Bablu Kumar

Backend • Senior • 32 years • Bengaluru, India • UTC+05:30 • In office, Partially remote, Fully remote • Relocation • Work permits: India • English: C1 • Available in 4 weeks • from $60k per year

9+ years exp

4+ years ML exp

5+ projects

Java

Node JS

JavaScript

TypeScript

Scala

Python

SQL

Kotlin

Data Layer & Database: 5/10

API Design: 4/10

System Architecture: 4/10

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Overview

Technical skills

Timeline

Roles

Overview

Senior Software Engineer with 9+ years of experience building scalable, distributed, cloud-native and high-performance systems. Experienced in designing resilient microservices architectures, event-driven platforms, API ecosystems, and enterprise integration solutions with a strong focus on scalability, reliability, performance, observability, and fault tolerance. Currently working on large-scale financial and accounting integration systems, designing reliable workflows across multiple external platforms and building solutions around distributed processing, asynchronous communication, idempotency, data consistency, and system resilience. Strong experience in cloud-native architecture, containerized deployments, Kubernetes, CI/CD, distributed messaging, database optimization, caching, and production engineering. Hands-on experience in designing systems that handle high-volume workloads while maintaining reliability and operational efficiency. Also experienced in integrating Generative AI and Agentic AI capabilities into backend applications, including RAG, vector search, LLM integration, tool calling, and AI-driven workflows. Interested in building AI-enabled, scalable platforms that combine modern distributed architecture with intelligent automation. Focused on solving complex engineering problems, driving architectural decisions, improving system reliability and performance, and delivering scalable enterprise-grade solutions.

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Technical skills

Languages

Java

Node JS

JavaScript

TypeScript

Scala

Python

SQL

Kotlin

Databases

MySQL

PostgreSQL

Neo4j

Redis

Apache Kafka

DevOps

AWS

Rest API

Docker

GCP

Kubernetes

Other

ChatGPT

Angular

Next.js

Azure

React.js

LLM

Django

Google BigQuery

Oracle

Claude

LangChain

Mockito

ClickHouse

ScyllaDB

Amazon EC2

AWS Lambda

Salesforce

OpenSearch

Databricks

GitHub Actions

Grafana

Amazon EKS

Apollo

Terraform

GitLab CI

Git

Akamai

HubSpot

Sentry

Ansible

Prometheus

Cursor

Claude Code

Copilot

Twilio

Jenkins

CI/CD

CloudFormation

gRPC

GraphQL

Cline

Confluence

Chef

CWE

Platform Engineering

etcd

Dependency Injection

State Management

Gitflow

Timeline

Senior Software Engineer • Senior

Zact • Full-Time

Oct 2024 to Present 2 Years Partially remote

Built scalable and distributed financial integration systems with a focus on reliability, performance, and fault tolerance.
Designed event-driven microservices and asynchronous workflows for reliable data synchronization across accounting platforms.
Worked on high-volume processing, idempotency, retries, eventual consistency, and distributed transaction handling.
Contributed to cloud-native infrastructure modernization, Kubernetes, Kafka, CI/CD, and production reliability.
Hands-on experience integrating GenAI and Agentic AI capabilities into backend workflows and intelligent automation.

Java

Scala

Spring Boot

Rest API

Apache Kafka

AWS

GCP

MySQL

Docker

Kubernetes

Python

RAG

LLM

Claude Code

Cursor

Copilot

Ollama

Senior Software Engineer • Senior

Reddway • Full-Time

Nov 2021 to Oct 2024 2 Years 11 Months Delhi In office

Built and scaled multi-tenant SaaS platforms including Reddway and Property365, taking ownership of architecture, development, deployment, and production operations. Designed backend architecture with PostgreSQL-backed distributed microservices and event-driven workflows running in AWS. Implemented scalable REST APIs and Kafka-based processing, integrated third-party payment and logistics providers, and supported production incident resolution with code review and mentoring.

Java

Spring Boot

TypeScript

Node JS

Next.js

AWS

Apache Kafka

PostgreSQL

Neo4j

Docker

ChatGPT

OpenAI SDK

Software Engineer • Middle

Digital East GmbH • Full-Time

Jan 2020 to Sep 2021 1 Year 8 Months Bengaluru In office

Co-developed a dashboard platform from scratch and delivered cloud-native backend services for AWS production environments. Worked on scalable distributed systems, integrating REST APIs and microservices for platform functionality. Used Angular for the UI and implemented supporting data services using PostgreSQL, Redis, and containerized deployments with Docker.

Java

Spring Boot

Rest API

Angular

Node JS

PostgreSQL

Redis

Docker

Application Developer • Middle

BankBazaar • Full-Time

Jan 2017 to Dec 2019 2 Years 11 Months Bengaluru In office

Developed a user review service and backend services that supported digital loan application workflows. Implemented REST APIs and integrated database-backed logic for managing review functionality and loan flow operations. Worked with Java and Hibernate, and used Maven-based build tooling for service development.

