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 34 Java engineers available · Replace any time

Hire senior
Java developers
in 14 days.

Senior Java developers experienced with Spring Boot, Spring Cloud, JPA / Hibernate, Kafka, JUnit, Maven/Gradle, and JVM tuning. 120+ Java specialists in-house shipping enterprise microservices, banking systems, payment rails, and Kubernetes-scale backends. Top 2% of applicants, replaceable any time.

14-day onboarding From discovery to first PR
Replace any time 5-day swap window
100% source code IP Full ownership in MSA
Your timezone 4-6 hr overlap
Java / Spring Boot / JVM Engineers
Senior bench · 7+ yr average
Java 8 / 11 / 17 / 21 Records & sealed classes Virtual threads (Loom) Streams & lambdas CompletableFuture
Custom Rate Available now
Arun J.
Senior Spring Boot Engineer · 10y
Spring Boot 3 JPA Kafka
Custom Rate Now
Meera S.
Java Microservices Architect · 13y
Spring Cloud gRPC Istio
Custom Rate In 2 weeks
Vikram T.
JVM Performance Eng · 9y
Java 21 Virtual threads ZGC
Custom Rate In 3 weeks
+ 34 Java engineers available Java / Spring Boot / JVM Engineers · ready to onboard
Browse all
4.9 · Google
ISO 27001
NDA Day 1
Flexible MSAs
4 time zones across 6 countries
Clutch Top 1%
Hiring Models Tech Stack Process Why Us Compare Engineers Outcomes FAQ Get Started
Our Staff Augmentation

Build with us
like you'd build in-house.

Hire Java developers who join your team, your repo, and your Jira — backed by a 120-engineer Java organization that ships Spring Boot microservices, Kafka event streams, batch jobs, and JVM-tuned trading systems for banks, insurers, and Fortune 500s.

On your team, day 1

Engineers join your Slack, your Jira, your sprint board. They pair with your Java team like senior in-house hires.

Direct git access

They open PRs straight into your repo. You see every controller, every service, every entity, every JUnit test, every Maven dependency.

You manage the work

You set architecture and roadmap. We handle hiring, retention, payroll, benefits, certifications, and laptops.

Engagement Models

Three ways
to hire from us.

Same senior Java bench, different commercial structure. Pick the model that matches your scope — switch any time.

Most popular

Hire a Dedicated Developer

Hourly · Full-time

One senior Java developer joins your team end-to-end. Full control over priorities, workflow, and code reviews.

Request a Quote
  • Full-time on your team
  • Direct Slack + git access
  • Replace within 5 business days
  • No long-term commitment
  • Hourly billing, monthly invoicing
Hire Engineers
For scaling

Dedicated Java Team

Monthly · Tech lead included

A self-contained pod of Java engineers, a Spring architect, and a PM ships microservices and integrations.

Request a Quote
  • Devs + architect + PM + tech lead
  • Sprint-based delivery
  • Quarterly OKR alignment
  • Dedicated client success
  • Direct-hire rights after 12 months
Build My Team
Fixed price

Turnkey Project

Per project · Scoped & fixed

We own scope, design, build, and launch. Fixed price, fixed timeline, ready-to-deploy Java service.

Request a Quote
  • Discovery → scope → fixed bid
  • Milestone-based invoicing
  • Penalty clauses on miss
  • 30 days post-launch support
  • 3-month warranty included
Hire Engineers
Tech Stack

Hire across every
Java capability.

120+ vetted Java engineers across Spring Boot, microservices, batch processing, Kafka, and JVM performance. All in-house. All senior.

 Core Java & JVM

Java 8 / 11 / 17 / 21
Records & sealed classes
Virtual threads (Loom)
Streams & lambdas
CompletableFuture
JVM tuning (G1 / ZGC)
JMH benchmarks
JFR / async-profiler

 Spring Ecosystem

Spring Boot 3
Spring Cloud
Spring Security
Spring Data JPA
Spring Batch
Spring Integration
Spring WebFlux
Spring AI

 Persistence & Data

Hibernate / JPA
MyBatis
jOOQ
Flyway
Liquibase
PostgreSQL
Oracle
MongoDB
Redis

 Messaging & Streaming

Apache Kafka
Kafka Streams
RabbitMQ
ActiveMQ
Pulsar
Avro / Schema Registry
Debezium (CDC)
Camel

 Testing & Build

JUnit 5
Mockito
Testcontainers
REST Assured
WireMock
Maven
Gradle
SonarQube
JaCoCo

 Cloud & Deploy

Kubernetes
Docker
Helm
AWS (ECS / EKS)
Azure AKS
Jenkins
GitHub Actions
Prometheus
Grafana
OpenTelemetry
Hiring Process

From "we need a Java dev"
to onboarded — in 2 weeks.

