Jehanzeb Qayyum, Developer in London, United Kingdom
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Jehanzeb Qayyum

Verified Expert  in Engineering

Software Developer

London, United Kingdom

Toptal member since June 21, 2022

Expertise
JavaKotlinAWSTerraformKubernetesSpringJavaScriptMacOSNode.jsAngularReact.jsPostgreSQLOracle DevelopmentDevOps
Bio

Jehanzeb is a hands-on software engineering lead with a proven track record of successfully delivering large-scale enterprise projects. He's led technical transformations focused on microservices, DevOps, CI/CD, cloud-native development, test automation, design patterns, and security. Jehanzeb can manage a team using Agile methodologies and motivate individuals to take up complex challenges and deliver high-quality products while maintaining effective communication with stakeholders.

Portfolio

Delivery Hero
Amazon Web Services (AWS), Kotlin, JavaScript, Amazon DynamoDB, PostgreSQL
Emirates Group
Amazon Web Services (AWS), Java, Node.js, Angular, React
Etisalat UAE
Java, Oracle, Spring

Experience

  • Java - 10 years
  • Spring - 6 years
  • Kotlin - 3 years
  • Node.js - 3 years
  • Terraform - 2 years
  • Amazon Web Services (AWS) - 2 years
  • Kubernetes - 2 years
  • Spinnaker - 2 years

Availability

Part-time

Preferred Environment

MacOS, Java, Kotlin, Amazon Web Services (AWS), DevOps, Kubernetes, PostgreSQL

The most amazing...

...projects I've built include a vendor management service scaled for millions of restaurants and a flight departure control system to manage check-in/check-out.

Work Experience

Senior Software Engineer

2020 - PRESENT
Delivery Hero
  • Developed a master data management service for vendors to act as a single source of truth for the rest of the services, scaling for millions of vendors.
  • Solved the C10k issue, handling many clients with minimal resources using a reactive Kotlin stack.
  • Improved search performance by 100% on PostgreSQL trigram search.
  • Improved the robustness of message publishing by implementing an outbox pattern on PostgreSQL logical replication and DynamoDB Kinesis streams.
  • Worked on AWS, DynamoDB, Aurora, SQS, SNS, and Kineses. Built CI/CD pipelines using Drone and Spinnaker. Handled infrastructure as a code in Terraform. Deployed helm charts applications in Kubernetes. Used Prometheus and Grafana for observability.
  • Hired, mentored, and technically led other engineers. Took cross-team initiatives such as conducting various chapters and guilds.
  • Implemented various agile practices such as TDD, BDD, E2E tests, load tests, and chaos engineering.
Technologies: Amazon Web Services (AWS), Kotlin, JavaScript, Amazon DynamoDB, PostgreSQL

Senior Technical Engineer

2017 - 2020
Emirates Group
  • Architectured multiple microservices transformation projects applying DDD and CQRS patterns.
  • Implemented DevOps practices by creating CI/CD pipelines using Jenkins. Performed test automation, dockerized in Kubernetes, and monitored with Prometheus and ELK.
  • Executed unit, automation (BDD), security and performance test suites, and A/B. tests. Integrated into pipelines using JUnit, REST Assured, Cucumber, Selenium, Sinon, Chai, Mocha, OWSAP, and JMeter.
  • Built continuous code quality metrics in every development step, including pre-commits, PR jobs, SonarLint, and coverage analysis.
  • Recruited, trained, and managed two teams of approximately five engineers each.
  • Effectively liaised with stakeholders like product owners and customers,. conducting requirement analysis sessions, backlog prioritization, dependency resolutions, and customer workshops.
Technologies: Amazon Web Services (AWS), Java, Node.js, Angular, React

Technical Development Lead

2014 - 2017
Etisalat UAE
  • Technically led the development of in-house BSS applications supporting customer, order, and product management, spearheading a team of four engineers.
  • Developed the systems following microservices and event-driven architecture using Spring Boot, Java 8, Angular 4, Oracle, and AWS (S3, Lambda, EC2, and VPC).
  • Achieved performance and other nonfunctional benchmarks by optimizing code, resources, and data access.
  • Provided technical mentoring and led the team in the Agile Scrum methodology.
Technologies: Java, Oracle, Spring

Experience

Vendor Management APIs

I developed master data management APIs for restaurants, scaling for millions. I also deployed them in AWS using DynamoDB, PostgreSQL, SQL, and SNS. The infrastructure as a code was managed by Terraform, packaged as helm charts in Kubernetes.

Education

2002 - 2006

Bachelor's Degree in Computer Science

National University of Computer and Emerging Sciences - Lahore, Pakistan

Skills

Libraries/APIs

Node.js, React

Tools

Terraform

Languages

Java, Kotlin, JavaScript

Platforms

Amazon Web Services (AWS), Spinnaker, Kubernetes, MacOS, Oracle

Frameworks

Angular, Spring

Paradigms

DevOps

Storage

Amazon DynamoDB, PostgreSQL, Oracle9i

Other

Computer Science, PostgreSQL 9, Reactive Streams

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