Vishal L.-Full Stack Developer • React.js & Python (FastAPI) • AI/LLM Integration
Check rate
Experience
AI Evaluation Engineer (Software Engineering)
AfterQuery Experts
- Design repository-grounded software engineering benchmarks to evaluate AI coding agents on realistic feature requests, bug fixes, and complex multi-file code changes.
- Build implementation-agnostic hidden test suites and reference code solutions to objectively verify functional correctness, edge cases, and regression safety.
- Define behavioral specifications, acceptance criteria, and public API expectations while preserving flexibility in how coding agents implement the solution.
- Analyze coding-agent performance through automated verification, regression testing, failure analysis, and benchmark difficulty calibration across real-world codebases.
AI Agent Evaluation Engineer
Handshake AI
- Designed and authored challenging, realistic command-line tasks to evaluate the capabilities of AI coding agents.
- Developed tasks that tested AI models' ability to explore terminal environments, execute code, and solve multi-step problems.
- Utilized tools such as Docker, Git/GitHub, and the Harbor (tb) harness to create and manage tasks.
- Contributed to identifying and addressing limitations in AI coding agents through task creation and evaluation.
- Collaborated with a global team to enhance the robustness and reliability of AI systems.
- Also design end-to-end AI training/evaluation task packages, comprising a realistic professional prompt, supporting input evidence, a reference-quality solution, and a detailed scoring rubric, modeling multi-step software engineering workflows to benchmark frontier LLMs against expert-level output.
Senior Software Developer (Full Stack)
Hyperminds Tech Pvt. Ltd.
- Architected components of Sigma, a microservices-based enterprise platform (HRMS, CRM, Desk, Payments, Project) containerized with Docker, focusing on the CRM, Desk, and AI Agent modules.
- AI Agent Platform: Built LangChain ReAct-based conversational AI agents (FastAPI, AWS Bedrock, Qdrant) with Elasticsearch-backed RAG retrieval for natural language interaction with CRM and project management APIs, with secure JWT-based tool invocation and vector-based persistent memory.
- CRM-Service: Architected a multi-tenant CRM backend (FastAPI, PostgreSQL, Redis) covering contacts, deals, pipelines, tickets, and a Marketing Hub (campaigns, journeys, lead scoring, segments, SMS, ads, attribution), with RBAC, workflow automation, and bulk import/export.
- Desk-Service: Architected a customer support platform (FastAPI, PostgreSQL) with ticket lifecycle management, SLA tracking, multi-locale knowledge base, OAuth-based integrations, and real-time SSE notifications, supporting 27+ webhook event types and email-to-ticket ingestion.
- ETL Core Platform: Built a scalable ETL orchestration platform (FastAPI/Flask, SQLAlchemy, Alembic, Celery, Redis, Kafka) with multi-connector architecture (Salesforce, HubSpot, GitHub, Oracle), cutting onboarding time for new data sources by ~60% via a standardized adapter interface; parallelized processing delivered a 3-4x throughput improvement, reliably handling 5M+ records per run.
React.js Developer
I am Careers Pvt. Ltd.
- Delivered responsive, high-quality UIs for Devasmriti Marketsverse, Retired App, and Frissly web app using React.js, Material-UI, and CSS, enhancing user experience across platforms.
Full Stack Developer
RCS Tech LLP
- Worked on frontend and backend development using React.js, TypeScript, Python (FastAPI), and PostgreSQL for Zolo and Unacademy procurement platforms, improving ERP and asset management modules.
- Built and integrated RESTful APIs with Redux Toolkit for state management and Tailwind CSS / Material-UI for responsive UI; collaborated with backend developers on secure, efficient API endpoints.
- Wrote unit and integration tests with Jest and React Testing Library, conducted code reviews, optimized performance by reducing unnecessary API calls, and worked in an Agile environment.
Full Stack Developer
Vervali Systems Pvt. Ltd.
