Hello, I'm

Ahmad Al Mezaal

Building resilient, cloud-native systems at scale

Contact Me
Download CV
Scroll Down

About Me

Get to know me better - my background, passions, and what drives me

AAM
London, United Kingdom

Senior Software Engineer with strong experience designing, building, and scaling backend and full-stack systems in high-growth startup environments. Specialised in fintech and open banking, with a proven track record delivering secure, high-performance APIs, event-driven architectures, and third-party integrations at scale. I focus on building resilient, cloud-native systems on AWS, designing data pipelines for deduplication, enrichment, and orchestration, while balancing technical excellence with product and business impact. I own systems from concept to production.

6+
Years Experience
20+
Projects Completed
10+
Clients Served
15+
Technologies Used

Skills & Expertise

Technologies and tools I use to bring ideas to life

Backend & Data

Node.js / NestJSTypeScriptPostgreSQLMongoDBAPI DesignEvent-Driven Systems

Cloud & DevOps

AWS (Lambda, SQS, RDS, etc.)DockerKubernetes / EKSTerraformCI/CD Pipelines

Frontend & Mobile

ReactReact NativeReduxNext.js

Work Experience

My professional journey and career highlights

Senior Software Engineer

Borderless
London, UK
Nov 2025 - Present· 2 mos

Architecting AI-driven features and automating complex immigration workflows for a high-autonomy visa processing platform.

Architected AI-driven features using OpenAI and Anthropic APIs, automating complex immigration workflows and enabling semantic search to reduce manual data entry
Championed AI-native development, leveraging LLM workflows to accelerate feature delivery and prototype autonomous agents for high-autonomy platform logic
Partnered with Product teams to translate intricate UK immigration policies into scalable backend logic, driving the platform's ability to process visas autonomously
Engineered resilient integrations with third-party HR systems and Stripe, automating complex financial flows including invoicing and card issuance
Enhanced system reliability and performance by implementing comprehensive monitoring, optimizing database queries, and reducing latency for data-heavy dashboards

Senior Software Engineer

Shuffle Finance
London, UK
Aug 2024 - Oct 2025· 1 yr 3 mos

Building and scaling Open Banking APIs and data pipelines in a high-growth fintech environment.

Built Open Banking APIs processing 10M+ transactions/month with 99.99% uptime
Designed transaction deduplication and enrichment pipelines, improving data accuracy by 35%
Introduced hybrid serverless + containerised architecture, reducing costs by 20% and increasing throughput by 40%
Implemented monitoring and alerting, reducing incident response time from hours to minutes
Collaborated with product/design to prioritise features, ensuring engineering decisions directly supported faster feature delivery and higher customer satisfaction.
ZIM Connections

2 roles · Career progression

London, UK
Sep 2021 - Aug 2024· 3 yrs

Lead Software Engineer

Apr 2022 - Aug 2024· 2 yrs 5 mos

Led a team of engineers building backend services and mobile applications for a global eSIM platform.

Led team of 3 engineers, increasing delivery velocity by 40%
Architected backend services and React Native apps supporting 100k+ users worldwide
Optimised PostgreSQL and MongoDB queries, reducing API response times by 50%
Integrated Stripe payments and eSIM provider APIs, enabling 200k+ secure transactions
Built CI/CD pipelines accelerating release cycles by 70%

Full-Stack Engineer

Sep 2021 - Apr 2022· 8 mos

Built and maintained scalable applications using Node.js, React.js, and React Native.

Improved API performance by 30% through indexing and query optimisation
Integrated multiple third-party APIs (authentication, payments, eSIM)
Established Jest testing framework, raising unit test coverage to 80%
Supported smooth deployments via CI/CD automation

Product Engineer (Open Source)

DeSofy
Remote
Jan 2021 - Dec 2021· 1 yr

Delivered product and performance enhancements to a crypto-focused social platform.

Delivered 25+ product and performance enhancements
Implemented mintable posts, optimised pagination, and real-time chat in React Native
Reverse-engineered and integrated external APIs, increasing DAUs by 20%

Mobile Developer

HelloTree
Jounieh, Lebanon
Jul 2020 - Jan 2021· 7 mos

Built and launched client-facing web and mobile applications.

Built and launched 4 client-facing web and mobile apps
Optimised React Native sailing app, reducing load times by 30%
Collaborated with clients and designers to deliver production-ready features

Lecturer

Geek Express
Beirut, Lebanon
Aug 2019 - Jul 2020· 1 yr

Delivered hands-on instruction in web development technologies.

Taught HTML, CSS, JavaScript, and Bootstrap to aspiring developers
Mentored students through real-world projects, improving completion rates by 25%+
Designed structured lesson plans and debugging guides

Featured Projects

Some of my recent work that I'm proud of

Featured

Open Banking Platform

High-performance Open Banking APIs processing 10M+ transactions monthly with 99.99% uptime, powering customer rewards and financial insights.

Node.jsAWSPostgreSQLEvent-Driven
Featured

Global eSIM Platform

Backend services and React Native mobile apps supporting 100k+ users worldwide with integrated payments and eSIM provisioning.

React NativeNode.jsStripeMongoDB
Featured

Transaction Data Pipeline

Scalable data pipeline for transaction deduplication and enrichment, improving data accuracy by 35% for user-facing insights.

AWS LambdaSQSDynamoDBTypeScript

Get In Touch

Have a project in mind? Let's work together to bring your ideas to life

Email

ahmad.hmazaal@gmail.com

Location

London, United Kingdom

Connect with me

Education

BSc in Computer Science

American University of Science & Technology

Feb 2018 - Jun 2021

Certifications

DevOps & Cloud (Docker, Kubernetes, Terraform, Ansible) - Simplilearn

Send me a message

Fill in the details below and click to open your email client

Book a Chat