Java

Rest API

MySQL

Hibernate

Maven

Maharashtra Institute of Technology

Bachelor's Degree • Computer Science

2013–2017 Pune, Maharashtra

Senior Backend Developer Confidence: Medium API Engineer

Backend Java engineer (mid-level) specializing in graph-backed REST APIs and data access logic. The strongest proven skill is designing graph queries and a robust data access layer as shown by GraphRepository.java with multi-hop Cypher traversals, parameterized queries, and exception translation. There is little public evidence of production-grade auth, schema migration history, or distributed-systems work such as caching, retries with backoff, or service-to-service contracts.

API Design

4/10

How well APIs are designed

Clear, conventional REST endpoints with a small helpful ResponseEntity use; lacks versioning, pagination, long-term error contract, idempotency keys, or advanced API governance.

Evidence

skillbridge-graph/src/main/java/com/skillbridge/controller/ApiController.java: GET endpoints and ResponseEntity usage for /pathfinder/skill-path

skillbridge-graph/src/main/resources/static/js/app.js: client-side calls and error handling for API endpoints

Data Layer & Database

5/10

Working with databases

Deliberate, non-trivial graph queries and safe parameter binding with exception translation; missing explicit transaction semantics and migration history.

Evidence

skillbridge-graph/src/main/java/com/skillbridge/repository/GraphRepository.java: complex Cypher queries (shortestPath, multi-hop traversals) and parameterized session.run(...) usage

skillbridge-graph/src/main/java/com/skillbridge/repository/GraphRepository.java: execute/executeVoid wrappers translating ServiceUnavailableException and Neo4jException into DatabaseUnavailableException

Scalability & Performance

3/10

Handling load and speed

Some query-level attention to graph traversal performance, but no caching, queueing, rate limiting, or measured optimizations and no explicit connection/timeouts tuning visible.

Evidence

skillbridge-graph/src/main/java/com/skillbridge/repository/GraphRepository.java: use of shortestPath and limited-hop Cypher patterns

skillbridge-graph/src/main/java/com/skillbridge/repository/GraphRepository.java: runSeedStatements for bulk statement execution

System Architecture

4/10

Overall system structure

Reasonable package layering (controller/service/repository/seed) and separation of concerns for a single-service monolith; no multi-service contracts or advanced config/secret strategies apparent.

Evidence

skillbridge-graph/src/main/java/com/skillbridge/service/GraphService.java: service layer delegating to repository and performing basic input checks

skillbridge-graph/src/main/java/com/skillbridge/controller/ApiController.java: REST controller exposing service behavior

Security & Auth

3/10

Protecting data and access

Good use of parameterized queries and exception hiding for DB errors; no auth/authz, token lifecycle, input schema enforcement at API boundary, or secrets-management artifacts visible.

Evidence

skillbridge-graph/src/main/java/com/skillbridge/repository/GraphRepository.java: run(..., Map.of(...)) parameter binding to avoid injection

skillbridge-graph/src/main/java/com/skillbridge/service/GraphService.java: basic input validation (e.g., rejecting identical skill or role ids)

Reliability & Observability

4/10

Stability and monitoring

Basic reliability patterns: catching DB connectivity errors and logging seed operations, health endpoint present; lacks retries with backoff, circuit breakers, structured correlation ids, metrics or graceful shutdown plumbing.

Evidence

skillbridge-graph/src/main/java/com/skillbridge/repository/GraphRepository.java: translate ServiceUnavailableException to DatabaseUnavailableException

skillbridge-graph/src/main/java/com/skillbridge/seed/SeedDataProvider.java: logging of parsed Cypher statements

Expertise

Java• Middle

Microservices & API Architecture• Middle

Databases & Vector Storage• Middle

Node.js• All Tiers

System Architecture• All Tiers

Technologies

MySQL• since 2017

PostgreSQL• since 2020

Redis• since 2020

Rest API• since 2017

Neo4j• since 2021

GCP• since 2024

AWS• since 2021

Docker• since 2020

Kubernetes• since 2024

Apache Kafka• since 2021

Explorer• mentioned only

Recommendations

Develop graph-backed API features and query-driven endpoints where Cypher expertise and repo/service/controller layering are key.
Build and harden data-access layers for Neo4j-like graph databases, including transaction boundaries and documented migration paths.
Implement production hardening for APIs: add versioning, pagination, authn/authz, observability (metrics/logging/traces), and resilience (retries/circuit breakers).

Repositories

The developer's experience in this domain has been verified based on AI analysis of the following repositories:

skillbridge-graph neetcode-submissions Multi-Step-Research-Agent