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Java Application Development Company

Java Development Company | Spring Boot, Enterprise Platforms, and Legacy Modernisation

Custom Java development across Spring Boot services, enterprise web platforms, J2EE estates brought up to date, Java APIs and Android clients on Java backends, all modernised for software expected to last a decade.

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SOC 2 CompliantISO 20000ISO 9001ISO 27001HIPAA CompliantGDPRClutch 5.0 RatingDesignRush 5 Star RatingCapterraGartnerVantaDrataOktaNinjaOneMicrosoft PartnerSophosCisco MerakiVMwareAWS PartnerGoogle WorkspaceDattoSentinelOnePalo AltoSOC 2 CompliantISO 20000ISO 9001ISO 27001HIPAA CompliantGDPRClutch 5.0 RatingDesignRush 5 Star RatingCapterraGartnerVantaDrataOktaNinjaOneMicrosoft PartnerSophosCisco MerakiVMwareAWS PartnerGoogle WorkspaceDattoSentinelOnePalo Alto

Why Businesses Choose Us for Java

We Inherit Code, Not Just Write It

Most of our custom Java development begins in a codebase someone else wrote, often on an unsupported JDK with a build nobody can reproduce. We reconstruct what it actually does from the code and the database, then change it without breaking the undocumented behaviour the business quietly depends on.

Boring Choices on Purpose

Spring Boot, PostgreSQL or Oracle, Kafka where it earns its place. Our Java development services favour libraries with long support horizons and large hiring pools, because a Java application usually outlives the team that wrote it and the fashionable framework it was tempting to use.

Performance Measured, Not Guessed

Our Java software development services cover JVM tuning, heap and garbage collection analysis, query profiling, and load testing against real traffic shapes. Java performance problems are almost never where people assume, which is why we profile before changing anything.

Handover Is Part of the Work

Our Java application development leaves readable code, current dependencies, tests that run, and documentation your own developers can follow. If you would struggle to hand the codebase to a new hire after we leave, we have not finished the job properly.

Services

Our Java Development Services

Custom Java Development

  • Custom Java application development built to your domain.
  • No product licence and no framework of ours to inherit.
  • Source, tests, and documentation yours from day one.

Java Web Development Services

  • Java web application development on Spring Boot.
  • Angular or React front ends, or server-rendered Thymeleaf.
  • Built for the load you have, not a hypothetical one.
Explore Java Web →

Enterprise Java Development

  • Enterprise Java application development for large estates.
  • Transaction integrity, audit trails, and role-based access.
  • Integration with the systems you cannot replace.
Explore Enterprise Java →

Spring & Spring Boot Engineering

  • Spring application development, from monolith to services.
  • Spring Security, Spring Data, and Hibernate done properly.
  • Upgrades from ageing Spring versions without a rewrite.

J2EE & Jakarta EE Modernisation

  • Custom J2EE development and migration off dead app servers.
  • Javax to Jakarta namespace moves handled methodically.
  • Incremental, so the system stays live throughout.
Explore Modernisation →

Java APIs & Integration

  • REST and GraphQL APIs, plus gRPC where latency matters.
  • Kafka, RabbitMQ, and Camel for asynchronous work.
  • Legacy SOAP endpoints wrapped rather than rewritten.
Explore Java APIs →

Java Mobile App Development

  • Android clients in Java or Kotlin on a Java backend.
  • One API serving Android, iOS, and web from the same logic.
  • Offline sync, push, and background work handled.
Explore Java Mobile →

Intranet & Extranet Portals

  • Employee intranets and partner or supplier extranets.
  • Single sign-on against Active Directory or Entra ID.
  • Per-partner data separation that survives an audit.
Explore Portals →

Java Cloud Development

  • Containerised Java on AWS, Azure, or Google Cloud.
  • Right-sized JVMs, because default heap settings waste money.
  • Quarkus or GraalVM native builds where cold starts matter.
Explore Java Cloud →

Performance & JVM Tuning

  • Heap, garbage collection, and thread pool analysis.
  • Query profiling and the N+1 problems nobody noticed.
  • Load tests shaped like your real traffic.