4-step process. 48 hours to first profile. 2 weeks to a Java developer joining your standup.

01
Day 1-2

Requirement Analysis

We scope your domain — banking, insurance, e-commerce — your Spring version, JDK target, persistence layer, and integration points to match the right Java specialist.

02
Day 3-5

Choose a Resource

3-5 Java developer profiles in 48 hours — matched to Spring Boot, Spring Batch, Kafka, or JVM-tuning depending on your need.

03
Day 6-10

Start an Interview

Interview the shortlist. We support with a live Spring Boot coding round, a JPA / SQL design round, and reference checks.

04
Day 11-14

Onboarding

MSA, NDA, repo access, Jenkins / Sonar credentials. By day 14, your Java developer has merged their first PR.

Why Choose WebSenor

10 reasons enterprises pick us
over for Java over alternatives.

01

5-step vetting

Resume + Java fundamentals screen + live Spring Boot coding test + system-design (microservices, JPA, Kafka) + culture fit. <4% acceptance rate.

02

100% source code authorization

You get complete ownership of clean, well-tested Java source code. Standard MSA assigns IP on day 1.

03

Enterprise Java DNA

Our Java engineers have shipped systems for banks, insurance, telecom, and aviation — they understand audit trails, idempotency, and exactly-once semantics.

04

JVM-performance literate

They profile with async-profiler, tune G1/ZGC, fix N+1 JPA queries, and know when to drop down to virtual threads or reactive.

05

Excellent communication

Clear written ADRs, well-documented PRs, and async-first collaboration. They leave the codebase readable.

06

Replace any time

Not the right fit? Free replacement in 5 business days. No questions asked.

07

Save up to 60%

Senior Java developers at India rates — without agency markup or recruiter fee. Particularly material for long-running enterprise programs.

08

No middlemen

You talk directly to engineers. No account-manager wall, no chinese-whispers PM filtering.

09

Monthly contracts

30-day notice. No multi-year lock-in. Scale your Java team up or down as roadmap shifts.

10

Production Java at scale

They've shipped Spring Boot services handling 30k TPS, Kafka pipelines moving billions of events/day, and batch jobs processing 200M rows nightly.

WebSenor vs. The Alternatives

Compare your
Java hiring options.

How WebSenor stacks against in-house hiring, freelancer marketplaces, and traditional staffing agencies for Java roles.

Factor
★ WebSenor
In-house hire
Freelance marketplace
Time to hire
14 days
3-4 months
7-21 days
Senior Java talent
8+ yr avg
Depends
Mostly junior
Vetting
5-step + live Spring
Your process
Self-reported
Replace any time
Yes, 5-day SLA
No, fire + rehire
Re-search
Source code IP
100% yours, day 1
Yours
Read T&Cs
Spring Boot 3 + Kafka
On bench
Depends
Rare
JVM tuning expertise
Yes
Depends
Rare
Contract length
Monthly
Permanent
Hourly
Sample Profiles

Meet a few of
our our available Java devs.

Anonymized profiles. Real CVs and portfolio links shared after a 30-minute discovery call.

Arun J.

Senior Spring Boot Engineer · 10y

Designed a payment-orchestration service for a top-5 Indian bank — 30k TPS sustained, dual-zone failover, idempotent retries.

Spring Boot 3 JPA Kafka PostgreSQL Kubernetes
IST · Overlaps EU/US
Custom Rate · Now

Meera S.

Java Microservices Architect · 13y

Broke a 1.2M-LOC monolith into 22 Spring Cloud services for an insurance carrier — release cadence: monthly to daily.

Spring Cloud gRPC Istio Resilience4j OpenTelemetry
IST · Overlaps US
Custom Rate · In 2 weeks

Vikram T.

JVM Performance Eng · 9y

Cut GC pauses 96% on a trading platform by moving from G1 to ZGC + tuning heap layout — p99 latency 18ms → 3ms.