- Worked on full stack development using React.js, Material UI, JavaScript, TypeScript, Python (FastAPI), Node.js/Express.js, PostgreSQL, and MongoDB for Elevate Trips and Ease My Trip (hospitality platforms) and Axis Bank GrabDeals.
- Developed dynamic, responsive UIs with React.js, Material UI, Tailwind CSS, and Bootstrap; built and integrated REST APIs using FastAPI and Express.js, with database design across PostgreSQL and MongoDB.
- Implemented state management with Redux and Redux Thunk for async operations; used TypeScript to improve type safety and code quality; collaborated cross-functionally to scale features.
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Information Technology, Education, Real Estate, Banking and Finance, and Tourism.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Product Development, and Quality Assurance.
Summary
Full Stack Developer with 3.5+ years of experience designing and building scalable web applications, microservices, and ETL pipelines using React.js, Python (FastAPI), and PostgreSQL. Specialized in system design, distributed systems, and async processing, with proven impact including a 3-4x throughput improvement and reliable processing of 5M+ records per run. Experienced integrating AI/LLM systems (LangChain, AWS Bedrock, RAG) into production platforms, plus freelance work designing and benchmarking AI agent evaluation tasks. Strong track record of collaborating across teams to ship clean, maintainable, production-grade software.
Skills
- Frontend: React.Js, Redux Toolkit, Redux Thunk, React Flow, React Query, Context Api, Mui, Tailwind Css, Bootstrap
- Backend: Python (Fastapi/Flask), Node.Js / Express.Js, Sqlalchemy, Alembic, Celery, Rest Api Design, Microservices & Etl Architecture, Distributed Systems, System Design, Async Processing, Data Consistency
- Ai / Ml: Langchain (React Agents), Langgraph, Flowise, Openai, Gemini, Hugging Face, Aws Bedrock, Qdrant, Elasticsearch Rag, Vector Search, Embeddings, Prompt Engineering, Mcp, Ai Agent Evaluation & Benchmarking
- Languages: Javascript, Typescript, Python, Html5, Css3, Sql
- Databases & Messaging: Postgresql, Mongodb, Redis, Elasticsearch, Kafka
- Cloud & Devops: Aws (Ec2, S3, Lambda, Boto3), Docker, Git, Axios, Jwt, Oauth2, Rbac, Sse, Webhooks, Ci/Cd (Github Actions)
- Testing & Practices: Jest, React Testing Library, Pytest, Postman, Swagger/Openapi, Agile, Responsive Web Design, Workflow Automation
Languages
Education
Shivaji University
BSc · Chemistry · Kolhapur, India
Certifications & licenses
Python Certification
freeCodeCamp
Relational Database Certification
freeCodeCamp
Statistics
Experience
Global experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Vishal is based in Kolhapur, India and prefers 100% remote projects.
Vishal speaks the following languages: Hindi (Native), Marathi (Native), English (Advanced).
Vishal has at least 3 years of experience. During this time, Vishal has worked in at least 5 different roles and for 6 different companies. The average length of individual experience is 1 year and 7 months. Note that Vishal may not have shared all experience and actually has more experience.
Based on recent experience, Vishal would be well-suited for roles such as: AI Evaluation Engineer (Software Engineering), AI Agent Evaluation Engineer, Senior Software Developer (Full Stack).
Vishal's most recent position is AI Evaluation Engineer (Software Engineering) at AfterQuery Experts.
In recent years, Vishal has worked for AfterQuery Experts, Handshake AI, Hyperminds Tech Pvt. Ltd., I am Careers Pvt. Ltd., and RCS Tech LLP.
Vishal is most experienced in industries like Information Technology, Education, and Real Estate. Vishal also has some experience in Banking and Finance and Tourism.
Vishal is most experienced in business areas like Information Technology, Product Development, and Quality Assurance.
Vishal holds a Bachelor in Chemistry from Shivaji University.
Vishal has 2 certificates. These include: Python Certification and Relational Database Certification.
Vishal is immediately available part-time for suitable projects.
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Calculated based on our freelancers’ daily rates as of 4 Oct 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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