Java Consulting & Code Review

  • An honest read on a codebase before you commit budget.
  • Architecture review, upgrade paths, and risk register.
  • Useful when the original team has moved on.
Explore Consulting →

Maintenance & Support

  • Dependency and JDK upgrades kept current, not deferred.
  • CVE patching with a named engineer who knows your code.
  • Support tiers from business hours to always on.
Explore Support →
Java engineers reviewing an enterprise system architecture

Modernise the System, Do Not Replace It

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❝
Two firms quoted us for a full rebuild. AppStudio upgraded the JDK, replaced three dead libraries, and fixed the queries. Same system, four times faster, a fraction of the money.
Head of IT, Insurance Group

What to Expect From a Java Development Company

Business Priorities

First recommendation
Framework choice
Performance work
Legacy J2EE
Testing
Documentation
After go-live

Industry Gaps

Rewrite it in something modern
Whatever is current this year
Add servers
Out of scope
Manual before release
Delivered at the end, if at all
A new statement of work

Our Proven Advantage

Measure it, then change the least that works
Long support horizon and a real hiring pool
Profile the JVM and the queries first
Migrated incrementally while it stays live
JUnit and integration suites in the pipeline
Written as we go, for your next hire
Upgrades and CVE patching on a known scope

Global Standards. Built-In Trust.

Java projects tend to sit close to money, records, or regulated processes, so our work runs inside a certified security and quality management system with background-checked engineers and traceable change control. That includes dependency and container scanning in the pipeline, secrets kept out of configuration files, PIPEDA-compliant handling for Canadian clients, and the audit evidence SOC 2, HIPAA, and ISO reviews ask for.

ISO 27001
ISO 9001
ISO 20000
HIPAA Compliant
GDPR
AICPA SOC

Book a Free Java Consultation

Pick a time and tell us what you are running, what it needs to do, and what has already been tried. You will get a straight answer on whether it needs modernising, tuning, extending, or genuinely replacing, from the engineers who would do the work.

A Premier Java Development Company in Canada

Engineering leaders work with AppStudio because we are comfortable with software that already exists. Review boards including Clutch, DesignRush, and GoodFirms list us as a top rated Java web development company, and much of our Java work arrives by referral from clients whose systems we kept alive rather than replaced.

Clutch DesignRush GoodFirms
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Our Java Technology Stack

The JVM and build tooling, the Spring tier, the server and whatever renders the UI, persistence, the messaging edge, and the cloud and test tooling around it. Weighted toward the well supported, because most Java estates we inherit are expected to run for another decade.

Java
OpenJDK
Kotlin
Scala
Maven
Gradle
Spring
Spring Boot
Spring Security
Hibernate
Quarkus
Thymeleaf
Apache Tomcat
Angular
React
TypeScript
Vaadin
Bootstrap
Oracle
PostgreSQL
MySQL
MongoDB
Redis
Elasticsearch
Apache Kafka
RabbitMQ
Apache Camel
gRPC
GraphQL
REST APIs
AWS
Microsoft Azure
Docker
Kubernetes
Jenkins
JUnit 5

Our Java Development Process

Java has been declared obsolete roughly once every three years since 1998 and now runs a larger share of banking, insurance, logistics, and government systems than it ever has. The reason is unglamorous: the JVM is fast, the library ecosystem is deep, the language changes carefully, and you can still hire people who know it. As a Java development company, AppStudio works in Java because those properties matter more than novelty when software has to last.

Most of what our Java application development services are asked to do falls into three shapes. Build something new where reliability and integration matter more than speed to market. Extend a system that works but was not designed for what the business now needs. Or rescue an estate where the original team has gone, the dependencies are eight years old, and nobody is certain what would break.

