Mateo
Full Stack Developer
ReactNode.jsPythonTypeScriptNext.jsMongoDBAWSAIAPIs
Shakers for companies
Work with a senior Java Developer
A certified Java Developer who joins where your system already lives: the banking, insurance or government monolith nobody dares to touch, the Spring Boot microservices renewing it piece by piece, the Kafka and the Oracle holding the business every day.
Senior tech talent for the system already running in production: starting within days against the 4-8 weeks of a classic process, with contract, milestones and oversight from Shakers.
- Certified talent in AI and agent skills
- Meet up to 3 AI Builders in 72 h
- Flexible collaboration models
+600
European clients across different industries
Top 4%
We work with the top 4% of certified talent in our community
72 hours
Meet 3 certified candidates in under 72 h
4.7/5
Our clients' satisfaction on Trustpilot
The talent mix your company needs
At Shakers you will find AI Engineers, Java Developer and specialists across Tech, Product and Data
Ana
DevOps Engineer
DockerCI/CDAWSAzureKubernetesTerraformAmazon Bedrock
Lucas
Backend Developer
Node.jsPythonJavaGoPHPMySQLMongoDBDocker
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Emma
Security Engineer
Burp SuiteOWASP ZAPMetasploitNmapNessusTrivySnyk
Java Developer: what this role brings to your project
A Java Developer builds and sustains the enterprise systems that run in production on the JVM: services with Spring Boot, the REST APIs the rest of the business consumes, data access with SQL, JPA or the company's Oracle and messaging with Kafka. Their territory is the whole ecosystem, from the framework to the LTS version: when the brief names Java or Spring, the filter starts with the language and its database, not with the generic backend role.
Java 21Spring BootMicroservicesREST APIsKafkaSQLOracleJPA/HibernateMavenDockerKubernetesCI/CDJenkinsJWT/OAuth2AngularKotlin
One provider. One contract. Full traceability
How Shakers works for your company
Post your project
Tell us about the project, its scope, the expertise you need and when you want to get to work.
You get three options
We match your brief against certified talent and introduce the three AI Builders who fit best.
The last word is yours
Meet the three specialists and choose who you collaborate with; we handle the rest.
Why work with Shakers
The advantages of adding this profile with Shakers
Spring Boot on your LTS version
Spring Boot on your system's LTS: from the Java 21 of the new to the extended support still holding the legacy.
Kafka, queues and the company Oracle
Messaging with Kafka, data with SQL and JPA, and the house Oracle: the whole ecosystem, not a loose language profile.
REST APIs that break nobody
Versioning an endpoint without breaking whoever consumes it: contracts, tests and documented deployment for the handover.
From monolith to microservice
Renewing in production without stopping the system: which service to extract, what goes to queues, what stays.
Deployment with its own pipeline
The jar does not end up on someone's machine: Docker, CI/CD and Jenkins in the team's flow, and Kubernetes when needed.
Capacity without growing headcount
A senior Java Developer by project, no hiring process: they join certified on top of your repository and your environments.
When do I ask for a Java Developer and not a generic backend?
When the brief names the ecosystem: Spring Boot, Kafka, the company Oracle or the LTS running in production. Asking for a backend with no surname narrows nothing; the filter starts with the language.
How long does it take to start with a senior Java Developer?
A classic selection process takes 4 to 8 weeks; here matching presents up to three certified profiles in 72 hours and kickoff gets agreed in days, with scope closed before starting.
Can they enter a legacy banking or government system?
It is their natural territory: monoliths with years in production, live SOAP integrations, PL/SQL over Oracle and business rules written nowhere.
Is Spring Boot a must in a Java Developer?
In Spanish practice, yes: it is the literal title of the market's ads and the dialect almost every new service gets built with. The senior masters it with the whole ecosystem, from Maven to Kafka.
How much does a project with a senior Java Developer cost?
Scope sets it: which API or microservice gets delivered, on which system and with how much maintenance. At Shakers the budget closes per project before kickoff.
Can a Java Developer by project keep my system in production?
Yes, and it is the most frequent brief: keeping what already runs by milestones, with access and deliverables defined at the start, and a documented handover so your team stands on its own.
What gets delivered in the first weeks
The dependency map of the service that hurts, the first versioned API that breaks no integration, the documented deployment and the migration of the monolith, in phases, towards cloud-native.
A market measured in Spring Boot
1,157 active tech job ads in Spain ask for Spring Boot and 3,384 carry java among their skills (Shakers market analysis, n=31,162, September 2026): the demand exists, it is enterprise, and the certified-by-project profile is missing.
Where the Java Developer ends
Java is a backend with a surname: if the brief names Spring, Kafka or your Oracle, the filter starts with the ecosystem. The java backend formula, the only one growing, is born there.
The brief arrives with the symptom
Weeks waiting for someone to touch that service. Scope closes before kickoff: which API, which microservice, which stretch of the monolith.
Connect with AI specialists to build your next project
Find specialists in Tech, Product, Data to complement your team
Backend Developer
Java is a backend with a surname: this page goes deeper into the ecosystem (Spring, Kafka, JVM); with no language in the brief, the filter is the backend's.
Full Stack Developer
The market posts the mixed profile as an ad (Java with Angular or React): the interface half of the brief is shared with this page, and the project cuts.
Test Automation Engineer
Enterprise QA tests what the java holds: regression over APIs and services in production, with suites running in the team's own pipeline.
DevOps Engineer
The modern jar deploys in a container: their CI/CD pipeline and the cluster where the microservice runs set the daily border with the java.
The AI talent you need Certified by Shakers
We introduce you to three ready_to_build AI Builders in 72 hours.
