Zentury
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TechnologiesJava

Development company

Java

Back-end systems built to run for years: secure, typed and ready for heavy traffic.

Java is what banks, insurers and large platforms trust with their core systems. We build Spring Boot services, enterprise applications and APIs, and we modernise the Java systems that have been running a business for a decade.

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Engineer working at a computer in a dim office
Spring BootHibernateKotlin
OrderController.java
@RestController@RequestMapping("/orders")class OrderController {    private final OrderService orders;    OrderController(OrderService orders) {        this.orders = orders;    }    @PostMapping    Order create(@Valid @RequestBody NewOrder body) {        return orders.place(body);    }}

01 — Services

What we build with Java

Systems where uptime, security and years of maintainability matter more than anything else.

  1. Enterprise applications

    Core business systems for finance, healthcare and logistics, with the audit trails and access rules those sectors need.

  2. Spring Boot APIs

    Well-structured REST APIs and microservices on Spring Boot, tested and documented from the start.

  3. Cloud platforms

    Java services built to run in containers on AWS, Azure or Google Cloud, and to scale when traffic grows.

  4. SaaS products

    Multi-tenant platforms with billing, roles and reporting, designed so new customers don’t slow anyone down.

  5. Mobile & web back ends

    The server behind your Android, iOS and web apps, plus native Android features in Java or Kotlin.

  6. Application modernisation

    Moving old Java EE or Java 8 systems to current Java and Spring, piece by piece, while they stay in use.

  7. Integrations & migrations

    Connecting Java systems to payment providers, ERPs, message queues and partner APIs, or moving data between them.

  8. Dedicated Java developers

    Senior Java engineers who join your team for as long as you need them, working in your tools and process.

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02 — Why Java

Java vs. dynamically typed languages

Why large, long-lived systems are so often written in Java.

JavaDynamic languages

  • Mistakes caught before release

    The compiler rejects whole classes of bugs

  • Speed under sustained load

    The JVM optimises hot code while it runs

  • Safe changes to a large codebase

    Types and IDE tooling make big refactors safe

  • Time to a first prototype

    More setup up front; it pays back as the system grows

03 — The technology

Key things to know about Java

Java is a typed, compiled language that runs on the Java Virtual Machine (JVM). Code built once runs on Linux, Windows and macOS servers without changes.

It has decades of libraries behind it, and Spring Boot makes new services quick to set up. Long-term support versions get security updates for years, which is why regulated industries rely on it.

Java suits systems that must stay reliable for a long time: payments, banking, insurance, logistics and large SaaS platforms. For a small marketing site or a quick prototype, we’ll suggest something lighter.

Apps built with Java

  • Netflix
  • Amazon
  • Spotify
  • LinkedIn
  • Uber
  • Airbnb
  • Netflix
  • Amazon
  • Spotify
  • LinkedIn
  • Uber
  • Airbnb
  • Netflix
  • Amazon
  • Spotify
  • LinkedIn
  • Uber
  • Airbnb

04 — Process

How a Java project runs

Four stages, with the architecture agreed before the first line of code.

  1. 01

    Discovery

    We map the systems involved, the data, the users and any compliance rules, and agree what success looks like.

  2. 02

    Architecture

    Services, data model, security and infrastructure are designed and reviewed with your team.

  3. 03

    Build in sprints

    Two-week sprints with automated tests, code review on every change and regular demos.

  4. 04

    Release and operate

    Staged rollouts, monitoring and alerts, then ongoing support and version upgrades.

05 — Tech stack

Our Java tech stack

The frameworks and tools we reach for on most Java projects.

  • 01CoreJava · Spring Boot · Hibernate · Kotlin
  • 02MessagingApache Kafka · Redis
  • 03DatabasePostgreSQL · MySQL · MongoDB
  • 04Build & testGradle · Maven · JUnit 5
  • 05DevOpsDocker · Kubernetes · AWS

Core

  • Java
  • Spring Boot
  • Hibernate
  • Kotlin

Messaging

  • Apache Kafka
  • Redis

Database

  • PostgreSQL
  • MySQL
  • MongoDB

Build & test

  • Gradle
  • Maven
  • JUnit 5

DevOps

  • Docker
  • Kubernetes
  • AWS

06 — Industries

We’ve built software for your industry

Generic software rarely fits complex industries. We take time to understand the regulatory environment, user behavior, and operational realities of your space before writing a single line of code.

  • Agriculture
  • Fintech
  • Healthcare
  • Education
  • eCommerce
  • Hospitality
  • Entertainment
  • Government
  • Real Estate
  • Business
  • Logistics
  • Tech & IT
  • Non-Profit
  • Automotive
  • Travel & Tourism

07 — Client voice

Working with Zentury has been a game-changer for our business. Their AI solutions have revolutionized our operations, enabling us to automate repetitive tasks and make data-driven decisions with ease. We couldn’t be happier with the results.

John AndersonCEO of Oklahoma Medical Care

Partnering with Zentury has transformed our business. Their AI solutions have streamlined our operations by automating routine tasks and empowering us to make smarter, data-driven decisions. The results have exceeded our expectations.

Brandon PearsonBig Canyon Inc.

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FAQ

Java questions

01Is Java still worth using for new projects?

Yes, especially for systems that need to be secure and reliable for many years. Modern Java is far less verbose than it used to be, and Spring Boot makes new services quick to start.

02Can you modernise our old Java system?

Yes. We add tests around the current behaviour, then upgrade the Java version and frameworks in stages, so the system keeps running and nothing changes for your users.

03Java or Kotlin?

Both run on the JVM and work together in one project. We use Java for most back-end work and Kotlin where your team prefers it or for Android. We’ll follow what fits your team.

04Do you work with regulated industries?

Yes. We build with audit logs, role-based access and encryption in mind, and work with your compliance team on requirements like HIPAA or PCI DSS.

05How long does a Java project take?

A focused service or API takes 8–12 weeks. Larger enterprise systems are planned in phases over several months, with something usable delivered in each phase.

09 — Get in touch

Let’s build

Let’s Build Something That Works

Have an idea you’re ready to move on? A problem your current technology isn’t solving? Our team is based in Austin, Texas, and works with businesses all over the world. Reach out — the first conversation is free, and you’ll leave with clarity, not a sales pitch.

Email us
Studio
5900 Balcones Drive STE 100, Austin, Texas 78731

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