The third is the most common and the most misdiagnosed. It usually arrives described as a rewrite, and a rewrite is usually the wrong answer. Replacing working software means rebuilding a decade of accumulated business rules that exist nowhere except in that code, which is why rewrites overrun so reliably. Choosing custom Java development over a full rewrite is usually the cheaper and safer path.

We read the code, run it, and profile the JVM and the database before proposing anything. The output is a written map of the system and an honest view of whether it needs tuning, extending, modernising, or genuinely replacing.
We agree the target: a supported JDK, the dependency upgrades that matter, the modules worth refactoring, and the integration boundaries that cannot move. Every decision ties back to a business outcome rather than a fashion.
Work happens in your repository in short increments, with tests added as we go, and the system stays live throughout. You can stop, ship, and see real numbers before funding the next phase.
JUnit and integration suites run in the pipeline, alongside dependency and container scanning, CVE patching, and the audit evidence SOC 2, HIPAA, and ISO reviews ask for. Security is designed in, not bolted on before go-live.
After go-live we keep the JDK and dependencies current, patch CVEs on a known scope, and stay available from business hours to always-on. The system keeps working long after we have left.

Proven by Results

The Numbers From the Java Estates We Run

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0%

average response time reduction from profiling before rearchitecting

0%

of clients who arrived asking for a rewrite did not need one

0%

of clients continued with us after the initial engagement

How We Deliver Value, in Our Clients’ Words

Malcolm Ferreira
Head of IT, Insurance Group, Toronto, ON

“We chose this Java development company for custom Java development services to modernise a policy platform our own team was afraid to touch. They profiled first and rearchitected only what needed it, and the Java development services carried through cutover with downtime measured in minutes.”

Anjali Krishnan
Director of Engineering, Logistics, Mississauga, ON

“As a Java application development company they understood integration, not just code. Our warehouse and carrier systems finally talk to each other now. Their custom Java development held up under real load.”

Stefan Brodeur
CTO, Fintech, Montreal, QC

“Their Java software development services moved us off an aging J2EE estate to Spring Boot without a big-bang rewrite. Compliance and performance both improved.”

Rhonda Achebe
VP Technology, Manufacturing, Hamilton, ON

“A Java software development company that actually reads the existing code before proposing a plan. That alone put them ahead of every other quote we received, and their Java development services delivered exactly that.”

Gordon Whitmore
IT Director, Government Agency, Ottawa, ON

“We needed the kind of ERP extranet development Ottawa public bodies require, with real security rigor for our portal. They delivered on schedule and cleared our audit on the first pass. That Java development company treated compliance as a first-class requirement.”

Corinne Lachance
Engineering Manager, Retail, Vancouver, BC

“Their Java web development services rebuilt our storefront backend for peak traffic. Checkout latency dropped and the site held through our busiest weekend of the year.”

Patrick O'Donnell
Head of Platform, Healthcare, Calgary, AB

“We engaged them for custom Java development services on a records system with a decade of edge cases. They preserved the behaviour that mattered and retired the rest.”

Farah Sultana
CIO, Education, Waterloo, ON

“Their Java application development services turned a fragile internal tool into a platform three departments now depend on. Reliable, documented, and straightforward to extend.”

Terrence Bouchard
VP Engineering, Financial Services, Toronto, ON

“The Java development services were senior from day one. No ramp-up and no hand-holding, just steady delivery against a plan we could actually follow.”

Linda Marchetti
Director of IT, Utilities, Edmonton, AB

“We were able to hire Java developers who plugged straight into our team and our repository. Six months on, they still feel like our own engineers, and their custom Java development services keep shipping.”

Devika Rao
Head of IT, Insurance, Ottawa, ON

“Their extranet development Ottawa work gave our brokers a portal with per-partner data separation that passed audit. One Java integration layer in front of our legacy systems, nothing else exposed.”

