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Java development company · UK
Java Development Company in the UK
Work with a UK-focused Java development company for stable APIs, reliable data flows, and production services your product can grow on. Techsleight Labs plans, designs, builds, QA-tests, launches, and supports production software with senior engineers, weekly demos, and clear delivery ownership.
- Strategy, build, QA and launch in one team
- Fixed-price projects after discovery
- Code and IP owned by you
Capabilities
Java capabilities we bring to your product.
Engineers fluent in modern Java and Spring — and patient with the Java 8 services, XML configuration and application servers many UK businesses still depend on.
Java 8 and 11 upgrades
Moving to Java 21 or 25 touches more than syntax: libraries that dropped old JDKs, removed modules such as JAXB, and the javax-to-jakarta rename in Spring Boot 3. We stage it and keep releasing.
Messaging and event streaming
Kafka and RabbitMQ producers and consumers with retries, dead-letter topics and idempotent handlers, so a replayed message does not charge a customer twice.
Enterprise integration
SOAP and REST APIs, SFTP file drops, fixed-width batch files and Spring Batch jobs, connected to your ERP, CRM or payment provider with errors someone can act on.
JVM performance
Heap and garbage-collector tuning, thread dumps, Java Flight Recorder profiles and connection-pool sizing — finding why a service slows at month-end before buying bigger servers.
Tests that run in CI
JUnit, Mockito and Testcontainers against real PostgreSQL and Kafka, plus contract tests between services so one team’s change does not break another’s.
What we build
What we build with Java.
The Java work UK organisations most often bring us — usually on systems that cannot stop while we change them.
Payment and ledger services
Services that move or record money, with idempotency keys, full audit trails and reconciliation reports your finance team can check line by line.
Monolith to services, gradually
Carve services out of a large Java application one domain at a time behind a stable API, instead of betting the business on a rewrite.
Integration hubs
Orders, stock and invoices flowing between your ERP, warehouse, CRM and finance systems, with retries and alerts instead of manual re-keying.
Rules and quote engines
Pricing, eligibility and underwriting rules as tested, versioned Java code, so changing a rule is reviewed and released like any other change.
APIs for web and mobile apps
Spring Boot back ends for React, Angular or mobile front ends: authentication, roles, file uploads, notifications and the admin tools support staff need.
Legacy application rescue
Get an old WebLogic, JBoss or Tomcat application building, tested and deployable in containers again, then decide what to modernise first.
Technology stack
Technology stack.
The tools that usually sit around Java in the projects we join. We fit into your stack — this is where we are most at home.
Core
Java 17, 21 and 25Spring BootSpring SecurityJakarta EE
Data
Hibernate and JPAPostgreSQL and MySQLFlyway and LiquibaseRedis
Messaging and integration
Apache KafkaRabbitMQSpring BatchSpring Integration
Testing
JUnitMockitoTestcontainersContract tests
Runtime and observability
Java Flight RecorderMicrometerOpenTelemetryG1 and ZGC tuning
Build and delivery
Maven and GradleDockerKubernetesGitHub Actions
Pricing
Java development pricing.
Start with discovery, move to a fixed-price build, or run a dedicated team for a longer roadmap.
Java discovery sprint
From £2,000
Architecture, roadmap, cost planning, and project-risk validation
- A short strategy sprint covering technical scope, user flows, delivery plan, and budget range.
Managed Java development project
Fixed quote
MVPs, rebuilds, SaaS platforms, dashboards, portals, and business-critical launches
- Product planning, UX, engineering, QA, deployment, and post-launch support under one delivery owner.
Dedicated Java development team
From £9,500 per month
Longer roadmaps, multi-sprint delivery, and product teams that need extra senior capacity
- A stable engineering pod with weekly demos, sprint planning, code review, and transparent reporting.
Prices are in GBP. Every estimate is confirmed in writing after a discovery call — the figures above are where engagements start, not a quote.
How we deliver
How we deliver your Java project.
Seven stages, the same on every project. The length of each one changes with the work; skipping one never saves time for long.
- 01
Product and technical discovery
We map your Java product goals, users, integrations, compliance needs, timeline, and commercial priorities before planning the build.
Goals, users and constraints agreed
- 02
Architecture and delivery plan
You get a practical Java roadmap with milestones, team shape, risks, estimates, and the first release path.
