Hey,
My name is Seraphim Sakiewicz

I build things for the web

About Me

4+ years of experience in the industry and I have built applications for the insurance, sustainability, and financial industries.

Full‑Stack engineer specializing in React, Node, TypeScript, and AWS (Lambda, DynamoDB, OpenSearch, StateMachines).

Sparta, New Jersey - Remote

July 2023 - Prsent

Built an AWS S3-backed CMS using React and Node.js, saving devs ~20 hours/week.
Migrated 100+ jQuery pages to modern React components using TypeScript and MUI.
Delivered fully-tested UI features using React Testing Library and Jest, achieving 99% test coverage.
Created calculators and quiz tools with React Reducer and MUI to improve engagement.
Conducted 200+ code reviews and enhanced GitLab CLI pipelines for smoother deploys.

Marsa, Malta - Remote

March 2022 - July 2023

Built a Node.js/Express API hosted on AWS Lambda for invoice integration with Xero and Sage.
Optimized AWS Step Functions to process invoices ~40% faster using recursion and caching.
Developed a React + TypeScript admin portal that reduced admin costs by ~50%.
Decreased bugs by ~20% via Cypress and Jest testing across edge cases.
Mentored junior developers on how React works and walked them through the codebase.

Moscow, Russia - Hybrid

March 2021 - March 2022

Built React modules for AdInsure's quoting and onboarding interface.
Used Node.js and Puppeteer to auto-generate contracts and cut processing time.
Added JavaScript validation layers to form workflows, reducing bug rates.
Wrote SQL queries to retrieve core data from the MySQL database.
Improved confidence in release cycles by reaching 90% test coverage with Mocha.