Open to opportunities

Simon Mall

@simonmall

Senior Backend Engineer (9+ years) building scalable TypeScript/Node.js microservices and high-performance APIs for mission-critical products.

United States

Message

What I'm looking for

I’m looking for a senior backend role where I can architect event-driven TypeScript services, optimize latency at scale, and own API reliability with strong observability, CI/CD, and product impact.

I’m a Senior Backend Engineer with 9+ years of hands-on experience building scalable backend systems across healthcare, financial services, insurance, and e-commerce. I’ve architected high-performance APIs handling 10M+ daily requests, optimized performance by 70%, and delivered mission-critical services with 99.9% uptime and sub-100ms P95 latency.

I specialize in TypeScript and Node.js, with deep expertise in Express.js and NestJS, microservices architecture, and asynchronous programming. I build secure, well-documented REST and GraphQL APIs (JWT/Auth0/Passport.js, Swagger/OpenAPI), implement type-safe data access with TypeORM/Prisma on PostgreSQL/MySQL/MongoDB, and design reliable event-driven systems using RabbitMQ and Kafka—backed by strong testing (Jest/Supertest) and observability (Prometheus/Grafana, structured logging).

Experience

Work history, roles, and key accomplishments

Current

Senior Backend Engineer

Current

Amazon Web Services (AWS)

Aug 2021 - Present (4 years 10 months)

Architected a healthcare backend on TypeScript/NestJS microservices serving 50K+ daily users with 10M+ API requests, achieving 99.9% uptime and sub-100ms p95 latency. Built insurance claims and GraphQL capabilities, reduced database queries by 65% and query execution time by 80%, and processed 2M+ RabbitMQ events hourly with exactly-once delivery.

TypeScript NestJS Microservices Architecture TypeORM PostgreSQL RabbitMQ Type GraphQL

Backend Developer

Wave Stream

Sep 2017 - Jul 2021 (3 years 10 months)

Built financial services backend with type-safe REST APIs in TypeScript/Express, supporting 100K+ monthly users with 99.5% uptime. Implemented TypeORM data layers, asynchronous job processing with Bull Queue, and Redis caching that reduced response time by 55%, alongside JWT auth and WebSocket real-time features.

TypeScript TypeORM PostgreSQL Redis Passport.Js (JWT)Socket.IO WebSockets

Software Engineer - Backend

Techpoint Global

Jun 2016 - Aug 2017 (1 year 2 months)

Developed backend REST APIs using Node.js/Express and TypeScript with CRUD endpoints, validation, and authentication via Passport (local strategy and JWT). Implemented TypeORM models with PostgreSQL, delivered unit tests with Jest/Supertest achieving 75% coverage, and deployed to AWS EC2 using PM2.