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Bishal Chakraborty

Software Engineer II @OakNorth | Ex Engineer - Offline Merchants, PhonePe | Ex SDE Backend - Codezin

Bengaluru

2+ years of work experience

OakNorth
Mar 20266 mosPresent

London, England, United Kingdom

• Engineered an AI-powered financial document analysis pipeline — LangGraph multi-agent orchestration with 5 Claude-based agents (business unit extraction, CoA rule derivation, value mapping, rule refinement), human-in-the-loop review interrupts, crash- recoverable async processing via SQS and PostgreSQL state checkpointing; built an MCP server using FastMCP exposing operations as tools for LLM clients with Langfuse LLM observability • Designed and shipped RESTful APIs for covenant formula management and alert monitoring — discriminated-union AST persisted as PostgreSQL JSONB, multi-layer Pydantic v2 validation (field-level regex, semantic date checks, partial-update semantics), soft-delete with full audit trail • Engineered an AWS Lambda calculation engine evaluating 600+ Chart of Accounts and covenant accounts across 38 months per borrower — per-borrower commits preventing partial rollbacks, async delivery via SNS/SQS to downstream BigQuery powering Lightdash monitoring dashboards • Built idempotent breach and CIFD alerting Lambdas — SHA-256 content-based hashing for exactly-once Slack notification delivery, per-record commits preventing partial failures, self-correcting hash cleanup on alert resolution • Traced and eliminated a silent data-loss bug corrupting 100% of covenant formula saves in production — root cause: Pydantic v2 custom serializer silently stripping fields on every write; fixed at model layer with full regression test coverage
PhonePe
Mar 20251 yr 1 moMar 2026

Bengaluru, Karnataka, India

𝙀𝙣𝙜𝙞𝙣𝙚𝙚𝙧𝙞𝙣𝙜 𝙘𝙤𝙣𝙫𝙚𝙧𝙨𝙖𝙩𝙞𝙤𝙣𝙖𝙡 𝘼𝙄 𝙖𝙣𝙙 𝙞𝙣𝙩𝙚𝙡𝙡𝙞𝙜𝙚𝙣𝙩 𝙄𝙑𝙍 𝙖𝙩 𝙋𝙝𝙤𝙣𝙚𝙋𝙚 Driving Conversational AI and backend voice automation at PhonePe, India’s leading payments platform with 600M+ users, 40M+ merchants, 330M+ daily transactions, and ₹150L Cr+ annual TPV. Enabling Multilingual voice support, for 11 primary languages across the Indian territory based on demographics. Integrate Python-driven LLM pipelines for real-time speech intent parsing and multilingual classification at scale. Automate call tagging, dynamic routing, and fallback handling through backend rule engines for 40M+ merchant queries. Embed semantic understanding for edge-case resolution across diverse voice inputs nationwide. Deploy observability hooks & async workers ensuring sub-second response cycles across 330M+ daily transactions. Stack: Java, Spring Boot, Python, LLMs, VXML, Redis, Elasticsearch, REST APIs, Webhooks
Codezin Technology Solutions Private Limited
Feb 20241 yr 2 mosMar 2025

Kolkata, West Bengal, India

Built and scaled a multi-tenant SaaS powering all major Indian ports & airports, enabling 10M+ containers & air cargo shipments annually. Engineered real-time validation pipelines processing 200K+ JSON lines/minute, reducing customs clearance delays by 95%. Designed and deployed OCR + ML models parsing 50K+ invoices, manifests & shipping bills/day, cutting manual processing time from 3 hrs → 10 mins. Developed secure REST APIs with JWT authentication, AES encryption, and automated billing, generating invoicing/year across clients. Architected CRM + cargo tracking system handling 2M+ live tracking events/day, with <150ms API latency at scale. Implemented containerized microservices (Docker + Django) with 99.99% uptime, supporting 100K+ concurrent trade ops across ports. Stack: Python, Django, REST APIs, PostgreSQL, Redis, OCR (Tesseract), ML Models, JWT, Docker, Webhooks
LeetCode
@satyanweshium235

Bishal’s AI Stack

anthropic apis
anthropic apis
claude code
claude code
claude
claude
cursor
cursor
gemini
gemini
langgraph
langgraph

Education

Hooghly Engineering and Technology College

Bachelor of Technology - BTech (Hons.), Computer science and engineering

Hooghly Engineering and Technology College

20204 yrs2024

Authpur National Model Higher Secondary School

200415 yrs2019

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Headline

Software Engineer II @OakNorth | Ex Engineer - Offline Merchants, PhonePe | Ex SDE Backend - Codezin

About

Software Engineer working across Backend Engineering, Data Platforms, Conversational AI, and AI-Assisted Automation in fintech and banking ecosystems. • Currently building scalable calculation engine and automating data ingestion pipeline at OakNorth Bank using FastAPI, AWS , Lambda, LangGraph, Aurora PostGres, GCP Pub/Sub, AWS S3, and event-driven architectures powering borrower analytics and lending intelligence. • Previously worked on IVR & Conversational AI systems at PhonePe, building scalable merchant-support automation platforms using Spring Boot microservices, VXML, NLP integrations, and distributed workflows. • Experienced in designing high-performance backend systems, asynchronous pipelines, ETL workflows, OCR-based extraction systems, workflow automation, and scalable APIs handling large-scale operational workloads.