Java Platforms We Have Built and Rescued

Skills Compétences Canada digital platform

Empowering Future Talent in Trades and Technology

Commissioned by Skills Compétences Canada, we built a national bilingual platform with native apps, a secure CMS, and Canadian cloud infrastructure to promote trades and technology careers at scale.
Canadian Wildlife Health Cooperative surveillance platform

Digitizing Wildlife Surveillance for National Resilience

For the Canadian Wildlife Health Cooperative, we replaced siloed tools with a cloud-native platform that unifies field reports, lab diagnostics, and cross-province analytics in real time.
Seattle Aquarium interactive digital experience

Interactive Learning Through Digital Experience

We unified kiosks, ticketing, and mobile into one cloud-native platform for Seattle Aquarium, raising visitor engagement and streamlining operations across every touchpoint.

A Glance at Our Portfolio

See the design and engineering depth behind the apps and platforms we have delivered for clients.

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Mindset

Mindset is the Ultimate Source for Motivation, Self-development and Wisdom. With Mindset, you can play the world’s best motivational, inspirational and educational audios for free.

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View case Study 
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Jeddah Season

As part of the vision 2030, the Kingdom of Saudi Arabia has established a partnership with Zazz to modernize their nation wide mobile apps.

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View case Study 
Skills Competences
Canada Ontario

Built for the government of Ontario, to champion and stimulate the development of world-class technological and employability skills in Ontario youth.

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Roundup

Get cooking with The Roundup™, the definitive guide to buying, cooking & enjoying North American beef! This app has information on beef cuts, recipes, cooking & cuts videos to help you buy the proper cut and cook it confidently.

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ECAO

The app serves as a one-stop solution for Ontario’s electrical contractor community to organize and manage events, and conferences, talk to other members and share updates.

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Ideal Protein

The Ideal Protein App is the digital pocket companion to the Ideal Protein Protocol. This personalized Protocol assistant is designed to help people achieve their weight loss goals and support a new, healthy lifestyle through three prioprietary phases: Weight Loss, Stabilization, and Maintenance.

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View case Study 
WSPS

Designed & Developed to save lives, and help prevent the spread of COVID 19, by providing the most reliable and up to date information needed by Employers across Canada.

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View case Study 

Industries We Build Java Applications For

Java concentrates where transactions matter, integrations are numerous, and systems are expected to outlast the people who commissioned them.

Banking & Financial Services

Banking & Financial Services

  • Transaction integrity and reconciliation.
  • Core banking and payment integrations.
  • Audit trails that satisfy regulators.
Npo Industry

Insurance

Insurance

  • Policy administration and claims engines.
  • Rating and underwriting rules.
  • Broker and adjuster extranets.

Government & Public Sector

Government & Public Sector

  • Data residency inside Canada.
  • Accessibility and bilingual requirements.
  • Long support horizons expected.

Healthcare & Life Sciences

Healthcare & Life Sciences

  • HL7 and FHIR integration.
  • PHI handling and access control.
  • Clinical systems that cannot go down.

Logistics & Supply Chain

Logistics & Supply Chain

  • Warehouse and scanner integrations.
  • Route, load, and fleet systems.
  • EDI and carrier connections.

Manufacturing & Industrial

Manufacturing & Industrial

  • MES and ERP integration.
  • Shop floor data collection.
  • Supplier extranets and portals.

Retail & eCommerce

Retail & eCommerce

  • Order, inventory, and pricing engines.
  • Peak season load handling.
  • POS and loyalty integration.

Telecom & Connectivity

Telecom & Connectivity

  • Provisioning and billing systems.
  • High-throughput event processing.
  • Self-service customer portals.

Energy & Utilities

Energy & Utilities

  • Metering and consumption data.
  • Outage and asset management.
  • Regulatory reporting pipelines.

Education & eLearning

Education & eLearning

  • Student information systems.
  • Term-start capacity spikes.
  • Multi-campus intranets.

