Full-Stack Software Engineer

Nick James

I build SaaS products, automation systems, mobile apps, and data-heavy tools. Currently focused on practical product engineering: SaaS, payments, marketplace integrations, browser automation, and small systems that make operations easier.

Experience

Co-Founder and CTO @ Flippify LTD

January 2024 - Present

Led product and engineering across a seller-focused SaaS platform covering web, mobile, APIs, payments, marketplace sync, and automation.

  • Built and scaled core infrastructure for inventory, orders, analytics, billing, and seller workflows.
  • Architected backend systems for syncing inventory and orders from external marketplaces.
  • Implemented Stripe subscriptions, webhooks, access permissions, rate limiting, and Firestore rules.
  • Led cross-platform mobile app development and took part in hiring interviews.

Full Stack Engineer @ Built Tech

October 2025 - March 2026

Contract work across CRM features, social data ingestion, company website delivery, and internationalized client-facing pages.

  • Built CRM features for a client project.
  • Created an Apify ingestion pipeline for Instagram, X/Twitter, YouTube, and TikTok metrics.
  • Delivered a company website with portfolio and Calendly scheduling integration.
  • Added multi-language support across 10 languages.

Software Engineer @ Freelance

January 2022 - April 2024

Built automation and data extraction systems for clients across marketplaces, retail platforms, APIs, and Google Sheets workflows.

  • Developed web scrapers and automation tools for multiple clients.
  • Built Selenium and Playwright extraction pipelines.
  • Integrated WooCommerce, Nike, Adidas, and other APIs.
  • Automated scraped-data workflows into Google Sheets.

Projects

Flippify

Live company product

Inventory, order, expense, and analytics software for online sellers.

React Native / Expo / Next.js / FastAPI / Flask / Firebase

VulpineOS

Open-source platform

A browser-agent runtime for managing secure AI browsing sessions at scale.

Go / React / MCP / Docker / WebSocket / Camoufox

TaskTree

Product build

A monday.com Board View app for deep task hierarchies and drag-and-drop planning.

Next.js / TypeScript / dnd-kit / Supabase / monday SDK / GraphQL

Karsilo

B2B SaaS

Multi-entity Stripe analytics and payment reporting for organizations.

Next.js / React / TypeScript / Firebase / NextAuth / Stripe Connect

Salkaro Portal

Platform work

A secure client portal for sharing project progress without extra tool seats.

Next.js / TypeScript / Tailwind / Stripe / Linear / monday.com

Fera Academy

Education product

A structured learning platform with course navigation, search, and physics content.

Next.js / React / TypeScript / Turborepo / Tailwind / Docs architecture

Salkaro Upload

Utility product

QR-based upload rooms for moving files between devices quickly.

Next.js / React / TypeScript / Chakra UI / Supabase / Socket.io

Salkaro Tasks

Developer tooling

A VS Code sidebar extension for AI task planning and execution.

TypeScript / VS Code API / Claude SDK / Webviews / Node.js

Simulation Labs

Academic project

Interactive Python simulations for soft bodies, optics, and physical models.

Python / Numerical simulation / Desktop apps / Physics

M3 Challenge Paper

26th of 643 teams

Honourable Mention paper modeling drivers of homelessness under time pressure.

Regression / Mathematical modeling / Research writing / Team delivery

Skills

Product frontend

Interfaces for dashboards, workflows, onboarding, and mobile apps.

Next.js / React / React Native / Expo / TypeScript / Chakra UI / Tailwind / shadcn

Backend and APIs

Services, auth flows, webhooks, and integration-heavy product logic.

Python / FastAPI / Flask / Node.js / Go / REST APIs / OAuth / Rate limiting

Payments and data

Billing, reporting, analytics, storage, and financial workflows.

Stripe / Stripe Connect / Firebase / Firestore / Supabase / MongoDB / Recharts

Automation and systems

Data extraction, browser automation, and runtime/control-plane work.

Playwright / Selenium / Apify / BeautifulSoup / MCP / Docker / WebSocket / Browser automation

Achievements

M3 Challenge Honourable Mention

Placed 26th of 643 teams with a mathematical modeling paper on homelessness drivers.

A-Level results

A* in Physics, Mathematics, and Further Mathematics, plus A in Computer Science.

Product leadership

Co-founder and CTO experience spanning product architecture, hiring, and end-to-end delivery.

Contact

If the problem involves a product surface, data flow, automation workflow, or payment/integration boundary, I am useful early.

nick.business@mail.com