Java 21 Virtual threads ZGC JMH async-profiler
IST · Overlaps EU
Custom Rate · In 3 weeks
Outcomes

What teams built
with Java devs from us.

Top-5 Indian bank
Outcome30k TPS, dual-zone HA
StackSpring Boot · Kafka · PostgreSQL

Payment-orchestration Spring service

Top-5 Indian bank · Spring Boot · Kafka · PostgreSQL

Read case study
Global insurance carrier
OutcomeMonthly → daily releases
StackSpring Cloud · gRPC · Istio · K8s

Monolith → 22 microservices

Global insurance carrier · Spring Cloud · gRPC · Istio · K8s

Read case study
Trading platform
Outcomep99 18ms → 3ms, 96% less GC pause
StackJava 21 · ZGC · virtual threads

JVM + GC tuning for low-latency

Trading platform · Java 21 · ZGC · virtual threads

Read case study
Client Voices

What companies say
about hiring from us.

"
★★★★★

The WebSenor Java architect rebuilt our payment service to handle 30k TPS. Our SRE team stopped getting paged at 2am.

HE
Head of Engineering, top-5 Indian bank
"
★★★★★

Breaking up our 1.2M-LOC monolith terrified us. Their Spring Cloud lead made it boring — in a good way. Daily releases now.

VA
VP Architecture, insurance carrier
"
★★★★★

They actually know JVM internals. Our trading p99 dropped from 18ms to 3ms by switching to ZGC and reshaping the heap. Career-grade engineer.

CT
CTO, prop trading firm
Frequently Asked Questions

Everything you need
to know before hiring.

Spring Boot 2 or Spring Boot 3 — do your devs handle both?
Both. Most of our bench ships Spring Boot 3 (Jakarta EE, JDK 17+) but we have engineers maintaining Spring Boot 2 stacks for clients not yet ready to migrate. We can also lead a Spring Boot 2 → 3 / Jakarta migration as a defined engagement.
Which JDK versions are your engineers fluent in?
Daily ship in Java 17 and 21 (virtual threads, records, pattern matching). About 30% of the bench also maintains Java 8 / 11 systems for clients with strict upgrade pipelines.
Can they handle Kafka, not just REST APIs?
Yes. Kafka producers, consumers, Streams, Connect, Schema Registry, exactly-once semantics, and Debezium CDC are core skills on the senior bench.
What about Spring Batch for nightly jobs?
Yes. We have engineers running Spring Batch jobs processing 200M+ rows nightly with chunk-oriented processing, restart, and skip-on-fail policies.
Do you cover JVM tuning and profiling?
Yes. Smaller dedicated bench for low-latency / trading / high-throughput work — async-profiler, JFR, JMH, GC tuning (G1, ZGC, Shenandoah), heap dump analysis. Usually paired with a performance engagement.
What does the 14-day SLA cover?
Day 1 discovery to day 14 first PR. Shortlist day 3-5, interviews day 6-10, MSA + repo access day 11-13, commit by day 14.
What about IP, NDAs, source code?
100% source code authorization standard. MSA assigns IP to you on day 1. NDAs signed before any shortlist.
Do you work in our timezone?
Yes. India team gives 4-6 hours of EU / US East overlap. Engineers join your standups live.
Get Matched in 48 hours

Tell us the role.
We'll send 3-5 profiles.

Share what you're hiring for — role, stack, timezone, when you need them. We'll come back within 48 hours with 3-5 hand-picked Java / Spring Boot / JVM Engineers, full CVs, case studies, and rate cards.

What you'll get

3-5 matched profiles in 48h
Full CVs + portfolio links
Transparent rate cards
Interview slots within 1 week
5-day trial window
Flexible MSA & NDA templates

Request Java Profiles

Free · No commitment · 48-hour response
SOC 2 secure · NDA signed before any IP shared · No spam
The Numbers

120+ Java engineers · 13+ years · 3500+ projects

120+

Java engineers

600+

Java systems shipped

60%

Cost vs onshore

14-day

Time to hire
Free · 48-hour profile turnaround

Hire your Java team
in 2 weeks.

3-5 senior Java developer profiles in your inbox within 48 hours. Free. No commitment. No sales pitch.

Request Profiles  See Outcomes