Senior AI & Full Stack Engineer

Senior AI & Software Engineer with 6+ years of experience architecting high-performance distributed systems using Java/Python/NodeJS and Applied Multi Agent AI solutions including Agentic Workflows and GraphRAG systems using LangGraph.

  • Expert In RAG and Enterprise Knowledge Graph System
  • Experienced In AI SAAS Applications
  • Expert in Building Microservices using SpringBoot/NodeJS/FastAPI
  • Expert In Infrastructure as Code (IaC) and AWS/Azure/GCP
Shahariar Hossen - Senior Full Stack Engineer specializing in Spring Boot, React, and Microservices Architecture

Available

for consultancy

Expertise in Java & Microservices

6+ years of experience building enterprise-grade systems with AI/ML, FastAPI, Spring Boot, NodeJS, React, and Cloud technologies for international clients

Cefalo logo
Senior Software Engineer
Cefalo
May 2023 - Present*
Remote, Norway
Jan 2024 - Present*

Developed NTB's Image Portal and Billing System (Spring Boot, Stripes, JSP, React.js). Requirement analysis, design, and collaboration with international teams. Implemented CI/CD pipelines on AWS.

May 2023 - Dec 2024

Full Stack Developer for Core System, Document Signing, and AML solutions (Scala, Lift, Spring Boot, PostgreSQL). Database design with normalization, indexing, and query optimization.

BJIT INC. | Rakuten INC. | Japan logo
Senior Software Engineer
BJIT INC. | Rakuten INC. | Japan
Mar 2022 - Apr 2023
Backend, DevOps - Japan
Mar 2022 - Apr 2023

Migrated Rakuten Beauty (E-commerce) from PHP to Java; backend and DevOps in private cloud. Built event-driven microservices using Kubernetes, Helm, Redis, GraphQL, Elasticsearch, Logstash, Kibana, Grafana.

UDPlatforms INC. | USA logo
Software Engineer
UDPlatforms INC. | USA
Apr 2021 - Feb 2022
Full Stack, DevOps - USA
Apr 2021 - Feb 2022

Built low-code/no-code platform with event-driven microservices (Micronaut, Flask, NodeJS, Flutter, GCP, AI/ML). Practiced DDD, TDD (90%+ coverage), clean code, SOLID, DRY, KISS.

Oct 2019 - Mar 2021
Full Stack, DevOps - Bangladesh

Key contributor in BKASH AML360 and BKASHSIS with microservices (Spring Boot, Angular, MySQL, MongoDB). End-to-end SDLC: requirements, design, backend, database modeling, deployment. Implemented caching with Redis, JWT authentication, and TDD.

Enterprise Projects & Expertise

Enterprise-grade systems built with AI/ML, Python, FastAPI, Java, Spring Boot, NodeJS, React & Microservices for international clients including Rakuten, NTB, and bKash

GraphRAG AI system built by Shahariar Hossen using Python, LangGraph, and Neo4j for Cefalo Norway
GRAPH RAG - AI-Powered Graph Retrieval System using Python, LangGraph & Neo4j

Cefalo, Norway

Architected an enterprise GraphRAG system to centralize complex organizational data, enabling high-accuracy, context-aware querying of nonlinear relationships across employee profiles and HR policies.

Key Achievements:
  • Built a Multi-Agentic AI system using LangGraph to automate the end-to-end pipeline
  • Engineered a custom Entity-Relationship Extraction engine
Technologies:
Python (FastAPI)LangGraphLangChainRAG+4 more
AI Meeting Minutes system by Shahariar Hossen using OpenAI Whisper and LangChain for automated meeting summaries
Meeting Minutes - AI-Powered Summary Generation with OpenAI & LangChain

Cefalo, Norway

Automates meeting summaries across Google Meet, Zoom, and Teams with a centralized dashboard for managing AI-generated minutes.

Key Achievements:
  • Developed Scalable AI SaaS solution with microservices architecture
  • Developed Intelligent Summarization service using OpenAI and Hugging Face model
  • Lead the team to ensure team collaboration for delivering high throughput in limited time
Technologies:
OpenAI WhisperHugging Face TransformersLLaMA 3RAG+6 more
NTB Image Portal - Media asset management platform built by Shahariar Hossen using Java Spring Boot and AWS for NTB Norway
NTB Image Portal - Java Spring Boot & AWS Media Management SaaS

NTB, Norway

Developed NTB's Image Portal (bilder.ntb.no), Norway's leading media asset management platform serving news organizations and creative professionals. Built a scalable SaaS solution with microservices architecture for storing, organizing, and distributing millions of images and videos. Implemented advanced search capabilities using AWS OpenSearch and integrated billing systems for subscription management. Collaborated with international teams on requirements analysis, system design, and deployment. The platform handles high-volume media assets with efficient search and retrieval capabilities.

