Techrays Labs

Technology / Java

Java development company

Enterprise-grade Java and Spring services, including banking back ends, delivered at a fixed price by senior engineers working AI-first.

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(01) What we build

What we build with Java.

  • Enterprise services

    Spring Boot services with clear boundaries, transactions you can reason about and monitoring built in.

  • Banking and lending back ends

    Ledgers, loan and savings products and multi-currency accounts, including extensions to Apache Fineract.

  • Integration layers

    Connect core systems, payment gateways and partner APIs using queues and well-defined contracts.

  • High-volume batch and event processing

    Scheduled jobs and event consumers for reconciliation, reporting and statements, with safe retries.

  • API platforms

    Secure REST APIs with authentication, versioning and documentation for web, mobile and partner use.

  • Legacy Java upgrades

    Move older Java versions and monoliths forward in stages, keeping the system live during the work.

(02) Why Techrays

Fixed price, AI-augmented, yours.

  • Fixed price for long-lived systems

    Java platforms are expected to last for years, so we scope carefully: modules, integrations and non-functional needs are written into one proposal with a price and date. Later changes are quoted before work begins.

  • AI under senior supervision

    AI produces draft boilerplate, tests and documentation for Spring services, while senior engineers own domain modelling, transaction boundaries and security reviews. The speed gain does not come from skipping review.

  • Open source ecosystem, no lock-in

    Java, Spring and PostgreSQL are open source, and we favour portable infrastructure. You own the code, build files and deployment scripts from day one, so the system stays maintainable after delivery.

(03) Ecosystem

The Java ecosystem we use.

  • Java
  • Spring Boot
  • Spring Security
  • Hibernate
  • Maven
  • Gradle
  • PostgreSQL
  • Kafka
  • Apache Fineract
  • JUnit
  • Docker
  • Keycloak

(04) Process

From scope to launch.

  1. DAYS 1–3

    01

    Scope and domain model

    We map your domain, integrations and non-functional needs, then agree a service boundary plan and a fixed quote.

  2. WEEK 1

    02

    Architecture

    Spring Boot service layout, data access and API contracts reviewed before build, with security rules written down.

  3. WEEKS 2–5

    03

    Build and test

    JUnit and integration tests with Testcontainers, static analysis in CI and senior review of each change.

  4. WEEK 6+

    04

    Release

    Containerised deployment, observability and performance checks against the targets agreed at the start.

(05) Related

Keep exploring.

Want proof first? See the products we have shipped.

(06) FAQ

Questions, answered.

Why choose Java for a banking or fintech back end?

Java has a mature ecosystem, strong typing and long-term support releases, and open source banking cores such as Apache Fineract run on it. That lowers risk for systems that must stay correct for years.

Do you work with Spring Boot?

Yes. Spring Boot is our default for new Java services, with Spring Security for access control and Spring Data for persistence.

Do you use Spring Boot?

Yes. Spring Boot is our default for Java services because of its mature security, data and testing support. We keep services modular, with clear boundaries, so a large system remains readable as the team grows.

Can you modernise a legacy Java application?

Yes. We start by documenting behaviour and adding tests around it, then move in stages: upgrade the Java version, replace outdated libraries and extract modules. The system stays in production throughout.

Is Java a good fit for banking or fintech back ends?

It is a common choice because of its strong typing, mature libraries and predictable performance. For core banking we often build on open source cores and add custom services around them, with audit trails throughout.

How do you test Java services?

Unit tests cover business rules, integration tests cover databases and external services using containers, and a small set of end-to-end checks covers key flows. All of it runs in the build pipeline.

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