Software Engineer

Zachary Kublalsingh

I build reliable backend systems and polished full-stack products focused on performance, scalability, and developer experience.

Profile

About

Computer Science student and software engineer with experience shipping full-stack applications, API platforms, and automation pipelines. I focus on writing maintainable code, designing resilient services, and delivering measurable product impact through pragmatic engineering.

Selected Work

Projects

Spendi

Privacy-first personal finance platform that ingests transaction emails, normalizes records, and provides explainable spending insights.

Designed idempotent ingestion and reconciliation flows for reliable retry-safe processing, with secure authentication and auditability.

FastAPIPostgreSQLCeleryRedisAWSTypeScript

PersonaLab - NYU HACKATHON Winner 2026

Distributed AI testing tool where autonomous browser agents simulate diverse user personas across product workflows.

Implemented asynchronous job orchestration with queue-backed retries and state recovery to improve task completion reliability.

Next.jsTypeScriptRedisBullMQPrisma

Professional

Experience

Software Engineering Intern

Amazon Backed Startup - WRTH - Miami, FL

May 2026 - Present

  • Built a distributed file processing system routing CSVs through an in-process FastAPI fast path and offloading PDFs/XLSX to Databricks serverless notebooks and AWS S3 buckets for scalable parsing of large vendor inventory.
  • Designed a three-layer product matching system combining PostgreSQL catalogue lookups, and Google Lens, auto-approving rows scoring ≥90% confidence into inventory, enabling users to approve, or reject low-confidence matches.
  • Developed an end-to-end payment system supporting 6 methods via Stripe Connect and manual capture, with a 4-step React checkout backed by four serverless Edge Functions for session creation, webhooks, refunds, and manual payments.
  • Created a multi-marketplace listing transformation engine that enriches a universal item once, then repackages it perchannel so each marketplace receives data optimized for its search algorithm and required fields, not just mapped fields.

Head Teaching Assistant, Data Structures & Algorithms

New York University - New York, NY

Dec 2025 - Present

  • Managed a team of 12 course assistants, coordinating grading of exams and assignments for efficient course operations.
  • Supported 150+ students in algorithm design, runtime analysis, data structure implementation, recursion, and Python.

Network Security Intern

PPGPL - Trinidad and Tobago

Jul 2025 - Aug 2025

  • Increased vulnerability score by 1.73% by identifying, analyzing, and securing exposed ports using Nmap and hardening.
  • Improved threat detection by fine-tuning SIEM correlation rules,optimizing alert thresholds, and refining detection logic.
  • Designed and executed simulated adversarial attack scenarios including phishing simulations, external reconnaissance, and discovery of exposed admin interfaces to evaluate organizational security posture and identify high-risk entry points.
  • Translated findings from attack simulations into defensive recommendations including network segmentation, least-privilege access controls, and strengthened authentication policies to reduce attack surface and improve resilience.

Software Engineer Intern

Medical Student AI - Trinidad and Tobago

Jul 2024 - Aug 2024

  • Increased user engagement by redesigning 10+ web pages using Next.js and Tailwind CSS, improving UI/UX consistency and responsiveness, and measuring impact through increased site visits, unique visitors and session duration analytics.
  • Developed an AI-powered USMLE question bank with 2,000+ questions across 24+ topics and engineered a dynamic test generator enabling adaptive exam creation, randomized question selection, and personalized spaced repetition sessions.

Technical Stack

Skills

Languages

PythonTypeScriptJavaScriptSQLJavaC++C

Frontend

ReactNext.jsTailwind CSS

Backend

FastAPIREST APIsNode.jsCeleryRedis

Infrastructure & Tools

AWSDockerPostgreSQLGitGitHub Actions

Get In Touch

Contact

I am actively looking for software engineering internships and collaborative opportunities. Feel free to reach out.