Web application development
Full-stack web applications, from greenfield products to rebuilds of existing systems. We build frontend, backend, and everything in between, and we deliver code your team can keep working with after handover.
Services
What we deliver.
KYC Code Systems builds secure web applications and maintains them after launch. Our work spans greenfield products, integrations with external services, and technical review of existing systems. The services below describe what we actually do day to day.
Backend & API engineering
Server-side engineering: REST and GraphQL APIs, database schemas, background jobs, message queues, and scalable architectures. We work with Node.js, Python, Ruby, and Go, and with PostgreSQL, MySQL, and Redis.
Secure engineering
Security engineered in from the start, not bolted on later. Authentication, encryption at rest and in transit, least-privilege access, audit logs, and secure PII handling are standard practice in everything we ship.
Third-party integrations
We connect web applications to external APIs, payment systems, and identity verification providers such as Sumsub and Onfido. KYC, AML, and compliance flows are a specialty: we wire provider SDKs, webhooks, and admin tooling into real user lifecycles.
Code audit & technical review
We review existing codebases for security gaps, maintainability issues, and architectural risks. You get a written report with concrete findings, prioritised by impact, and a proposed action plan. A common kickoff for teams inheriting legacy code.
Maintenance & ongoing support
We keep existing codebases running: dependency upgrades, security patches, bug fixes, and incremental feature work. Hourly or retainer-based, with weekly status updates and clear ownership of what we touch.
How we engage
Fixed-price projects
For well-defined scope. We provide a written estimate after a discovery call and a review of your requirements.
Hourly / time-and-materials
For ongoing work or projects where scope will evolve. Weekly time reports and invoices.
Full-time allocation
For teams that need an engineer embedded in their stack for weeks or months. Monthly retainer, daily coordination with your team.
Tell us about your project.
We respond to every enquiry within two business days.