05 / Experience

Years of building,learning and shipping.

Remote-first work with teams worldwide - across AI engineering, data platforms, 3D graphics and full-stack product development.

8+
Years of experience
7
Roles
7
Companies & clients
40
Technologies

01 / Roles

Where I’ve worked,and what I built there.

Open “What I built” on any role for the specific systems and results recorded for it.
  1. 2025Jan 2025 - PresentRemoteCurrent

    LLM & RAG Specialist

    Upwork

    LangChain · AI Workflow Automation (n8n) · RAG · Voice & Chat Agents

    What I built
    • Built Retrieval-Augmented Generation (RAG) systems using LangChain, vector databases (Pinecone, FAISS), and OpenAI GPT-4
    • Automated business processes using n8n, Retell AI, and Google Workspace integrations
    • Developed end-to-end GenAI apps for legal intake, customer support, and lead qualification with voice & chat agents
    • Architected data pipelines for analytics, reporting, and AI training using Python, PostgreSQL, and Google Sheets
    • Integrated full-stack systems with Next.js, Node.js, Supabase, and REST APIs for production-ready AI tools
    • LangChain
    • n8n
    • RAG
    • Pinecone
    • FAISS
    • OpenAI GPT-4
    • Retell AI
    • Next.js
    • Supabase
    • PostgreSQL
  2. 2024May 2024 - Jan 2025Remote

    Generative AI & Full Stack Developer

    Subhub

    LangChain · PineconeDB · Supabase · Twilio · Eleven Labs

    What I built
    • Developed AI-driven solutions using LangChain, PineconeDB, and LangFlow for advanced NLP workflows and RAG systems
    • Built real-time applications with Supabase and PostgreSQL Realtime for seamless data sync
    • Integrated Twilio for SMS notifications and Eleven Labs for voice capabilities to enhance user engagement
    • Designed scalable solutions with Python, Next.js, and Supabase - translating business needs into robust APIs
    • LangChain
    • Pinecone
    • LangFlow
    • Supabase
    • PostgreSQL
    • Twilio
    • Eleven Labs
    • Python
    • Next.js
  3. 2023May 2023 - Dec 2023Remote

    Machine Learning Engineer

    Most Loved Workplace

    Text Analytics · Statistical ML · Data Mining · Python

    What I built
    • Developed statistical machine learning and data mining solutions for text analytics and business problems
    • Transformed business requirements into analytical models, algorithms, and reporting solutions at scale
    • Implemented ML algorithms on large structured and unstructured datasets to surface hidden patterns and insights
    • Python
    • scikit-learn
    • Text Analytics
    • Statistical ML
    • Data Mining
  4. 2022Aug 2022 - Apr 2023Remote

    Full Stack Engineer

    Crewfare.com

    Node.js · AWS Lambda · Serverless · React · Storybook

    What I built
    • Built APIs and web services in Node.js using MVC architecture and AWS Serverless Framework
    • Refactored Redux actions to Promises and lifecycle methods to async/await, cutting container dev time by 80%
    • Built features for 100,000+ users using CSS3, Flexbox, Storybook, React Navigation, and Animated APIs
    • Deployed in-house applications to AWS using EC2, RDS, S3, CloudFront, ELB, and CloudSearch
    • Node.js
    • AWS Lambda
    • Serverless Framework
    • React
    • Storybook
    • AWS EC2
    • RDS
    • S3
    • CloudFront
  5. 2021Nov 2021 - Aug 2022Remote

    3D Web Graphics & Blockchain Developer

    Vircadia

    Solidity · Web3.js · Three.js · Babylon.js · WebGL

    What I built
    • Created Ethereum smart contracts in Solidity and built DApps with HTML, JavaScript, Node.js, and Web3.js
    • Developed accurate, simultaneous rendering of heterogeneous and multi-resolution meshes (Biva Visibility Test - patent pending)
    • Worked on Mindbenders WebGL engine - optimized Virtual Texturing and rendering passes
    • Built 2D/3D rendering with Three.js, Babylon.js, Fabric.js; handled OBJ/3DS to CTM/FBX conversions via Blender
    • Solidity
    • Web3.js
    • Three.js
    • Babylon.js
    • WebGL
    • Blender
  6. 2020Nov 2020 - Feb 2022Remote

