Hire Java Developers in Türkiye: Spring Boot Experts

Last updated: November 11, 2026

Hiring Java developers through 360 Soft gives you engineers from Istanbul who build and maintain enterprise back ends, Spring Boot microservices, integrations and high-volume transactional systems. You can add one Java developer to your team or build a complete squad with a lead, developers and QA; teams range from 1 to 200+ people and a typical start is within 1–2 weeks. Developers work remotely, on-site or in a hybrid model under a service agreement with 360 Soft. This page is part of our hire developers in Türkiye services.

Who needs Java developers

Banks, payment providers and insurers running core systems, payment switches and integration layers on the JVM.
Enterprises with large Spring or Jakarta EE applications that need maintenance, modernisation or upgrades.
SaaS companies building scalable microservices with Spring Boot, Kafka and Kubernetes.
Telecom, logistics and retail companies with high-throughput back-end systems.
Teams moving from Java 8 or 11 to a current LTS release, or from Spring Boot 2 to 3.

When Java is the right choice

Java remains one of the safest choices for long-lived business systems: a mature ecosystem, strong typing, excellent tooling, predictable performance on the JVM and a large talent pool. It is a strong fit for transactional systems, complex domain logic, integration-heavy back ends and regulated environments where stability and long-term support matter more than the newest framework. For lightweight scripts, data science or very small APIs, Python or Node.js may be quicker; we will tell you honestly if another stack fits your case better.

What a leased Java developer takes on

Designing and building REST and gRPC APIs and microservices with Spring Boot.
Integrations with message brokers (Kafka, RabbitMQ), payment systems, ERP and third-party APIs.
Database design and data access with JPA/Hibernate, jOOQ or plain SQL on PostgreSQL, Oracle or SQL Server.
Version upgrades, refactoring of legacy monoliths and gradual service extraction.
Automated tests (JUnit, Testcontainers), CI/CD pipelines and code reviews.
Performance analysis, JVM tuning and production support.

Java developer seniority matrix

Level	Typical experience	What they own
Mid-level	3–5 years	Features and services within an existing architecture, with code review
Senior	5–8 years	Service design, complex integrations, performance work, mentoring
Lead / architect	8+ years	Architecture decisions, modernisation roadmaps, technical leadership of the squad

Spring and JVM ecosystem

Area	Technologies
Language and runtime	Java 17 and 21 LTS, Kotlin on the JVM, GraalVM where needed
Frameworks	Spring Boot, Spring Cloud, Spring Security, Spring Batch, Quarkus, Micronaut, Jakarta EE
Data	JPA/Hibernate, jOOQ, Flyway, Liquibase, PostgreSQL, Oracle, SQL Server, MongoDB, Redis
Messaging	Apache Kafka, RabbitMQ, ActiveMQ
Testing	JUnit 5, Mockito, Testcontainers, REST Assured, ArchUnit
Build and delivery	Maven, Gradle, Docker, Kubernetes, GitHub Actions, GitLab CI, Jenkins
Observability	Micrometer, Prometheus, Grafana, OpenTelemetry, ELK

What we cover in technical assessment

Core Java: collections, concurrency, memory model, streams and modern language features.
Spring Boot internals, dependency injection, transactions and security configuration.
API and service design, including error handling, versioning and idempotency.
SQL and data modelling, N+1 problems and transaction boundaries.
A practical coding task with tests, followed by a code-review discussion.
Communication in English and the ability to explain trade-offs.

Working models

Model	How it works	Best for
Staff augmentation	The developer joins your team, tools and sprints; you lead the work	Teams that need extra capacity or a specific skill
Dedicated team	360 Soft assembles a team (developers, QA, lead) that works only for you	Products that need a stable, long-term team
Project-based delivery	We deliver an agreed scope with our own team and project management	Well-defined projects with a clear outcome

All models can be remote, on-site or hybrid, with agreed overlap hours for EU, UK or Gulf time zones. 7/24 shifts are possible for support and operations work.

