RKX Design
ENTR
Let's Talk
MenuClose

Software Engineering Services

From complex ideas
to working software.

Founder-led. Directly involved.

We build custom web applications, SaaS products and backend systems, modernize existing platforms, and integrate AI for defined tasks. We work directly together to agree the technical decisions and implementation scope.

Discuss Your ProjectExplore Services

What We Build

Engineering for the work
your business needs done.

Different products require different approaches. The goal is to choose the right architecture, build what matters, and leave room for change.

  1. Web Application Development

    Learn more about Web Application Development

    Custom dashboards, portals, and internal tools bring operational workflows together when spreadsheets or ready-made applications no longer fit.

    Work in context

    • Drug Management

      Founder professional contributions to application, frontend, and backend development.

    • Mailing Tool

      Founder professional contributions to a Next.js application developed for ODR.

    Discuss a web application
    • Business applications, dashboards, and internal tools
    • Interactive interfaces built around real user tasks
    • Workflow logic, permissions, and connections to existing systems

    React, Next.js, Astro, and TypeScript are options; the interface and product requirements guide the choice.

  2. SaaS Development

    Learn more about SaaS Development

    SaaS is software customers access through their own accounts, with subscriptions where the business model calls for them. We develop the product architecture and its core features.

    Work in context

    • TrendScore

      Independently developed SaaS product; evidence of product engineering, rather than every billing or tenancy capability.

    Discuss a SaaS product
    • Product architecture and maintainable application foundations
    • Authentication, user accounts, and access controls
    • Subscription workflows and third-party integrations

    The first release should cover the essential requirements while leaving a clear path for further development.

  3. AI Integration & Automation

    Learn more about AI Integration & Automation

    A model is useful when it solves a defined task. We integrate AI features into new or existing software, with clear access rules and review points.

    Work in context

    • Software Engineering

      Broader founder engineering experience; these examples are not delivered runtime-AI integration cases.

    Discuss an AI integration
    • Assistants and document-processing workflows
    • Knowledge search grounded in authorized sources
    • Bounded automation with validation and human review

    We agree on data access, usage limits and failure handling before connecting a model to the workflow.

  4. API & Backend Development

    Learn more about API & Backend Development

    We build the server-side rules, data boundaries, and permissions behind an application, along with interfaces that connect it to other systems.

    Work in context

    • Drug Management

      Founder professional frontend, backend, and API contributions.

    • HelloBetter

      Founder professional contributions to APIs, integrations, and modernization.

    Discuss an API or backend
    • Backend architecture, business logic, and data models
    • REST or GraphQL APIs where they suit the requirements
    • Third-party integrations and maintainable server-side systems

    Node.js, TypeScript, and PHP are potential tools, selected with the product requirements and existing environment in mind.

  5. WordPress Development

    Learn more about WordPress Development

    Custom publishing systems connect content architecture, themes, and Gutenberg editing. A separate headless frontend is an option when the delivery needs justify it.

    Work in context

    • WordPress Portfolio

      Historical custom themes and published project scope, with each engagement attributed on Work.

    • Impact Cleans

      Founder professional participation in headless WordPress engineering.

    Discuss a WordPress website
    • Custom websites, themes, and structured content models
    • Editorial workflows and headless WordPress where appropriate
    • Performance, accessibility, and technical SEO within development

    Content architecture and implementation decisions are shaped by how your site will be edited, used, and maintained.

  6. WordPress Plugin Development

    Learn more about WordPress Plugin Development

    Reusable functionality, integrations, and plugin products need a home independent of the theme. We build focused WordPress plugins around that responsibility.

    Work in context

    • WPBits Block Studio

      Collaboratively developed under the WPBits brand, with the founder’s contribution described on Work.

    Discuss a WordPress plugin
    • Custom plugins, Gutenberg blocks, and extension development
    • Integrations with external products and WordPress systems
    • Licensing systems, including Freemius integrations

    Our founder’s experience includes WordPress plugin product development, ongoing maintenance, and adapting extensions as requirements change.

  7. E-commerce Development

    Learn more about E-commerce Development

    Commerce development connects the storefront to the work behind an order: product data, checkout, payments, and the systems that keep operations moving.

    Work in context

    • HelloBetter

      Founder professional contributions to WooCommerce/Stripe payment migration and integrations; a scoped contribution to the platform.

    Discuss an e-commerce project
    • Online storefronts and product catalogues
    • Checkout experiences and payment integrations
    • WooCommerce implementations and custom commerce workflows

    WooCommerce is one possible foundation. The catalogue, operating requirements, and existing stack determine the right approach.

Existing Products Matter Too

Good software
doesn't stop at launch.

An existing product brings its own history, users, and constraints. We can help work through what needs to change, with attention to the system you already depend on.

  • Modernize a legacy application

    Update an ageing foundation while accounting for the workflows and dependencies already in use.

  • Improve performance and maintainability

    Identify bottlenecks and simplify code that has become difficult to understand or change.

  • Extend existing functionality

    Add new capabilities within the product’s current architecture, or revise that architecture where needed.

  • Connect external services

    Integrate the tools, data sources, and systems your product needs to work with.

  • Address technical debt

    Work through accumulated shortcuts and fragile areas with a practical order of priorities.

  • Continue product development

    Develop and maintain the application as user needs and technical requirements evolve.

Collaboration

Different projects.
A direct way of working.

You work directly with our founder, Kerem Yılmaz Güney, from technical decisions to implementation. These are possible ways to collaborate; the arrangement follows the project.

Technology

The tools follow
the problem.

Requirements, constraints, and your existing stack guide the technology choices. We choose tools for how well they fit the work and how the product will be maintained.

Frontend
React · Next.js · Astro · TypeScript
Backend
Node.js · PHP · APIs · Integrations
Content & Commerce
WordPress · Gutenberg · WooCommerce · Headless content systems
Architecture & Delivery
Application architecture · Performance · Technical SEO · Maintainability · Deployment workflows

Have a Project in Mind?

Let's work through
the technical details.

Tell us what you're building, what needs improving, or where your current system is getting in the way.

Discuss Your Project