Kazi Md. Tawsif Rahman Backend Software Engineer Let’s talk

Software Engineer at BRAC IT Services

Backend systems built for real workflows—not just happy paths.

I build Java and Spring Boot systems where business rules, data integrity, asynchronous work, and long-term maintainability matter. My recent work spans CRM, ticketing, and event-driven operational platforms.

Explore selected work [email protected]

Selected professional work

Systems with rules, state, and operational consequences.

The strongest work is rarely one clever endpoint. It is the collection of decisions that keeps an evolving product coherent.

01 CRM platform

BRAC IT Services · Backend engineering

Turning sales operations into a rule-driven platform.

Built backend capabilities for accounts, contacts, leads, opportunities, quotes, campaigns, territories, products, and configurable pipeline boards. The work centered on converting evolving business policies into maintainable application behavior.

Key engineering decisions

  • Modeled Kanban moves with transition validation, idempotency, rank ordering, and audit history.
  • Implemented territory and assignment rules with schedule checks and duplicate-assignee protection.
  • Kept API, service, mapping, persistence, and rule-evaluation responsibilities clearly separated.
168
REST endpoints
30
controllers
Modular
Spring architecture

Spring Boot · PostgreSQL · Flyway · Redis · RabbitMQ · OpenAPI

02 Ticketing system

BRAC IT Services · Backend engineering

Making support operations measurable and assignable.

Developed a ticketing backend covering intake, triage, comments, forwarding, team operations, notifications, metadata, and service-performance tracking. The system needed to route work fairly while preserving a clear operational history.

Key engineering decisions

  • Designed least-loaded team routing, absence-reliever behavior, and workload updates.
  • Implemented SLA and KPI tracking alongside activity logs, flags, and configurable fields.
  • Split assignment, forwarding, feedback, workload, and metadata into focused services.
96
REST endpoints
21
controllers
SLA
and KPI tracking

Spring Boot · PostgreSQL · Redis · Quartz · RabbitMQ · JPA

Independent builds

Small systems for studying hard backend problems.

I use focused projects to make architecture decisions visible, testable, and easier to discuss than production work can be.

Event-driven delivery GitHub ↗

NotifyFlow

A notification latency simulator that persists delivery records, fans out broadcasts through RabbitMQ, and streams per-user status and latency updates over WebSocket/STOMP.

  • Hexagonal, multi-module backend
  • Async fan-out with durable delivery state
  • Live latency and coverage visibility

Java 25 · Spring Boot · RabbitMQ · PostgreSQL · WebSocket

Distributed transactions GitHub ↗

Spring Saga Orchestrator

An event-driven order workflow across order, inventory, and payment services, with autonomous data ownership, explicit failure events, and inventory compensation when payment fails.

  • Idempotent event consumers
  • Outbox-style event publishing
  • Traceable saga state and compensation

Java 25 · Spring Boot 4 · RabbitMQ · MongoDB · Docker

Capabilities

How I approach backend work.

Frameworks change. The useful part is knowing how to translate a messy domain into explicit, observable, and testable behavior.

01

Model the workflow

Make states, transitions, permissions, failure paths, and invariants visible before the code spreads them everywhere.

02

Protect consistency

Use transactions, idempotency, validation, audit records, and carefully owned data to keep changes explainable.

03

Design for operations

Treat retries, queues, schedules, logs, metrics, and failure recovery as part of the product—not afterthoughts.

Backend

Java · Spring Boot · Spring Security · Spring Data JPA · Hibernate · Spring Modulith

Data

PostgreSQL · MongoDB · Redis · Flyway · JSONB · indexing · query design

Messaging & jobs

RabbitMQ · asynchronous processing · retry handling · Quartz · WebSocket/STOMP

Engineering

REST · OpenAPI · DDD · CQRS · MapStruct · JUnit 5 · Mockito · Docker · Git · Linux

Background

Engineering foundation.

A computer-science education, competitive-programming discipline, and hands-on ownership of backend products.

Dec 2024 — Present

Software Engineer

BRAC IT Services Ltd. · Dhaka, Bangladesh

Backend systems for CRM and ticketing products.

Sep 2024

B.Sc. in Computer Science & Engineering

Chittagong University of Engineering and Technology (CUET)

CGPA 3.59 / 4.00

2024

Published research

An Automated System for Detecting Property Insurance Fraud Using Machine Learning

View publication ↗

Competitive programming

Codeforces Specialist

1500+ rating · Finalist at CUET IUPC 2023 and 2024.

Contact

Let’s build something that stays maintainable.

I’m interested in backend engineering roles and conversations about workflow-heavy, event-driven, and data-intensive systems.

Send me an email