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I am Nathan Colley, a Senior Software Engineer with over a decade of experience in developing and launching SaaS and enterprise platforms. Specializing in React frontends and secure, scalable Postgres backends, I have a proven track record in backend hardening, tenant isolation, and integrating complex payment systems like Stripe Connect. My expertise extends to refactoring legacy and AI-generated code, ensuring systems are maintainable and compliant with data privacy standards. I excel in delivering pragmatic architecture solutions and optimizing codebases for performance and security, making me well-suited for roles that demand high-quality, production-ready software solutions.…I am Nathan Colley, a Senior Software Engineer with over a decade of experience in developing and launching SaaS and enterprise platforms. Specializing in React frontends and secure, scalable Postgres backends, I have a proven track record in backend hardening, tenant isolation, and integrating complex payment systems like Stripe Connect. My expertise extends to refactoring legacy and AI-generated code, ensuring systems are maintainable and compliant with data privacy standards. I excel in delivering pragmatic architecture solutions and optimizing codebases for performance and security, making me well-suited for roles that demand high-quality, production-ready software solutions.

Nathan Colley

Web Developer, Front-End Developer, Back-End Developer, +2

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I am Nathan Colley, a Senior Software Engineer with over a decade of experience in developing and launching SaaS and enterprise platforms. Specializing in React frontends and secure, scalable Postgres backends, I have a proven track record in backend hardening, tenant isolation, and integrating complex payment systems like Stripe Connect. My expertise extends to refactoring legacy and AI-generated code, ensuring systems are maintainable and compliant with data privacy standards. I excel in delivering pragmatic architecture solutions and optimizing codebases for performance and security, making me well-suited for roles that demand high-quality, production-ready software solutions.…I am Nathan Colley, a Senior Software Engineer with over a decade of experience in developing and launching SaaS and enterprise platforms. Specializing in React frontends and secure, scalable Postgres backends, I have a proven track record in backend hardening, tenant isolation, and integrating complex payment systems like Stripe Connect. My expertise extends to refactoring legacy and AI-generated code, ensuring systems are maintainable and compliant with data privacy standards. I excel in delivering pragmatic architecture solutions and optimizing codebases for performance and security, making me well-suited for roles that demand high-quality, production-ready software solutions.

Available to hire

I am Nathan Colley, a Senior Software Engineer with over a decade of experience in developing and launching SaaS and enterprise platforms. Specializing in React frontends and secure, scalable Postgres backends, I have a proven track record in backend hardening, tenant isolation, and integrating complex payment systems like Stripe Connect. My expertise extends to refactoring legacy and AI-generated code, ensuring systems are maintainable and compliant with data privacy standards. I excel in delivering pragmatic architecture solutions and optimizing codebases for performance and security, making me well-suited for roles that demand high-quality, production-ready software solutions.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

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Expert

Expert

Expert

Expert

Expert

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Expert

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Expert

Expert

Expert

Expert

Intermediate

Intermediate

Language

English

Fluent

Work Experience

Senior Software Engineer at Cognizant

August 1, 2021 - May 1, 2026

Led frontend architecture for a centralized web platform using React and TypeScript, establishing a component library, routing/state patterns (Redux/Zustand), and performance budgets that improved Lighthouse performance scores by ~25–35 points across core workflows. Built workflow-heavy UIs for creation, configuration, deployment, and monitoring using React, React Hook Form, and schema-based validation, reducing configuration errors by ~30% through client-side guardrails and clearer feedback loops. Implemented real-time status updates and notifications via WebSockets/SSE integrations, enabling near real-time agent/job state changes in dashboards and cutting manual refresh/support inquiries by ~20%. Developed reusable, embeddable chatbot modules (widget + theming + auth hooks) in TypeScript that could be integrated into multiple SaaS surfaces, accelerating new product integrations from weeks to days. Delivered analytics dashboards and data visualization components with charting librar

Senior Software Engineer at Accenture

February 1, 2017 - July 1, 2021

Delivered enterprise web applications using Angular and TypeScript, building modular UI patterns (smart/dumb components, shared services) and improving page load times by ~20% through lazy loading and bundle optimization. Implemented complex multi-step forms and guided wizards with robust validation using Angular Reactive Forms, reducing incomplete submissions and rework by ~25%. Built responsive dashboards for operational analytics and integrated backend APIs via REST/GraphQL, standardizing error handling, retries, and typed client models in TypeScript. Established CI/CD practices with GitLab/Jenkins, adding automated testing (Jest, Cypress/Playwright) and enforcing code quality checks to reduce production defects. Supported containerized deployments with Docker and Kubernetes, partnering with platform teams on rollout strategies and environment parity across dev/test/prod.

Software Engineer at IBM Consulting

July 1, 2014 - January 1, 2017

Built and maintained web application features using JavaScript, HTML5, and CSS3; collaborated with designers to deliver accessible, responsive interfaces. Developed backend services and integrations using Java and Node.js, exposing REST APIs and improving data flow reliability with consistent contracts and logging. Implemented search and analytics capabilities leveraging Elasticsearch, improving query responsiveness and enabling richer filtering for end users. Used Git and automated build tooling to standardize delivery workflows, improving release consistency across teams.