AVAILABLE FOR SENIOR ROLES

Sayed Mahmud
Raihan

Senior Software Engineer — Full-Stack & Cloud · Dhaka, Bangladesh

8+ years designing and shipping production-grade systems — from core banking platforms handling card transactions in ISO-8583, to cloud-native SaaS built on AWS. Backend-first, security-conscious, and obsessed with scalable architecture.

Get in Touch ↗ LinkedIn Profile GitHub

Years experience

16+

Shipped projects

10+

AWS services

Companies

About

Architect by instinct,
engineer by craft.

I'm a Senior Software Engineer with deep roots in enterprise backend development using Java, C#, .NET, and Spring Boot. My career has taken me through banking core systems, payment gateways, SaaS platforms, and cloud-native applications — giving me a rare breadth of domain experience.

At VoiceCradle LLC, I architect and lead development of AWS-hosted applications — handling everything from system design and CI/CD pipelines to team management and third-party API integrations. At DataSoft, I built the engineering fundamentals that continue to serve me: requirements analysis, clean architecture, and rigorous testing disciplines.

I'm currently deepening my expertise in Kubernetes, Terraform, and event-driven architecture — positioning myself at the intersection of senior engineering and cloud infrastructure. I hold a B.Eng in Computer Science from Noakhali Science & Technology University, where my thesis focused on SQL injection analysis and prevention.

Outside of code: I run programming workshops, led NSTU's Open Source Network as Secretary, and champion PCI-DSS compliance practices in payment systems.

🏗️
Systems architect
Design for scalability, fault tolerance, and observability before the first line of code.

☁️
AWS cloud practitioner
Production deployments using EC2, RDS, Lambda, EventBridge, S3, Route53, and more.

🔐
Security-first mindset
Led PCI-DSS compliance; hands-on with JWT, OAuth2, Spring Security, and ISO-8583 card protocols.

🤖
AI integration experience
Integrated OpenAI, Claude, and agentic AI workflows into production systems using N8N.

👥
Engineering lead
Managed dev teams, conducted code reviews, and mentored engineers across multiple projects.

Experience

Where I've built things.

8+ years across fintech, SaaS, and cloud-native product companies.

VoiceCradle LLC NOV 2021 — PRESENT

Software Development Engineer

Architected and led development of a full-scale property bidding platform (USAHomeBids). Own the complete AWS infrastructure including CI/CD via CodeCommit, EC2, RDS, S3, Route53, and Elastic Beanstalk. Built and maintain a custom Amazon Connect CCP with chat integration. Developed third-party API integrations and integrated agentic AI workflows using OpenAI, Claude, and N8N. Led and mentored the engineering team through product scaling.

Java Spring Boot C# .NET AWS EC2 Lambda EventBridge Amazon Connect RDS OpenAI Claude AI N8N Quartz Job Jasper Reports Spring ACL CI/CD

DataSoft Systems Bangladesh Ltd. OCT 2016 — OCT 2021

Software Engineer

Five-year tenure building enterprise Java and .NET applications across payment, banking, healthcare, and logistics domains. Led requirement analysis, BRD/SRS documentation, and full-cycle software development. Developed payment aggregator middleware, smart meter services, and a health card management system. Conducted programming workshops and directly managed project timelines. Contributed to PCI-DSS compliance efforts on payment systems.

Java C# .NET Spring Boot ASP.NET MVC MySQL MSSQL MongoDB PostgreSQL Angular TypeScript Docker Jenkins ELK Stack Redis ISO-8583 PCI-DSS

Skills

The full toolkit.

Backend-first, cloud-capable, security-aware — with production experience across the entire stack.

⚙️ Backend

Java / Spring Boot95%

C# / .NET / ASP.NET90%

REST API / Web API95%

Microservices Architecture88%

Spring Security / OAuth2 / JWT92%

☁️ Cloud & DevOps

AWS (EC2, RDS, Lambda, S3…)85%

CI/CD (GitLab, AWS Pipelines)88%

Docker85%

Jenkins80%

Kubernetes (learning)45%

🗄️ Databases

MSSQL92%

MySQL / PostgreSQL90%

MongoDB85%

AWS DynamoDB80%

Redis82%

🌐 Frontend

Angular / TypeScript88%

JavaScript / jQuery90%

HTML / CSS / Bootstrap92%

Thymeleaf / JSP90%

🔧 Tools & More

Apache Kafka RabbitMQ ELK Stack Swagger Git / GitHub Entity Framework Jasper Reports Quartz Job Amazon Connect WebSockets SOAP ISO-8583 PCI-DSS Linux Server N8N OpenAI API Claude API Agentic AI

📊 Data Science

Python75%

R Programming65%

Machine Learning (Stanford)60%

Projects

Production systems, shipped.

A selection of systems I've designed, built, or led — from payment infrastructure to cloud-native SaaS.

🏠

↗

PROPERTY TECH · AWS · FULL-STACK

USAHomeBids

Property bidding platform for the US market. Architected the full backend and AWS infrastructure. Built multi-tenant access control using Spring ACL, automated workflows with Quartz Scheduler, and integrated Amazon Connect for call centre management. Owns CI/CD pipeline via AWS CodeCommit.

Spring Boot AWS Elastic Beanstalk Lambda Spring ACL Quartz

📞

↗

IVR · AMAZON CONNECT · DASHBOARD

IntellCX

Comprehensive management dashboard for custom IVR systems built on Amazon Connect. Delivers real-time call analytics, agent performance metrics, and operational reporting consumed by US-based operations teams.

Java Amazon Connect CloudWatch ElasticSearch

💳

↗

FINTECH · PAYMENT WALLET

Pay365

Backend service for a payment wallet application. Implemented card transaction processing in ISO-8583 format and integrated bill payment APIs (DESCO, DPDC, BGSL). Part of PCI-DSS compliance initiative.

Java Spring Security ISO-8583 PCI-DSS

🏦

BANKING · CORE SYSTEM · CONFIDENTIAL

SBAC Bank Core Systems

Payment solution, core banking backend, card transactions, and in-house applications (ticketing, ERP, reporting) for a commercial bank. Daily usage by 100+ bank staff. Integrated bill payment APIs for major utilities.

Java .NET MSSQL Angular ELK Stack Jasper Reports

🏥

↗

HEALTHCARE · SMART CARD

Proshomon

Smart health card management system enabling digital patient record management and hospital coordination across Bangladesh.

Java Spring Boot MySQL Thymeleaf

🔗

↗

SAAS · ATS · SOCIAL PLATFORM

Artemis (Zora Corp)

Application tracking system with social platform features and a built-in recommender system. High-throughput NoSQL storage across DynamoDB and MongoDB. Integrated Stripe, PayPal, and Twilio.

Spring Boot DynamoDB MongoDB Redis Stripe

Certifications