Custom Spring Boot Services
Greenfield Spring Boot 3 microservices on JDK 21. REST APIs, GraphQL, scheduled jobs, with observability and graceful shutdown built in from sprint one.
250+ Java Services Shipped · 99.95% Average Client Uptime
Java Development Company for Custom Software and SaaS
Enterprise Java development since 2015. Spring Boot 3, JDK 21, Spring Cloud microservices, Kafka, Kubernetes, GraalVM native. Senior teams who ship reliable Java that survives production load.
4.9 / 5from 2,495 reviews
ISO 9001 Certified
250+
Java Services in Production
11+ yrs
Shipping Since 2015
99.95%
Average Client Uptime
Top 1%
Developer Vetting Bar
Your Trusted Java Partner
Java Development Built for Long-Lived Production Systems
Senior Development, Predictable Releases, Production That Holds
Work with senior Java developers who have shipped Spring Boot more than once. From microservices and event-driven systems to cloud-native modernisation, we build Java backends that scale with your business and stay reliable long after launch.
Java Clients
Which companies trust us with Java development?
Real Java services live today, across 35+ countries
How Much Do Java Development Services Cost?
Transparent USD Rate Bands, No Hidden Markup
Java development services typically range from $25,000 for a small Spring Boot microservice up to $200,000 and above for an enterprise platform with 10+ services, Kubernetes, multi-region replication, and Kafka. SaaS backend builds run $60,000 to $150,000. Dedicated senior Java developer rates start at $25 per hour or $2,800 per month. Decipher Zone replies to your brief within 1 business day and sends a fixed-price proposal in 5 business days.
Small Java service
$25K+
1 microservice, REST + DB
Java SaaS backend
$60K to $150K
Auth, Kafka, multi-tenant
Enterprise platform
$200K+
10+ services, K8s, multi-region
Dedicated developer
$2,800/mo+
Senior, monthly rolling
What We Build
What can we build with Java?
From greenfield Spring Boot services to GraalVM native compilation. Same senior team, same code review bar.
Enterprise Java Modernisation
Phased migration from Java 8 or 11 to JDK 21. Spring Boot 1.x or 2.x to 3.x. Monolith to microservices using the strangler-fig pattern with reproducible builds.
Cloud-Native on Kubernetes
Helm charts, Kustomize overlays, JVM-tuned container images sized for cgroups. Multi-region deployment on AWS EKS, Azure AKS, or GCP GKE.
Event-Driven Systems
Kafka and Spring Kafka for high-throughput pipelines. Exactly-once semantics, Avro or Protobuf schema registry, dead-letter handling, replay tools.
Reactive Java with WebFlux
Non-blocking services with Project Reactor and WebFlux. R2DBC for reactive Postgres. Higher throughput per JVM and predictable tail latency under load.
GraalVM Native Compilation
AOT compilation to native binaries with GraalVM. Sub 100ms startup for serverless and CLI tools, lower memory footprint, smaller container images.
Reference Architecture
Which architecture do we use for Java development?
Six layers we wire together on greenfield projects. Each layer is observable, replaceable, and tested in isolation.
Layer 01
Edge
Cloudflare, Istio Ingress
Global edge, WAF, rate limiting, mTLS at the perimeter
Layer 02
API Gateway
Spring Cloud Gateway
Routing, auth, request transformation, circuit breakers
Layer 03
Services
Spring Boot 3 microservices
Stateless services with health, metrics, and tracing built in
Layer 04
Messaging
Kafka, RabbitMQ
Async event flow, exactly-once semantics, schema registry
Layer 05
Data
PostgreSQL, MongoDB, Redis
Primary plus replicas, point-in-time recovery, snapshot backups
Layer 06
Observability
OpenTelemetry, Prometheus, Grafana
Logs, metrics, traces correlated by request ID end to end
Delivery Process
How does our Java development process work?
Predictable cadence, documented milestones, audit-friendly deliverables at every stage.
- 01Day 0 to 5
Architecture Review
Free architecture review of your current Java stack. Written proposal with milestones, team shape, and rate band in 5 business days.
- 02Day 6 to 10
SOW and Onboarding
Mutual NDA before any code. UK or USA SOW. Your repo provisioned. Senior developers onboarded to your sprint cadence.
- 03Sprint 0
Scaffold and CI/CD
Spring Boot 3 project scaffold with strict checks, Testcontainers, ArchUnit, observability, Helm charts, and CI on day one.
- 04Every Sprint
Two-Week Sprints
Two-week sprints with public board. Weekly demos in your time zone. Code review on every PR. Load tests on every build.
- 05Milestone
Production Release
Documented release. Runbook, observability, and load-test results attached. Production cutover during your maintenance window.
- 06Post-Launch
Run and Maintain
Optional support retainer. Same team. Same SLA. 95 percent of clients extend past 12 months. Handover documentation included.