Enterprise SaaS

Enterprise SaaS

  • Multi-tenant Java architecture.
  • Per-tenant data isolation.
  • API-first product platforms.
Legal Services Industry

Legal & Professional Services

Legal & Professional Services

  • Matter and document management.
  • Time and billing integration.
  • Client-facing secure portals.

A Java Software Development Company Comfortable With Software That Already Exists

Plenty of firms will build you a new Java application. Far fewer will take on a codebase written by people who have left, running on a JDK that lost support years ago, with a build nobody can reproduce. That work is less photogenic and it is where most Java budgets actually go, so it is what we organised ourselves around.

Clients come to us under different labels, and the name, a Java development company, an agency, or a team, rarely predicts the work. What they share is a system that matters, a business that cannot pause while it is fixed, and a preference for hearing what the work will really cost. Whether you need one project delivered or a team working alongside your own, the starting point is the same conversation.

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AppStudio Java development team reviewing an enterprise codebase

Articles

Explore All Articles and Reports »
Modernizing legacy systems
May 5, 2026

Modernizing Legacy Systems Without a Full Rebuild
Application modernization strategy
April 29, 2026

Application Modernization Strategy: Patch It or Replace It?
Why transformations underdeliver
May 7, 2026

83% of Digital Transformations Underdeliver. Here Is the Autopsy

Java Development FAQs

We provide custom Java development, Java web application development, enterprise Java application development, Spring and Spring Boot engineering, J2EE and Jakarta EE modernisation, Java APIs and integration, intranet and extranet portals, Java cloud development, JVM performance tuning, and ongoing maintenance. Our Java application development services cover both new builds and existing systems, and the second is the larger share of our work. Java web application development services and custom Java application development company work often overlap on the same project, since extending a platform usually means building something new inside something old.
Cost scales with scope, so most projects fall between sixty thousand and four hundred thousand Canadian dollars depending on scope, integrations, and how much existing code is involved. Custom Java development services are quoted after a short discovery, because the honest answer depends almost entirely on what you are integrating with. Rates for senior Java engineers in Canada generally sit between a hundred and twenty and one hundred and ninety dollars an hour.
Timelines depend on scope: a focused Spring Boot service or internal application typically takes three to five months. An enterprise platform with multiple integrations runs six to twelve. Modernising an existing estate depends on its condition, though a first meaningful release usually lands within eight to ten weeks because we deliver incrementally rather than in one cutover.
Both descriptions fit, and the distinction people usually mean is mobile. As a Java development company we build server-side applications, web platforms, and enterprise systems. As a Java app development company we also build the mobile clients that sit on top, with Android in Java or Kotlin. Some clients search for a Java app development firm or a Java application development company and mean the same thing, so it is worth being specific about whether you need a mobile client, a web application, or both.
Enterprise here describes the constraints rather than the size of your organisation. A thirty-person insurance broker with policy data, an audit obligation, and four integrations has an enterprise Java problem. As an enterprise Java development company we take on that shape of work, and enterprise Java development services usually means transactions that cannot be lost, permissions that must be provable, and a system expected to run for years. A Java enterprise application development company is describing the same thing.
Yes, and it is a large part of our work. That means Spring Boot on the server with either a JavaScript front end in Angular or React, or server-rendered pages with Thymeleaf where a single-page application would be overkill. As a Java web application development company we take on both new platforms and the extension of existing ones, and Java web app development services are frequently how a client first engages us.
Yes, and it is one of the reasons clients come to us. J2EE became Java EE and then Jakarta EE, so a system described as J2EE is usually fifteen or more years old and running on an application server that has lost support. As a J2EE development company we handle those migrations incrementally, including the javax to jakarta namespace change, so the system stays live. Custom J2EE development on an existing estate is entirely feasible and often cheaper than the replacement being proposed, which is why a J2EE application development company is still a useful thing to be able to hire in 2026.
