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Fiverr Pro
English
$
USD
I will build custom ai agents with tool calling using langgraph and openai sdk
Stack Soumik
About this gig
MODELS: GPT, Claude, Gemini, Llama, DeepSeek
WHY ME
Backend engineer first. I build agents with tests, logging and guardrails, so they work in production, not just in a demo.
Message me your use case and I'll suggest the best architecture for free.
Report and data-analysis agent
Internal ops assistant on your data
Sales/lead research agent
USE CASES
Support agent that resolves tickets
Clean Python/TypeScript code, Docker, deployed on your cloud
Multi-agent workflows with human approval steps
Integrations: CRM, Slack, Gmail, Sheets, Stripe, REST/GraphQL APIs, SQL
Memory and RAG knowledge from your documents
Reliable tool / function calling with validation and error handlingStop using chatbots that only talk. Get an AI agent that takes action.
I build production-ready AI agents that call your APIs, query your database, search the web, send emails, and finish real tasks on their own.
WHAT YOU GET
Custom agent built on LangGraph, OpenAI Agents SDK or CrewAI
Get to know Stack Soumik
Stack Soumik
Full Stack Developer Integration Specialist
- FromBangladesh
- Member sinceApr 2022
- Avg. response time1 hour
- Last delivery2 years
Languages
English, Bengali, Hindi, German
Thanks for stopping by! With 4 years of experience, I specialize in architecting robust, Payment Integration Specialist, and high-performance backend systems that power seamless user experiences. I leverage Node.js, NestJS, Express.js, and TypeScript to build efficient, maintainable applications.
🔹 Optimized RESTful & GraphQL API Development
🔹 Secure Authentication & Authorization (JWT, OAuth)
🔹 Scalable Microservices & Cloud Deployment
🔹 Database Management (MongoDB, PostgreSQL, Prisma)
🔹 Real-Time Functionality with WebRTC & Socket.io
🔹 Stripe Payment Integration Specialist
My Portfolio
Other AI Development Services I Offer
FAQ
Which framework do you use?
LangGraph for complex stateful flows, OpenAI Agents SDK for fast tool-calling agents, CrewAI for role-based teams. I choose based on your needs.
Do I need my own API keys?
Yes. You keep full ownership of the OpenAI/Anthropic keys, and model usage is billed to you directly.
Can it connect to my private system?
Yes. Any API, database or internal tool with access credentials or documentation works.
Will I get the source code?
Yes. Full source code, README, and setup instructions in every package.
How do you stop the agent doing wrong actions?
Input validation, permission-limited tools, human approval for risky steps, and test cases.
Do you offer ongoing support?
Premium includes 30 days. After that, monthly maintenance is available.