7-day No-Risk Trial
The first week is on us
On dedicated Java developer engagements, the first week is on us. Walk away free if the fit is wrong.
Engagement Models
What engagement models do you offer for Java development?
Transparent USD rate bands, rolling monthly cancel, no setup fees, no markup.
Hourly
Pay only for hours used
$25/hour
Tracked weekly, billed monthly
- Code reviews and audits
- JVM tuning and profiling
- Short surge work
- No minimum commitment
- Mutual NDA before brief
Most Popular Dedicated
Senior Java developer, full-time on your team
$2,800/month
Monthly rolling, cancel anytime
- One developer, only you
- Embedded in your sprint
- Reports to your stakeholders
- 7-day no-risk trial
- 48-hour replacement guarantee
Staff Aug
Plug into your existing Java team
$2,500/month
Per-developer monthly
- Joins your standups
- Your sprint, your tools
- Your codebase, your repo
- Scale up or down monthly
- 48-hour replacement
Fixed Scope
Locked deliverables and timeline
$25,000+ project
Per-milestone payments
- Best for MVPs and services
- Locked scope upfront
- Locked timeline
- Demo-based acceptance
- No surprise change orders
Production Work
What have we built with Java?
Four recent engagements with backend metrics that procurement and development can both verify.
LIVEMyComplianceOffice
RegTech · Compliance backend
Spring Boot back-end for a compliance and risk platform serving regulated financial firms across UK, EU, and APAC. Multi-region on AWS with PostgreSQL and Kafka.
- TPS
- 1,200
- p99 latency
- 42 ms
- Uptime
- 99.95%
Visit MyComplianceOffice
LIVE101 Digital
FinTech · Banking-as-a-Service
Java microservices for banking-as-a-service infrastructure. KYC and KYB workflows, ledger, payments. Spring Cloud on AWS EKS, 24 services in production.
- Services
- 24
- Throughput
- 8K rps
- PCI
- Audited
Visit 101 Digital
LIVESymphony
SaaS · Secure communications
Java back-end for messaging, voice, video, signal, and analytics modules used by global financial institutions with strict compliance.
- Concurrent
- 100K+
- Test coverage
- 85%
- Release
- weekly
Visit Symphony
LIVEComviva
Telecom · Mobile money
Java back-end for mobile money platform across emerging markets. High-volume transaction processing, settlement, reconciliation, multi-market operations.
- Tx volume
- 5M+/d
- Settle time
- T+0
- Markets
- 20+
Visit Comviva
Frequently Asked
Java Questions Development Leaders Actually Ask
Rate bands, JDK versions, Spring Boot stack, performance, answered up front.
What does Java development cost?
Small Spring Boot services start at $25,000. SaaS backend builds with auth, multi-tenancy, and Kafka run $60,000 to $150,000. Enterprise platforms with 10+ services, Kubernetes, multi-region replication, and event-driven flows start at $200,000. Dedicated senior Java developer rates from $25 per hour or $2,800 per month.
Which Java and Spring Boot version do you use?
JDK 21 LTS and Spring Boot 3.4.x for almost everything new. Spring Boot 3 requires JDK 17 minimum. We also maintain JDK 8, 11, 17 codebases in production and run phased JDK upgrades with reproducible builds.
Do you handle microservices and Spring Cloud?
Yes. Spring Cloud (2024.x), service discovery, config server, circuit breakers with Resilience4j, distributed tracing with OpenTelemetry, Kafka or RabbitMQ for messaging, Helm or Kustomize for Kubernetes deployment.
Can you migrate legacy Java codebases?
Yes. Java 8 or 11 to JDK 21, Spring Boot 1.x or 2.x to 3.x, monolith to microservices using the strangler-fig pattern. We document the upgrade plan with rollback steps and ship incrementally behind feature flags.
What about JVM tuning, load testing, and observability?
JFR and Async Profiler for production profiling. JMH for microbenchmarks. Gatling or k6 for load tests. We size heap, pick the right GC (G1, ZGC, or Shenandoah), tune the container image for cgroups, and ship OpenTelemetry traces from sprint one.
How fast can you start?
A senior Java developer replies within 24 hours of your brief. Free architecture review and written proposal in 5 business days. SOW signed by day 10. First code in your repo within 2 weeks.
Why hire Decipher Zone for Java?
Ten years shipping Java in production. 250+ Java services live today. 95 percent client retention past 12 months. ISO 9001 certified. NDA signed on request. Source code in your repository from day one. 7-day no-risk trial on dedicated engagements.
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Free Architecture Review · Reply in 1 Business Day
Ready to Ship Java That Survives Past Launch?
Send a brief. A senior Java developer reads it personally and replies within one business day with a free architecture review and proposal. No sales call, no pitch deck.
- Reply within 1 business day
- Free architecture review
- Mutual NDA before brief