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Sjjs Snne

@sjjssnne

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Senior Full-Stack Engineer building scalable web applications with React, Node.js, and Python.

United States

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What I'm looking for

I seek roles where I can design scalable cloud-native systems, lead engineering best practices, mentor teams, and deliver high-performance full-stack solutions in collaborative environments.

I am a Senior Full-Stack Engineer with 7+ years designing and delivering scalable, high-performance web applications across React/Next.js, Node.js, and Python (FastAPI/Flask). I focus on clean, modular architectures, robust APIs, and UI performance to create seamless user experiences.

At Appier I architected microservice-based APIs, implemented GraphQL gateways, built a shared React+TypeScript component library, and designed ingestion pipelines on AWS processing millions of records per day — delivering major latency and delivery-speed improvements.

I bring strong cloud-native experience (Docker, Kubernetes, AWS), deep database and observability skills, and a collaborative approach to mentorship, code review, and cross-team delivery to drive technical excellence across the full development lifecycle.

Experience

Work history, roles, and key accomplishments

Senior Software Engineer

Appier

May 2023 - Dec 2024 (1 year 7 months)

Developed and maintained full-stack web applications using React, FastAPI, and PostgreSQL; architected microservice APIs and GraphQL gateways, cutting response latency by 40% and increasing feature delivery speed by 30%.

React fastAPI PostgreSQL GraphQL Docker Kubernetes AWS Lambda OAuth 2.0 GitHub Actions

Full-Stack Engineer

ActionTrails

Mar 2021 - Apr 2023 (2 years 1 month)

Built scalable backend APIs in Node.js and FastAPI and re-engineered React front-end, reducing API overhead by 35% and lowering critical endpoint latency to <500ms via async workers.

Node Express fastAPI React React Query AWS ECS Terraform GitHub Actions

Software Engineer

Distributed

Feb 2019 - Feb 2021 (2 years)

Built internal workflow tools and API middleware, refactored batch jobs into async queues to handle thousands of events, and introduced testing automation achieving 80% coverage on critical services.

React Python Redis BullMQ AWS Lambda ELK Stack Pytest Jest

Education

Degrees, certifications, and relevant coursework

University of Alicante

Bachelor of Science, Computer Science

2014 - 2018

Completed a Bachelor of Science in Computer Science with coursework and projects focused on software engineering, web development, and systems design.