Key Achievements:
  • 3x faster search performance with AWS OpenSearch
  • Scalable microservices architecture
  • AWS cloud deployment
Technologies:
Java 8Spring BootAWSTerraform+4 more
Visena Office Management platform by Shahariar Hossen using Scala, Lift Framework, and Spring Boot for Norwegian lawyers and accountants
Visena Office Management - Scala & Spring Boot Enterprise Solution

Visena, Norway

Developed Visena's comprehensive office management SaaS platform (https://my.visena.com/visena/origo/nb_NO/home) for lawyers and accountants. Features include Core System, Document Signing, compliance, AML solutions, Database design with normalization, indexing, and query optimization.

Key Achievements:
  • Full AML compliance system
  • Document signing workflow
  • Multi-tenant architecture
Technologies:
Scala 2Lift FrameworkSpring BootAzure+6 more
Rakuten Beauty e-commerce platform migration by Shahariar Hossen using Java Spring Boot and Kubernetes for Rakuten Japan
Rakuten Beauty E-commerce - Java Spring Boot Microservices Migration

Rakuten INC, Japan

Key contributor to the migration of Rakuten Beauty's $200M/year e-commerce platform from legacy PHP to modern Java microservices architecture. Worked as part of a 15-member team and directly mentored 2 junior engineers.

Key Achievements:
  • 3x API performance improvement
  • Mobile-first GraphQL services
  • Zero-downtime migration
Technologies:
JavaSpring BootKubernetesHelm+6 more
Rakizo Cloud Platform by Shahariar Hossen - Low-code platform built with Micronaut, Flask, and GCP
Rakizo Cloud Platform - Low-Code Platform with Micronaut & GCP

UDPlatforms Inc, USA

Low-code/no-code platform with event-driven microservices. Implemented DDD patterns and achieved 90%+ test coverage with comprehensive AI/ML integration. Built low-code/no-code platform with event-driven microservices (Micronaut, Flask, NodeJS, Flutter, GCP, AI/ML). Practiced DDD, TDD (90%+ coverage), clean code, SOLID, DRY, KISS.

Key Achievements:
  • Reusable CRUD library
  • 90%+ test coverage
  • Event-driven architecture
Technologies:
MicronautFlaskNodeJSGCP+4 more
BKASH AML360 anti-money laundering system by Shahariar Hossen using Spring Boot microservices for Bangladesh's largest mobile financial service
BKASH AML360 - Spring Boot Microservices for Anti-Money Laundering

DataSoft, Bangladesh

Anti-money laundering system handling millions of transactions daily. Built scalable microservices architecture with real-time monitoring and compliance reporting. Key contributor in BKASH AML360 and BKASHSIS with microservices (Spring Boot, Angular, MySQL, MongoDB). End-to-end SDLC: requirements, design, backend, database modeling, deployment. Implemented caching with Redis, JWT authentication, and TDD.

Key Achievements:
  • Spearheaded end-to-end development of enterprise AML solution from concept to production
  • Engineered scalable microservices architecture processing 10M daily transactions
  • Designed comprehensive database ecosystem for high-volume financial data monitoring
  • 200% KPI achievement
Technologies:
Spring BootAngular 8MySQLMicroservices+6 more
BKASHSIS sanction screening engine by Shahariar Hossen using Spring Boot and Machine Learning for financial security
BKASHSIS - Spring Boot Sanction Screening Engine with Machine Learning

DataSoft, Bangladesh

Malicious user screening engine processing high-volume transactions. Implemented advanced algorithms for real-time user behavior analysis and risk assessment. Key contributor in BKASH AML360 and BKASHSIS with microservices (Spring Boot, Angular, MySQL, MongoDB). End-to-end SDLC: requirements, design, backend, database modeling, deployment. Implemented caching with Redis, JWT authentication, and TDD.

Key Achievements:
  • 40-45M daily records screening
  • Real-time fraud detection
  • Advanced ML algorithms
Technologies:
Spring BootAngular 8MongoDBRedis+2 more

Certifications & Training

Security
OWASP Top 10:2021 in Java Learning Path
SecurFlagMarch 2025

Advanced security practices for Java applications

View Certificate
Programming
Oracle Certified Professional, Java SE 8 Programmer II
OracleJan 2021

Advanced Java programming and best practices

View Certificate
Programming
Oracle Certified Associate, Java SE 8 Programmer I
OracleDec 2020

Fundamental Java programming concepts

View Certificate
Cloud
Microsoft Azure Administrator
ICT DivisionNov 2021

Azure cloud infrastructure and administration

View Certificate
AI/ML
Machine Learning
IIT(DU)Dec 2023

500-hour comprehensive machine learning program

500 hr
Data Science
Data Science Modeling, Integration & Processing
Professional TrainingNov 2020

Advanced data science and analytics techniques

320 hrView Certificate
Architecture
Enterprise Systems Analysis & Design with J2EE
Professional TrainingOct 2019

Enterprise application architecture and design patterns

1000 hrView Certificate
Mobile
Android Application Development
Professional TrainingOct 2019

Native Android application development

1000 hrView Certificate

Get In Touch

Ready to discuss your next project? Let's build something amazing together.

Let's Connect

I'm always interested in new opportunities and exciting projects. Whether you need a senior developer for your team or want to discuss a consulting project, I'd love to hear from you.

Email

shshetu2017@gmail.com

Phone

+8801624967336

Location

Available for remote work worldwide

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