Full Stack Software Engineer specialising in React, Next.js, TypeScript, PostgreSQL, APIs and n8n automation. I’m Sean Walker, a UK developer with 20+ years of experience building web applications, data platforms and business systems. Most recently, I designed, developed and launched Pinloco end-to-end — a production React/Next.js platform serving 7,300+ business listings, backed by PostgreSQL, Stripe integrations, REST APIs and self-hosted n8n workflows. The platform was architected, built and deployed entirely by me. My strengths span the full stack, from frontend development and backend services through to database design, system integration, API development and workflow automation. I’m equally comfortable building customer-facing products, internal tools and connected systems that rely on APIs, webhooks and automated processes. I enjoy taking ownership of projects from architecture and development through to deployment and ongoing operation, with a focus on delivering reliable, maintainable software that solves real business problems. Technical Skills & Areas of Expertise * React * Next.js * TypeScript * JavaScript * Node.js * PostgreSQL * Supabase * REST APIs * API Integration * Webhooks * n8n * Workflow Automation * Business Automation * Stripe Integration * SaaS Platforms * Web Application Development * Dashboard Development * Internal Tools * Data Pipelines * System Integration * CRUD Applications * React Native * Mobile App Development * OAuth…

Sean Walker - UK, Remote

Full Stack Software Engineer specialising in React, Next.js, TypeScript, PostgreSQL, APIs and n8n automation. I’m Sean Walker, a UK developer with 20+ years of experience building web applications, data platforms and business systems. Most recently, I designed, developed and launched Pinloco end-to-end — a production React/Next.js platform serving 7,300+ business listings, backed by PostgreSQL, Stripe integrations, REST APIs and self-hosted n8n workflows. The platform was architected, built and deployed entirely by me. My strengths span the full stack, from frontend development and backend services through to database design, system integration, API development and workflow automation. I’m equally comfortable building customer-facing products, internal tools and connected systems that rely on APIs, webhooks and automated processes. I enjoy taking ownership of projects from architecture and development through to deployment and ongoing operation, with a focus on delivering reliable, maintainable software that solves real business problems. Technical Skills & Areas of Expertise * React * Next.js * TypeScript * JavaScript * Node.js * PostgreSQL * Supabase * REST APIs * API Integration * Webhooks * n8n * Workflow Automation * Business Automation * Stripe Integration * SaaS Platforms * Web Application Development * Dashboard Development * Internal Tools * Data Pipelines * System Integration * CRUD Applications * React Native * Mobile App Development * OAuth…

Available to hire

Full Stack Software Engineer specialising in React, Next.js, TypeScript, PostgreSQL, APIs and n8n automation.

I’m Sean Walker, a UK developer with 20+ years of experience building web applications, data platforms and business systems.

Most recently, I designed, developed and launched Pinloco end-to-end — a production React/Next.js platform serving 7,300+ business listings, backed by PostgreSQL, Stripe integrations, REST APIs and self-hosted n8n workflows. The platform was architected, built and deployed entirely by me.

My strengths span the full stack, from frontend development and backend services through to database design, system integration, API development and workflow automation. I’m equally comfortable building customer-facing products, internal tools and connected systems that rely on APIs, webhooks and automated processes.

I enjoy taking ownership of projects from architecture and development through to deployment and ongoing operation, with a focus on delivering reliable, maintainable software that solves real business problems.

Technical Skills & Areas of Expertise

  • React
  • Next.js
  • TypeScript
  • JavaScript
  • Node.js
  • PostgreSQL
  • Supabase
  • REST APIs
  • API Integration
  • Webhooks
  • n8n
  • Workflow Automation
  • Business Automation
  • Stripe Integration
  • SaaS Platforms
  • Web Application Development
  • Dashboard Development
  • Internal Tools
  • Data Pipelines
  • System Integration
  • CRUD Applications
  • React Native
  • Mobile App Development
  • OAuth
See more

Skills

Experience Level

SQL
Expert
TypeScript
Expert
React Native
Expert
SaaS
Expert
PostgreSQL
Expert
JavaScript
Expert
n8n
Expert
Node.js
Expert
Python
Intermediate