    Full Stack Engineer

    Breaker Nation

    React Native · Redux Saga · Push Notifications · App Store Deployment

    What I built
    • Built static UI and dynamic attributes for large automotive applications with custom push notifications and REST APIs
    • Refactored error handling with React Native alert dialogs - reduced user input errors by ~44%
    • Deployed apps to Google Play Store and Apple App Store; led adoption of React Native best practices
    • Authored UML-compliant high-level designs (Class, Sequence, Activity diagrams, Use Cases)
    • React Native
    • Redux Saga
    • Push Notifications
    • REST APIs
  7. 2019Aug 2019 - Feb 2021Remote

    Full Stack Developer

    Anekonnect Incorporated

    React · Next.js · Node.js · Redux-Saga · Ant Design · SQL

    What I built
    • Built RESTful web services and SPAs with React, React Native, Next.js, and Node.js
    • Implemented middleware with Redux-Thunk, Redux-Saga, Redux-Logger, and Universal React Redux
    • Followed Agile/Scrum methodology with Rally for sprint tracking
    • Wrote complex SQL queries, stored procedures, functions, and packages - DDL and DML operations
    • React
    • Next.js
    • Node.js
    • Redux-Saga
    • Ant Design
    • SQL
    • React Native

02 / Education

Where it started.

  1. -

    Indian Institute of Technology Guwahati

    Degree
    Bachelor of Science (Honours)
    Field of study
    Data Science and Artificial Intelligence

    Practical, industry-aligned curriculum across data engineering, MLOps, and applied AI at one of India's premier technology institutes.

  2. -

    Khulna University of Engineering and Technology

    Qualification
    Undergraduate Studies
    Field of study
    Mechanical Engineering

    Studied Mechanical Engineering before transitioning into software and technology. I later pursued a professional career in software engineering, data engineering, automation, and AI.

  3. -

    Govt. Azizul Haque College, Bogura

    Qualification
    Higher Secondary Certificate (H.S.C)

    GPA 5.00/5.00 - strongest subjects: Mathematics, Physics, and English.

03 / Certifications

Continuous learning.

23 certificates across AI, software engineering and cloud.

04 / Testimonials

What clients say.

Feedback from founders, engineering leaders and clients.
Pankaj was a great to work with on a complex automation project involving n8n, GoHighLevel, Retell AI, Google Calendar, Twilio, and several connected systems. He brings strong skills in AI automation, API integrations, LLM applications, RAG, agentic AI, multi-agent systems, and MCP server integration. Throughout the project, he was responsive, professional, and reliable, delivering consistently quality work on time. What stood out most was his proactive approach - he pointed out issues early, suggested practical solutions, and helped make the overall workflow more effective.
Bruce RobinsonFounder & Managing Partner, Robinson & Associates, LLC
Pankaj has a very positive and professional approach to work. His dedication has guided Anekonnect from a wiring diagram application to a full-blown drawing and design application. His unwavering commitment to project timelines and excellent communication ensured the team delivered on time.
Bhabin ShahCo-Founder, Anekonnect Incorporated
I highly recommend Pankaj as a skilled JavaScript, TypeScript, and React developer. He consistently develops complex applications with efficiency and precision. Having pair-coded with him, he collaborates effectively with developers and stakeholders.
Sami KallinenFounder, 8-bit-sheep
Pankaj is a super contractor. Very professional with great communication. His skills are astounding - he always went above and beyond, encouraging and pushing the team to stick to deadlines.
Marcelo PerezverdiaUpwork Client
Pankaj was a great co-worker and a friend. He has always provided not only skilled work but also an excellent communicator. He translates complex technical concepts into simple terms. His strong work ethic, technical ability, and collaborative approach make him an excellent addition to any team.
Ankit KumarPartner, Dhmics Technologies · Engineering, Crewfare
Pankaj has been a great help to the projects and has contributed many successful feature releases. He's very patient and easy to work with - able to jump on multiple JS projects and learn new skills as needed.
Charles MarkovichStarscraper.io
Pankaj was really patient and understanding of our needs - we felt very safe working with him. He's knowledgeable, skilled, and great at communication. Looking forward to working with him again.
Ahmad MatyanaCo-Founder, Alethea AI
Pankaj helped us develop React-based web pages in a very short time. He also put in additional effort to resolve some issues happening only on our end to ensure our deadlines were met. He's one of the best rising talents on Upwork - very happy to work with him on future tasks.
Sujith VellatUpwork Client
Pankaj Kumar Pramanik was a pleasure to work with. He asked all the right questions to get the job completed in a timely manner.
Chris ThomasUpwork Client

Work together

Need this experienceon your team?

Tell me about the role or project. I’ll be direct about where I can help and where someone else would be a better fit.

Let’s chat