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We build Holded using the following technologies and technical decisions.

Our technological stacks are always evolving in a way that allow us to innovate and create sustainable, maintainable and scalable software.

Front-end

  • Programming language: TypeScript
  • Rendering library: React
  • State management: Redux
  • Utility-first CSS framework: Tailwind
  • Testing library: Jest
  • Module bundler: Webpack, Vite
  • Styling: SCSS, PostCSS, SCSS Modules, Emotion
  • Other libraries:
    • React Query: Fetching, caching and updating data
    • React Hook Form: Performant, flexible and extensible forms with easy-to-use validation

Architectural foundations

  • Maintainability and scalability is a must
  • Modular application design
  • Separation of concerns (domain, application, infrastructure and UI layers)
  • Dependencies only go in one direction UI -> application -> domain
  • We only use headless 3rd party components
  • We think twice before adding a 3rd party library, but always balancing the tradeoffs of building vs buying

Things we value the most

  • Maintainable, testable, and readable code.
  • Striving for an optimal solution, but keeping in mind maintainability over premature optimization
  • Testable code over using a concrete framework.

What is next in the roadmap?

  • Bi-directional data streaming for real time features with gRPC web
  • Next.js
  • Public websites with headless CMS (TBD)

Mobile

  • Programming language: TypeScript
  • Application framework: React Native
  • Other libraries:
    • React Query: Fetching, caching and updating data
    • React Hook Form: Performant, flexible and extensible forms with easy-to-use validation

Architectural foundations

  • Maintainability and scalability is a must
  • Modular application design

Things we value the most

  • Maintainable, testable, and readable code.
  • Striving for an optimal solution, but keeping in mind maintainability over premature optimization
  • Testable code over using a concrete framework.

What is next in the roadmap?

Server applications

Programming languages: PHP 7.4 for the main operational application and Golang for supporting services and tools.

Operational databases: MongoDB, Redis

Testing framework: PHPUnit

Components and libraries: Symfony components and other secure and well maintained open source components.

Architectural foundations

  • Maintainability and scalability is a must
  • Modular application design
  • Separation of concerns (domain, application, infrastructure and UI layers)
  • Command–query separation
  • Strategic and tactical Domain-Driven Design (DDD)
  • Testable code by design

Things we value the most

  • Maintainable, testable, and readable code.
  • Striving for an optimal solution, but keeping in mind maintainability over premature optimization
  • Testable and well architectured code over using a concrete framework

What is next in the roadmap?

  • Bi-directional data streaming for real time features with gRPC
  • PHP 8

Infrastructure and operations

  • Google Cloud Platform
  • Kubernetes
  • Infrastructure as Code (IaC) with Terraform
  • Internal tooling with Golang

Foundations

  • Maintainability and scalability is a must
  • Security is an integral part of our operations.
  • Technology with security at its core
  • Modular application deployment design
  • Private connectivity between components through VPC and peerings
  • Golang tooling microservice based
  • Any change in Infrastructure stack should be applied through IaC
  • Secret management through Vault
  • Monitoring data provisioning

Things we value the most

  • Security and protection of our customers' data
  • Maintainable and readable code
  • Striving for an optimal solution, but keeping in mind maintainability over premature optimization
  • Application security
  • Infrastructure security
  • Being cost-efficient

What is next in the roadmap?

  • Multiple node-pools with delegated responsibility
  • Bring E2E tests automations to the next level
  • Provisioning custom metrics for HPA

Analytics

Programming languages: SQL, Python and JavaScript

Tools:

  • dbt
  • Fivetran
  • Google Tag Manager Server Side
  • Google Data Studio

Google Cloud Platform:

  • BigQuery
  • BigQueryML
  • Pub/Sub
  • Dataflow
  • Cloud Functions
  • Cloud Run
  • Kubernetes Engine

Foundations

  • We conduct ourselves as a product team that generates data solutions
  • Our purpose is to implement a data-driven culture and replace gut-feeling decisions
  • Our goal is to empower and potentiate all the teams within the organization through data solutions
  • We strive to democratize the use of data.
  • We are involved in the whole life cycle of a feature, from defining KPIs and goals with business to event data validation with QA

Things we value the most

  • Scalability, availability, and fault tolerance
  • We care about the quality and consistency of the collected data

What is next in the roadmap?

  • ML-powered Qualification event and Lead Rating system
  • Event anomaly detection
  • Growth Loops analytics
  • Experimentation framework for in-product A/B testing
  • Churn Prediction
  • In-product recommender
  • Auto migration tools
  • Product-embedded analytics

QA

We use the Cypress end-to-end testing framework.

Foundations

  • We help development teams to embrace quality culture.
  • We participate in the whole development cycle rather than just validating in the last step.
  • We care about the end user and think on them to deliver the best quality product.
  • We are always looking forward to improving our methodologies and technologies.

Motivations

  • We follow a quality assistance model rather than a quality assurance one.
  • We see quality is a shared responsibility of the whole team, and we as quality experts help on following best practices and making good decisions.

What is next in the roadmap?

  • Complete automated test suite for web applications
  • Automated test suite for mobile applications
  • Data-driven quality assurance
  • Improve observability, monitoring and alerting