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Abubakar Siddique Butt.

Senior Backend Software Engineer

Designing fault-tolerant
AI-driven distributed systems.

Scaling cloud-native
AI infrastructure.

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Proven Impact

Delivering quantifiable results at scale.

10M+

Lookups Handled

Real-time scaling with zero hotspots

80%

Performance Boost

Via advanced caching strategies

24h → 4h

Billing Cycles

Reduced processing time

100%

Client Satisfaction

Across diverse global teams

Experience spanning organizations & platforms

Extreme NetworksEmumbaUpworkFiverrRockville TechnologiesX solutionsStella TechnologyExtreme NetworksEmumbaUpworkFiverrRockville TechnologiesX solutionsStella Technology

Selected Work

Systems built to scale.

Fault-tolerant distributed transactions

DS

Distributed SAGA Orchestrator

A Go-based orchestration service coordinating SAGA workflows across microservices — reliable transaction management, fault-tolerant rollback handling, and data consistency under high-volume production traffic.

GoKafkaKubernetesPostgreSQL
Code

Sub-second event processing

RE

Real-Time Event Pipeline

Event-driven microservices built on Spring Boot and Apache Kafka delivering sub-second distributed event processing with reliable, ordered message delivery across services at scale.

Spring BootKafkaRedisDocker
Code

Millions of lookups, no hotspots

CC

Cassandra Caller-ID Lookup

A distributed data layer with custom sharding and partition-key strategies powering a high-speed Caller-ID service that maps millions of numbers in real time with zero hotspots.

CassandraJavaSpring CloudRedis
Code

Near-real-time healthcare analytics

HH

Healthcare HIE Data Platform

Large-scale GCP pipelines (Dataflow, Pub/Sub, BigQuery) ingesting and transforming high-volume HIE data with HL7/FHIR interoperability and HIPAA-compliant EFS-backed storage.

GCPBigQueryHL7 / FHIRAWS EFS
Code

24h → 4h billing cycle

AB

Async Billing & Payments Engine

A multi-tier subscription billing platform re-architected around RabbitMQ for parallel async workflows, with rollback and retry logic that cut billing cycle time from 24h to 4h.

RabbitMQJavaPostgreSQLDocker
Code

End-to-end distributed tracing

OS

Observability Stack (ELK + APM)

Centralized log aggregation, application performance monitoring, and anomaly detection across distributed services with end-to-end tracing and real-time operational visibility.

ElasticsearchELKAPMGrafana
Code

Capabilities & Stack

An interactive constellation of my stack.

Java

95%

Built ultra-low-latency, memory-efficient microservices.

Go

85%

Designed Orchestration Service for distributed workflows.

Python

90%

Scripting and backend service automation.

Quarkus

85%

High-performance, memory-efficient microservice frameworks.

Central Hub

Technology Stack

GraalVM

80%

Significantly improved runtime performance and startup times.

Kotlin

75%

Modern, concise backend service development.

SQL

95%

Optimized high-throughput transactional queries and indexing.

Wall of Love

Feedback from leaders and clients.

"I had the pleasure of working with Abubakar on a project I led, and his expertise in Java and cloud-native applications developement was truly impressive. He consistently delivered high-quality work, demonstrating strong software developement and problem solving skills with both efficiency and skill. Abubakar was also an excellent team player, seamlessly integrating into the team and providing valuable insights and support. His positive attitude and collaborative spirit significantly enhanced our project's success and team dynamics. What set Abubakar apart was his exceptional work ethic and drive. His commitment to excellence and hard work were evident in every task he undertook. I highly recommend Abubakar for any role seeking a talented and motivated Java developer."

AA

Abdullahi Abdullahi

SR Director, Distinguished Engineer/Architect

Extreme Networks

"Very professional, asking all the right questions and committed to deliver the best code and documentation. Problems are solved with good communication and patience. See you on the next project."

DJ

dj_gman

Client

United Kingdom

"Working with AbuBakar has been a very pleasant experience for me. He was assigned to the backend modules for our project as a tech lead. He was tasked with discovery work for our proof of concepts, building the backend architecture and working with the Frontend team to integrate the APIs and websockets. He has done superbly in all areas of the project from definition to implementation and delivery. AbuBakar is an excellent team player and is great to work with. He has a high technical aptitude which shows when he's presenting his solution and research work! I wish him the best of luck for the future!"

SM

Shaharyar Maroof

Engineering Manager

Emumba

"I had the pleasure of working closely with Abubakar and can confidently recommend him. He's not only a seasoned professional with exceptional skills but also a source of inspiration. Abubakar's adaptability in the fast-paced world of software engineering is remarkable. His positive attitude and ability to tackle challenges with a smile set him apart. He consistently goes above and beyond to meet company standards and exceed client expectations. Abubakar's exceptional time management and crisis-handling skills make him an invaluable team member. Any group would benefit greatly from his expertise and unwavering positivity."

MH

Muhammad Hadi Saeed

Assistant Director - Product Engineering

easypaisa digital bank

"Abubakar is an exceptionally knowledgeable and skilled AWS developer who understands his clients' problems and provides proactive solutions to address them. He completed the project well ahead of schedule, Overall, I highly recommend Abubakar to anyone looking for a skilled AWS develo. Throughout the project, Abubakar was in constant communication with me, providing regular updates on his progress and addressing any questions or concerns I had promptly. His ability to communicate complex technical concepts is remarkable."

JA

javajmc

Client

Mexico

"Abubakar produced absolutely amazing work as always. He is my go to guy for anything I need. He is so attentive to every single detail in your project and makes the process so much smoother. I would recommend him to anyone if you truly want to work with a professional."

AT

attilabrisco

Repeat Client

United States

The Process

How we go from idea to scale.

1.Discovery & Architecture

Deep-diving into your business requirements, defining the system architecture, and establishing a clear technical roadmap.

2.Agile Execution

Iterative, transparent development. You get regular updates and access to staging environments to see the code come to life.

3.Delivery & Scaling

Seamless deployment, rigorous testing, and handing over a fault-tolerant system built to handle production scale.

Get in touch

Let's work together.

Have a project in mind? I'd love to hear about it. Let's create something exceptional together.

dev@abubkr.com