Location

Bengaluru

AI stack

anthropic apis

claude code

claude

cursor

gemini

langgraph

Work experience

Software Engineer II - Monitoring & AI at OakNorth, Mar 2026 - Present · 6 mos, London, England, United Kingdom, • Engineered an AI-powered financial document analysis pipeline — LangGraph multi-agent orchestration with 5 Claude-based agents (business unit extraction, CoA rule derivation, value mapping, rule refinement), human-in-the-loop review interrupts, crash- recoverable async processing via SQS and PostgreSQL state checkpointing; built an MCP server using FastMCP exposing operations as tools for LLM clients with Langfuse LLM observability • Designed and shipped RESTful APIs for covenant formula management and alert monitoring — discriminated-union AST persisted as PostgreSQL JSONB, multi-layer Pydantic v2 validation (field-level regex, semantic date checks, partial-update semantics), soft-delete with full audit trail • Engineered an AWS Lambda calculation engine evaluating 600+ Chart of Accounts and covenant accounts across 38 months per borrower — per-borrower commits preventing partial rollbacks, async delivery via SNS/SQS to downstream BigQuery powering Lightdash monitoring dashboards • Built idempotent breach and CIFD alerting Lambdas — SHA-256 content-based hashing for exactly-once Slack notification delivery, per-record commits preventing partial failures, self-correcting hash cleanup on alert resolution • Traced and eliminated a silent data-loss bug corrupting 100% of covenant formula saves in production — root cause: Pydantic v2 custom serializer silently stripping fields on every write; fixed at model layer with full regression test coverage

Software Engineer at PhonePe, Mar 2025 - Mar 2026 · 1 yr 1 mo, Bengaluru, Karnataka, India, 𝙀𝙣𝙜𝙞𝙣𝙚𝙚𝙧𝙞𝙣𝙜 𝙘𝙤𝙣𝙫𝙚𝙧𝙨𝙖𝙩𝙞𝙤𝙣𝙖𝙡 𝘼𝙄 𝙖𝙣𝙙 𝙞𝙣𝙩𝙚𝙡𝙡𝙞𝙜𝙚𝙣𝙩 𝙄𝙑𝙍 𝙖𝙩 𝙋𝙝𝙤𝙣𝙚𝙋𝙚 Driving Conversational AI and backend voice automation at PhonePe, India’s leading payments platform with 600M+ users, 40M+ merchants, 330M+ daily transactions, and ₹150L Cr+ annual TPV. Enabling Multilingual voice support, for 11 primary languages across the Indian territory based on demographics. Integrate Python-driven LLM pipelines for real-time speech intent parsing and multilingual classification at scale. Automate call tagging, dynamic routing, and fallback handling through backend rule engines for 40M+ merchant queries. Embed semantic understanding for edge-case resolution across diverse voice inputs nationwide. Deploy observability hooks & async workers ensuring sub-second response cycles across 330M+ daily transactions. Stack: Java, Spring Boot, Python, LLMs, VXML, Redis, Elasticsearch, REST APIs, Webhooks

Software Developer and Engineer - Backend at Codezin Technology Solutions Private Limited, Feb 2024 - Mar 2025 · 1 yr 2 mos, Kolkata, West Bengal, India, Built and scaled a multi-tenant SaaS powering all major Indian ports & airports, enabling 10M+ containers & air cargo shipments annually. Engineered real-time validation pipelines processing 200K+ JSON lines/minute, reducing customs clearance delays by 95%. Designed and deployed OCR + ML models parsing 50K+ invoices, manifests & shipping bills/day, cutting manual processing time from 3 hrs → 10 mins. Developed secure REST APIs with JWT authentication, AES encryption, and automated billing, generating invoicing/year across clients. Architected CRM + cargo tracking system handling 2M+ live tracking events/day, with <150ms API latency at scale. Implemented containerized microservices (Docker + Django) with 99.99% uptime, supporting 100K+ concurrent trade ops across ports. Stack: Python, Django, REST APIs, PostgreSQL, Redis, OCR (Tesseract), ML Models, JWT, Docker, Webhooks

Education

Bachelor of Technology - BTech (Hons.), Computer science and engineering, Hooghly Engineering and Technology College

Authpur National Model Higher Secondary School

Public links

leetcode: https://leetcode.com/satyanweshium235