Headline

Senior Backend Engineer | Distributed Systems & AI Integration | Java • Spring Boot • Kafka • PostgreSQL

About

Senior Backend Engineer with 10+ years of experience architecting distributed systems and production platforms using Java, Spring Boot, Kafka, and PostgreSQL across networking, fintech, and privacy/ESG. Led platform modernization, secure SSO, high-volume payment processing, and production LLM/vision integrations — including a consolidation initiative contributing to an estimated $7M in potential cost savings. Highlights: • SSO across 3 services — auth latency cut from 3 sec → 800 ms (~73%) • Led a 4-engineer team; migrated 65K access points into a unified network (~$7M potential savings) • Payment settlement platform: 10M+ txn/day design, 3–5M settlements, ~417 TPS within a 2-hour SLA • Production AI (Claude Vision): API cost ↓42%, latency 600ms → 180ms What I’m known for: • System design for microservices and high-throughput integrations • Taking ambiguous platform problems from architecture → production • Performance, cost, and resilience (caching, rate limits, circuit breakers, DLQ) • Practical AI integration (LLM/vision APIs, RAG) — product features, not demos Stack: Java, Spring Boot, Kafka, PostgreSQL, AWS/Docker, Python/ETL, RAG/pgvector Open to Senior Backend / Platform / Distributed Systems roles where ownership, architecture depth, and measurable impact matter.

Location

Bengaluru

AI stack

anthropic apis

claude code

langchain

ollama

PydanticAI

Qwen

Work experience

Senior Engineer at Cambium Networks, Jun 2022 - Present · 4 yrs 4 mos, Bengaluru, Karnataka, India, • Designed and drove adoption of centralized Single Sign-On (SSO) across 3 services, cutting authentication latency from 3 sec to 800 ms (~73%) and eliminating duplicated login systems across the product ecosystem. • Modernized legacy JSP/Spring applications into Spring Boot APIs and Dockerized AWS deployments, improving maintainability, security, observability, and cloud readiness for a large multi-product device estate. • Led a 4-engineer team through a cross-product migration of 65K access points into a unified network with centralized customer management, contributing to a projected $7M in cost savings. • Designed and implemented organization-level subscription APIs and reusable lifecycle templates, standardizing provisioning and accelerating subscription workflow onboarding across products. • Shipped AI-powered wall detection for network floorplan/deployment workflows using Claude Vision; reduced API cost by 42% and latency from 600ms to 180ms through LRU caching and token-output optimization.

Senior Software Engineer at OneTrust, Sep 2021 - Jun 2022 · 10 mos, Bangalore Urban, Karnataka, India, • Contributed to end-to-end delivery of ESG platform backend capabilities for compliance-critical workflows; platform services designed to handle ~1000 requests/sec from various emission sources. • Designed database schema and audit-logging architecture to enforce regulatory traceability, data integrity, and end-to-end auditability across critical workflows. • Engineered PySpark ETL on Azure Data Lake for ~300 GB/month emissions data from various sources, meeting a ≤10-minute freshness SLA for Power BI dashboards (incremental/micro-batch; peak ingestion throughput ~300–400 MB/s).

Software Engineer-1 at ACI Worldwide, Mar 2021 - Aug 2021 · 6 mos, Bengaluru, Karnataka, India, • Led architecture of a distributed payment-settlement platform designed to scale to 10M+ transactions/day across 50–60 concurrent instances; processes 3–5M settlements (3M+ within a 2-hour SLA, ~417 TPS average) using parallel processing and resilience patterns including rate limiting, circuit breakers, retries, and DLQ.

Associate Software Engineer at ACI Worldwide, Jul 2016 - Feb 2021 · 4 yrs 8 mos, Bengaluru, Karnataka, India, • Designed and developed a reusable Java/Spring middleware framework that enabled a monolithic application to integrate with multiple downstream microservices through an API Gateway, centralizing access-token acquisition, caching, and refresh. • Engineered an Apache Drools-based password-policy engine, replacing code-driven policy changes with configuration-driven updates and reducing release overhead. • Enhanced and maintained enterprise web applications using Java and JSP, delivering features, performance improvements, and production support for business-critical systems. • Built and executed Selenium automated test suites, improving coverage and reducing manual testing effort for releases. • Partnered with cross-functional teams to troubleshoot production issues and deliver customer requirements on time.

Software Engineer Intern at HPE Aruba Networking, Feb 2016 - Jun 2016 · 5 mos, Bengaluru, Karnataka, India, • Automated network controller and access-point health monitoring with a Pexpect-based POC, replacing manual checks and enabling earlier failure detection.

Education

Bachelor of Engineering, Computational Science, PES University

Svm

Public links

github: https://github.com/mani41

leetcode: https://leetcode.com/kumarm3