Hi, my name is

Oscar Lagatta.

I build enterprise-grade platforms.

Lead front-end engineer specialising in large-scale financial and trading platforms. Currently architecting real-time payment monitoring systems at Bank of America. Based in London, UK.

View My Work

01.About Me

I am a lead front-end engineer with deep expertise in building large-scale financial and trading platforms for major institutions including Bank of America, London Stock Exchange Group, and Marks & Spencer. My career has been defined by delivering greenfield enterprise systems and architecting high-performance, data-intensive front-end solutions that serve high-volume enterprise users.

I specialise in React and Angular ecosystems, with deep experience in NX monorepos, API-driven architectures, reusable component libraries, and real-time operational dashboards. As a proven technical lead, I drive migrations, implement robust testing and CI practices, and mentor cross-functional teams to improve reliability, performance, and developer productivity.

I hold a Bachelor of Business Administration in Management Information Systems from CAECE University and am fluent in English, Spanish, and Italian — enabling me to work effectively in multilingual, globally distributed teams.

Technologies I work with:

ReactAngularTypeScriptNX MonorepoTailwindCSS.NET / ASP.NET CoreTanStack QueryAG GridRechartsReact FlowShadCNNgRxRxJSCypressPlaywrightCucumberFormikAxios

6+

Enterprise Clients

Tier-1 organisations

5+

Years as Tech Lead

Leading engineering teams

React & Angular

Dual Framework Expert

Full-spectrum front-end

London, UK

Based & Available

Open to contract roles

Languages
English(Fluent)Spanish(Native)Italian(Fluent)

02.Where I've Worked

React Senior Developer @ Bank of America

Sept 2024 — Present · London

  • Architecting an enterprise end-to-end payment flow monitoring and visualisation platform providing real-time visibility across global payment systems (US, APAC, EU transaction flows).
  • Designing interactive node-based system flow visualisations enabling operations teams to track payment routing, lifecycle status, dependencies, and failure points across the banking ecosystem.
  • Building a Scorecard analytics platform supporting internal performance monitoring and operational decision-making through real-time dashboards and complex data aggregation pipelines.
  • Integrating multiple backend services and observability sources (Splunk, internal APIs) to create unified operational dashboards for investigation and regulatory monitoring.
  • Building high-performance data-intensive UI using React, TanStack Query, AG-Grid, and Recharts to support large-volume enterprise data analysis.
  • Architecting reusable domain, UI, and data libraries within an NX monorepo, enabling scalable multi-application enterprise development.
ReactTanStack QueryAG-GridRechartsReact FlowNX MonorepoPlaywrightCucumberOpenAPI

03.Projects & Case Studies

Bank of America

Global Payment Flow Monitor

ReactTanStack QueryAG-GridReact FlowRechartsNX Monorepo

Enterprise end-to-end payment flow monitoring and visualisation platform providing real-time visibility across global payment systems. Supports US, APAC, and EU transaction flows with interactive node-based system flow visualisations for tracking payment routing, lifecycle status, dependencies, and failure points.

Real-time global transaction monitoring
Node-based flow visualisation
Unified observability dashboards
Bank of America

Scorecard Analytics Platform

ReactTanStack QueryRechartsAG-GridPlaywrightCucumber

Internal performance monitoring and operational decision-making platform built with complex data aggregation pipelines. Provides real-time dashboards for investigation and regulatory monitoring across multiple backend services and observability sources.

Complex data aggregation pipelines
Regulatory compliance monitoring
E2E tested with Playwright
London Stock Exchange Group

Enterprise Trading Platform Migration

Angular 16NX.NETTypeScriptNgRx

Led the front-end architecture and migration of legacy enterprise trading-related applications to a modern Angular 16 + NX architecture. Defined technical architecture, development standards, and engineering delivery strategy across globally distributed teams.

Legacy to modern architecture migration
Multi-team engineering standards
Global delivery coordination
Whistl

Enterprise Logistics Platform

ReactReact QueryTypeScriptFormik

Complete redevelopment of enterprise operational systems used across high-volume logistics operations. Architected scalable React platforms supporting multiple internal applications and complex operational workflows with enterprise-grade data validation.

High-volume logistics operations
Multi-application architecture
Enterprise data validation
Marks & Spencer

Sparks Loyalty Platform

AngularCypressCucumberTypeScript

Led development of internal enterprise applications supporting the Sparks loyalty and commercial platforms. Established comprehensive testing strategies and promoted Agile best practices to improve platform reliability and delivery quality.

Loyalty programme management
Comprehensive test automation
Agile delivery leadership
Homes England

Help to Buy & Affordable Housing Portal

Angular.NETAzureTypeScript

Public-facing and client internal-facing applications dedicated to supporting Help to Buy and Affordable Housing government initiatives. Integrated Angular with .NET backend services and managed Azure cloud infrastructure.

Public-facing government portal
Azure cloud infrastructure
.NET backend integration

04. What's Next?

Get In Touch

I am currently open to new contract opportunities within the UK market. Whether you have a challenging enterprise front-end project, need technical leadership for a platform migration, or just want to connect, I would love to hear from you.

Say Hello+44 07557 476 002
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