO) — wants API docs
4. [PRICING][2024-11-10] Offered 15% discount; they want 25%
💡 Lessons Learned

Treat memory writes as domain events, not logs.

Scope memory by the right identity (deal_id worked best).

Semantic retrieval beats brute‑force context stuffing.

Async wrappers prevent concurrency bugs.

Graceful degradation makes onboarding smoother.

🎯 Conclusion

LLMs are stateless — but agents don’t have to be.
With Hindsight, the gap between “generic chatbot” and “deal‑aware agent” closes with a handful of well‑placed store_memory and get_relevant_memories calls.

The model stays dumb.
The architecture makes it look smart.

👉 Repo: https://github.com/chaitanya07-ai/deal-intelligence-agent

👉 Live Demo: https://deal-intelligence-agent-1.onrender.com

DEV Community: Saloni verma

Building a Deal Intelligence Agent with FastAPI, React, and Hindsight