Language

English
Fluent

Work Experience

Founder / Full Stack Software Engineer at Pinloco
July 1, 2025 - Present
Architected and built a full-stack hyperlocal CRM-style platform from scratch: React/Next.js PWA frontend, PostgreSQL/Supabase backend, and a multi-tier subscription system managing customer lifecycle and engagement data for 7,300+ businesses. Designed and implemented RESTful APIs and server-side data services with PostGIS spatial queries and RPC functions for fairness-based sponsor rotation. Built a webhook-driven automation layer integrating Stripe subscriptions, n8n workflow pipelines, and transactional emails — processing payment events, status changes, and onboarding flows without application-layer coupling. Engineered a scraping and data pipeline (ScrapingDog, OpenAI, n8n) to ingest, classify, enrich, and store 7,300+ business records across 55+ neighbourhoods. Delivered analytics dashboards and reporting views for business owners and platform admins, with engagement tracking, impression logging, and subscription metrics. Owned the full delivery lifecycle: architecture decision
Data & Tech Command Developer at Cumbria Constabulary HQ
July 1, 2024 - September 1, 2025
Migrated data warehousing onto Azure Synapse Analytics — building linked services, ingestion pipelines, transformation workflows, and Power BI reporting. Explored Microsoft Fabric and Lakehouse architectures to improve platform scalability and reporting capability.
Migration Analyst Developer at FNZ Group (Global Fintech)
February 1, 2022 - July 1, 2024
Delivered ETL data migration solutions for a global fintech platform, working with client SMEs to map, validate, and migrate business-critical customer account data in an agile environment. Built and maintained SQL Server pipelines where accuracy, traceability, and controlled delivery were essential — processing large financial datasets with zero tolerance for error.
Director at Letterbox Smart Ltd
December 1, 2015 - September 1, 2021
Founded and operated a distribution business with up to 20 staff, managing IT systems, operational processes, and commercial delivery to 100,000+ households monthly.
BI Data Specialist at Sellafield Ltd
January 1, 2014 - December 31, 2015
Delivered business intelligence and data solutions supporting critical operations at Sellafield through data analysis, reporting, and data quality initiatives.
Software Engineer at Capula Nuclear Ltd
January 1, 2011 - December 31, 2012
Developed software solutions for nuclear industry control systems, focusing on reliability, performance, and safety-compliant software engineering practices.
Operational Research Analyst at Sellafield Ltd
January 1, 2009 - December 31, 2014
Applied operational research methods to optimize processes, resource allocation, and project delivery in a high-stakes environment.
eCommerce Solutions Provider at Self-Employed
January 1, 2003 - December 31, 2009
Provided end-to-end eCommerce and software solutions for clients, including site development, integrations, and data workflows.
SQL Database Developer at Halliwell Landau / Weightman Vizards
January 1, 2000 - December 31, 2003
Designed and maintained SQL databases for clients, focusing on data integrity, performance, and reporting.

Education

BTEC National Diploma in Computer Studies at WCC, Workington, Cumbria
January 1, 1997 - December 31, 1999
BTEC National Diploma in Computer Studies at WCC, Workington, Cumbria
January 1, 1997 - January 1, 1999

Qualifications

Microsoft Certified: DP-600 Fabric Analytics Engineer
January 1, 2024 - December 31, 2024
Microsoft Certified: DP-601 Fabric Data Lakehouse
January 1, 2024 - December 31, 2024
Microsoft Certified: DP-605 Power BI Reporting
January 1, 2024 - December 31, 2024
QlikView Certified Designer & Developer
January 1, 2024 - December 31, 2024
Microsoft Certified: DP-600 Fabric Analytics Engineer
January 1, 2024 - June 9, 2026
Microsoft Certified: DP-601 Fabric Data Lakehouse
January 1, 2024 - June 9, 2026
Microsoft Certified: DP-605 Power BI Reporting
January 1, 2024 - June 9, 2026
QlikView Certified Designer & Developer
January 1, 2024 - June 9, 2026
Primavera P6 Project Management
January 11, 2030 - June 9, 2026
Esri ArcGIS Spatial Analysis
January 11, 2030 - June 9, 2026

Industry Experience

Software & Internet, Professional Services, Financial Services, Government, Education, Energy & Utilities, Retail
    Built and launched a live SaaS platform serving 7,800+ businesses as a solo developer

    Designed, developed and launched Pinloco — a live hyperlocal SaaS platform and Progressive Web App serving 7,800+ business listings across multiple UK locations.

    Built entirely from scratch using React, Next.js, TypeScript, PostgreSQL and Node.js, with Stripe subscription billing, REST API integrations and self-hosted n8n workflow automation. The platform includes business onboarding, content generation, analytics dashboards, sponsor management and automated data pipelines.

    Key areas of responsibility:

    • Full system architecture and database design
    • React / Next.js frontend development
    • PostgreSQL schema design and optimisation
    • REST APIs, webhooks and third-party integrations
    • Stripe subscription and payment workflows
    • n8n automation and business process automation
    • Analytics, reporting and dashboard development
    • PWA deployment for iOS and Android

    A real production platform designed, built and operated end-to-end by a single developer.

    Live project: https://www.twine.net/signin