Software Development Engineer · AWS

Building systems that have to be right, every time.

I'm a software engineer based in Seattle working on distributed backend infrastructure where correctness isn't a nice-to-have — it's the whole job. Currently at AWS, working on infrastructure, security, and reliability for global tax computation systems.

About

A bit about me

I graduated from the University of Arizona with a B.S. in Software Engineering and now work at AWS on tax and invoicing infrastructure that processes millions of transactions worldwide — a domain where a single bad computation has real financial consequences, so correctness and reliability come first in everything I build.

That same instinct for correctness shows up across my work: from formally verifying tax rule changes with SMT solvers, to designing idempotent APIs that can never double-charge a customer, to leading my senior capstone team in building an AI-assisted patient monitoring system alongside biomedical and computer engineers. I like problems where being "mostly right" isn't good enough.

Jorge Lujan
Experience

Where I've worked

Selected Work

Case studies

Infrastructure AWS CDK

Tax Computation Infrastructure

Owned the infrastructure foundation — networking, security, reliability, and idempotency — for a platform computing tax on cloud transactions worldwide.

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Correctness Cross-team Leadership

International Tax Workflow Migration

Led the migration of live international tax workflows onto modernized infrastructure, reducing rounding issues and increasing calculation accuracy.

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Customer Experience HLD/LLD

Unified Invoicing Consolidation

Authored the high- and low-level designs to consolidate dual invoicing into a unified customer experience across international markets, including Brazil.

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Formal Verification SMT Solvers

SMT-Based Rule Evaluator

Built a formal verification tool that catches tax rule regressions before deployment, processing ~2.25M rule evaluations per release.

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AI Tooling Spec-Driven Dev

Spec-Driven AI Agent Tooling

Built and drove team-wide adoption of a suite of AI agent skills that automate operational and development workflows.

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Computer Vision NLP Capstone

Smart Patient Exam Room

Senior capstone project: an AI-assisted exam room that tracks patient movement, mood, and speech to help doctors catch what a visit might miss.

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Skills

What I work with

Programming

JavaPythonTypeScriptCC++

AWS & Infrastructure

LambdaStep FunctionsDynamoDBECS Fargate SQS/SNSRoute 53VPCALB/TLSIAM CloudWatchSSMAthenaAWS CDK

Distributed Systems & Architecture

Distributed Systems DesignMicroservices System & API Design (HLD/LLD)Idempotency CachingMulti-Tenancy

Security

AuthN/AuthZLeast-Privilege IAMAppSecRate Limiting & Throttling

Testing & Reliability

Parity TestingShadow TestingLoad TestingCanary-Based Regression Detection

Domain & Emerging

Tax Computation & Invoicing at ScaleInternational Tax Compliance SMT Solvers & Formal VerificationSpec-Driven AI Agent Tooling
Contact

Let's talk

Based in Seattle, WA. Open to connecting about roles, systems, or anything correctness-critical.