Roadmap, team and estimate
- 03
Design, build, and QA
Our team ships the Java product in controlled sprints with code review, testing, demos, and visible progress every week.
Tested software every sprint
- 04
Launch and improvement
We handle deployment, analytics, monitoring, handover, and post-launch iterations so your Java platform keeps improving.
Live, monitored and documented
Why Techsleight
What working with us is actually like.
No inflated numbers — just how we run projects, and what you can hold us to.
Product engineering, not ticket-taking
We ask what the software is for before we estimate it — and we will tell you when something should not be built, or should be bought instead.
AI where it earns its place
LLM features, retrieval and automation built with evaluation, guardrails and cost controls, and plain software where that is the better answer.
Full-stack under one roof
Design, frontend, backend, mobile, cloud and QA in one team, so nothing falls between suppliers.
UK-focused delivery
UK business hours, estimates in pounds, and a contract with a UK company. Our engineers are based in the UK and India.
Flexible engagement
A fixed-scope project, dedicated developers or a monthly retainer — and you can move between them as the work changes.
You own everything
Code, IP, cloud accounts and documentation are yours from day one. We sign an NDA before discovery if you need one.
Support after launch
We stay on for fixes, upgrades and new features, or hand over cleanly to your in-house team with the documentation to match.
Relevant work
Related product work.
We do not have a published Java case study yet — these show the kind of product work our engineers join.
All case studiesEducation · SaaS
University Management
University management system replacing spreadsheet enrolment and timetabling.
ReactNode.jsPostgreSQLAWS
Read the case studyTravel · Platform
Travel Ecosystem
Travel platform bringing flights, hotels, itineraries and loyalty together.
Next.jsNode.jsPostgreSQLStripe
Read the case studyLegal · SaaS
CO-LAW Group
Client intake, risk checks and document workflows for a boutique law firm.
Next.jsPostgreSQLAWSStripe
Read the case studyFAQs
Questions we get asked.
Straight answers on scope, cost, timelines and how we work. If yours is not here, ask us directly.
What does a Java development company do?
A Java development company plans, designs, builds, tests, deploys, and supports Java software. At Techsleight Labs, that can include discovery, architecture, UI/UX, API integration, QA, cloud deployment, analytics, and post-launch roadmap support.
Do you work with companies in the United Kingdom?
Yes. This Java development company page is focused on United Kingdom businesses. We support UK collaboration with clear written updates, weekly demos, and planned handoff points so distributed teams can move quickly.
How much does Java development cost?
Java development pricing depends on scope, integrations, user roles, design depth, compliance needs, and launch timeline. Discovery sprints start from £2,000, dedicated teams start from £9,500/month, and managed projects are quoted after scope validation.
Can you build a complete Java product, not just provide developers?
Yes. You can use Techsleight Labs as a full Java development company for strategy, design, engineering, QA, deployment, and support. You can also start with a small discovery sprint before committing to the full build.
Can you improve an existing Java application?
Yes. We often join existing Java products to fix performance, improve architecture, add features, stabilise releases, modernise UI, or prepare the system for scale. We begin with a focused audit so the first sprint is practical.
Who owns the code and product IP?
You own the code, documentation, product IP, design assets, and infrastructure setup created for your project. We can sign an NDA before discovery and work inside your repositories, cloud accounts, and project tools.
How fast can a Java development project start?
Discovery can usually begin within a few working days of the first call, and most projects start within 5–7 working days of sign-off. Larger builds usually need a short planning sprint to confirm scope, architecture, milestones, risks, and the right team before full development begins.
Do you provide post-launch Java support?
Yes. After launch, we can continue with monitoring, bug fixes, performance improvements, security updates, roadmap features, analytics, and handover support. Many clients keep a monthly retainer after the main release.
Start a project
Planning a Java project?
Tell us what you are building with Java. We will reply within one working day with questions, a first view on approach and the next step.
What happens next
- 1A senior engineer reads your brief within one working day, and replies with questions or a first view.
- 2A 30-minute call to understand the goal, constraints and what good looks like — no sales script.
- 3A written proposal with scope, milestones, team and a GBP estimate you can take to your board.
Techsleight Labs is a trading name of Krapton IT Consultancy.
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