Factual contract development, custom software solutions, and remote tech consulting. Helping businesses design, build, and optimize applications with high reliability.
Santosh Gautam offers freelance software development and systems architecture services for international clients, businesses, and agency partners. Specializing in JavaScript (React, Vue.js, Node.js) and PHP (Slim Framework, WooCommerce) ecosystems, he manages the entire lifecycle—from database architecture to API integration and VPS deployment.
Collaborating on a contract basis requires a clear methodology to ensure project alignment and delivery predictability. Every engagement follows a four-step lifecycle:
Adding Stripe subscription options, writing custom payment gateway extensions, automating notification pipelines via WhatsApp APIs, and connecting secure webhook receivers.
Optimizing Google Core Web Vitals, configuring Static Site Generation (SSG) for SEO crawlability, and migrating slow systems to cached cloud servers.
A primary freelance service is integrating secure payment gateways and migrating database structures without application downtime. For e-commerce systems, custom plugins connecting dashboards with payment processors (such as Stripe or PayU India) are developed. This requires configuring secure redirect tokens, payload validation, and webhook listeners to prevent transaction double-billing.
Engineered and maintained a custom payment gateway plugin connecting e-commerce platforms with payment processors (such as PayU India). The backend manages transactions securely, verifying webhook validation states and logging transaction status dynamically.
View Payment Plugin BoilerplateProjects are accepted on either a fixed-scope basis or monthly retainer/contract format. In all engagements, clear milestones, deliverables, and communication protocols are established to ensure full delivery transparency.
Yes. I collaborate regularly with designers, product managers, and other developers using tools like Slack, Git/GitHub, Jira, and Figma to implement clean frontends and robust backends synchronously.
Repository access is managed strictly through secure, limited-permission team accounts on GitHub or GitLab. Server configuration and adjustments are executed via SSH key validation, and database credentials are kept isolated using secure environment variables.
The new cloud server environment is first built, configured with database schemas, and tested on a staging subdomain. Database writes on the old server are paused momentarily, DNS A-records are updated with a low TTL, and traffic is cut over to ensure zero lost transactions.