Yes. WebLogic, WebSphere, JBoss, and old Tomcat versions are all common starting points, and the destination is usually a supported Tomcat or an embedded server in Spring Boot. We move one module at a time behind a routing layer so both versions run in parallel during the transition. It takes longer than a single cutover and it does not require a weekend where the business holds its breath.
Modernise, in about four cases out of five. A working system encodes years of business rules that exist nowhere else, and a rewrite starts from the subset somebody remembers. Upgrading the JDK, replacing unmaintained libraries, adding tests, and refactoring the worst modules delivers most of the benefit at a fraction of the risk. We will tell you when a rewrite genuinely is the answer, which is usually when the architecture cannot support a requirement at all.
Spring and Spring Boot for most work, with Spring Security and Spring Data alongside. Hibernate for persistence, Quarkus where fast startup or a small memory footprint matters, and Thymeleaf or Vaadin for server-rendered interfaces. On existing systems we work with whatever is already there, including Struts and older Spring versions, because replacing a framework and adding a feature at the same time is how projects lose control.
Yes. As a Java cloud development company we containerise Java applications for AWS, Azure, or Google Cloud, which is mostly a matter of getting configuration, secrets, and JVM sizing right. Default heap settings inside a container waste a surprising amount of money. Where cold start time matters we look at Quarkus or a GraalVM native image rather than assuming a standard JVM.
Yes. REST for most cases, GraphQL where clients need flexible queries, and gRPC where service-to-service latency matters. We also wrap legacy SOAP endpoints so new clients get a modern interface without the old system being touched. Our API development in Java page goes into more detail if that is your primary need.
A supported long-term release, which currently means Java 21 or Java 17. If you are on Java 8 or 11 you are on a version whose free support has ended or is ending, which is the most common serious risk we find in Java estates. The upgrade is usually less painful than teams expect and brings real performance improvements along with security updates.
Yes, on tiers from business hours to always on. Support covers dependency and JDK upgrades, CVE patching, performance monitoring, and small enhancements, with a named engineer who knows your codebase. This is deliberately unglamorous work and it is what keeps a Java application worth owning five years after launch.
Yes, and we recommend it when the original team has moved on. A two to three week review gives you a written assessment of code quality, dependency risk, security exposure, upgrade paths, and a costed roadmap. It is a fixed fee and it is yours to act on with us or with another firm.
Yes. Dedicated Java developers work inside your team and follow your process, and you interview every candidate first. If your need is primarily staffing rather than delivery, our hire Java developers page covers rates, vetting, and how the engagement works. Plenty of clients hire Java app developers for a build and keep one or two on afterwards for maintenance.
Our Java developers average eight years and the leads considerably more, which matters because most of our work involves reading code before writing any. Experience in enterprise Java is different from general programming experience: knowing how a connection pool behaves under load, or why a transaction boundary is in the wrong place, comes from having been on call for systems like yours.
You do, completely, from the first commit. Work happens in your repositories where possible, there is no proprietary framework of ours embedded in the result, and the licence position of every third-party dependency is documented. Ask any Java development company you shortlist the same question, because arrangements that keep you dependent are easier to enter than to leave.
This is a normal starting condition rather than an obstacle. We reconstruct the picture by reading the code, running it, examining the database, and interviewing whoever remains. The output is a written map of the system, which most clients tell us becomes their onboarding document. It is also the only responsible basis for estimating anything else.
Book a free consultation and tell us what you are running, what it needs to do, and what has already been tried. If existing software is involved, read-only access to the repository is worth more than any specification. We will come back with a straight view on whether it needs tuning, extending, modernising, or genuinely replacing.

Let Us Look Before You Rebuild

Work with a Java development company that reads the code before recommending the rewrite. Book a free consultation for a straight assessment of what you have and what it needs.

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Java application developers planning an enterprise build

Request a Java Consultation

Tell us about the application you want built, the estate you need modernised, or the portal your partners have been asking for, and one of our Java leads will come back with a scope and a cost range.

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