Recommended team compositions

Need	Suggested composition
Extra capacity in an existing team	1–2 senior or mid-level Java developers
New microservice or module	1 lead, 2–3 Java developers, 1 QA engineer
Modernisation of a monolith	1 architect, 3–5 Java developers, 1 DevOps engineer, 1–2 QA engineers
Product squad	Java back end plus front-end developers (React or Angular), QA and a Scrum Master

Process and typical timelines

Step	What happens	Typical duration
1. Needs analysis	Stack, seniority, duration, time zone, security requirements and team setup	1–2 days
2. Shortlist	Technically assessed profiles	3–7 days
3. Interviews	You interview and choose; optional paid trial task	2–5 days
4. Contract and onboarding	Service agreement, NDA, accounts and repository access	Typical start in 1–2 weeks overall
5. First sprint	First merged pull requests and a review of the fit after 2–4 weeks	First month

Leasing, permanent hire and freelancers

Criterion	Permanent hire	Freelancer	Leased via 360 Soft
Time to start	Often 2–4 months	Fast, availability varies	Typically 1–2 weeks
Continuity	High	Risk of leaving mid-project	Replacement process if the fit is not right
Employer obligations	On you	Contract risk depends on your country	With 360 Soft under Turkish labour law
Scaling	Slow	One person	From 1 to 200+ people
Code ownership	Yours	Must be agreed carefully	Yours, through IP assignment

KPI and SLA table

KPI	What it shows
Cycle time	Time from starting a ticket to merging it
Sprint commitment reliability	Planned versus completed work over several sprints
Escaped defects	Bugs found in production after release
Code review turnaround	How quickly pull requests are reviewed and merged
Test coverage on new code	Automated test coverage of changed code
Service availability and latency	For production services: uptime and response time against agreed targets

Targets are agreed individually; we do not promise fixed improvement percentages.

Factors that affect the price

We do not publish prices because every engagement is scoped individually. The main factors are:

Factor	Effect
Seniority	Leads and architects cost more than mid-level developers
Specialisation	Banking and payments, Kafka-heavy architectures or legacy Jakarta EE experience
Language	Fluent English or additional languages such as German
Working model	On-site work and travel add cost compared with remote
Duration and allocation	Full-time or part-time; longer engagements are usually priced more favourably
Working hours	Overlap with distant time zones or 7/24 shift coverage

Risks and mitigations

Risk	Mitigation
Legacy code nobody understands	Code reading period, architecture notes and characterisation tests before changes
Upgrade breaks production	Incremental upgrades, automated tests and staged rollouts
Communication gaps	Agreed overlap hours, English-speaking developers, written updates in your tools
Knowledge concentrated in one person	Code reviews, documentation and pairing; optional second developer
Poor fit	You interview and choose; replacement process with handover

Confidentiality, data protection and IP

The Java developer works under a B2B service agreement between your company and 360 Soft; there is no employment relationship between you and the specialist. The standard package includes a mutual NDA, an IP assignment clause under which all work product, documentation and code created for you belongs to you, and written access rules for your systems.

EU/EEA buyers: a GDPR Data Processing Agreement (Art. 28) with Standard Contractual Clauses for transfers to Türkiye.
UK buyers: the UK International Data Transfer Agreement (IDTA) or the UK Addendum to the SCCs.
Türkiye: the team operates under KVKK (Law No. 6698), the Turkish personal data protection law.
Access hygiene: named accounts, least-privilege access, MFA, your VPN or VDI where required, and access revoked on the last day.

Legal note

The specialist is employed by 360 Soft under Turkish labour law; payroll, social security and statutory obligations remain with us. This page is general information, not legal advice. Sector rules in Türkiye (for example BDDK for banking or SPK for capital markets) apply to work done there, and the local rules of your own country also apply; please have the agreement reviewed by your legal counsel.

Illustrative scenario: Spring Boot 2 to 3 upgrade and service extraction

Illustrative scenario: a payments company runs a large Spring Boot 2 monolith on Java 11 that is approaching end of support. A team of one Java lead and three Java developers joins remotely. They first add integration tests with Testcontainers around the critical flows, then upgrade to Java 21 and Spring Boot 3 in small steps, and finally extract the notification and reporting modules into separate services behind Kafka. This is an example of how a team can be used, not a report of a specific client result.

Java developer selection checklist

Which Java and Spring versions do you run today, and which do you target?
Is the work new development, maintenance, modernisation or all three?
Which databases, brokers and cloud platforms are involved?
Do you need one developer, a squad, or a lead to set the architecture?
What overlap hours and language do you need?
How will code review, testing and deployment work?
Are NDA, IP assignment and data protection terms agreed before repository access?

Frequently asked questions

Which Java versions do your developers work with?

Mainly Java 17 and 21 LTS, and also older versions such as Java 8 and 11 for maintenance and upgrade projects.

Do your developers know Spring Boot?

Yes. Spring Boot is the most common framework in our Java assessments, together with Spring Security, Spring Data and Spring Cloud.

Can you help us modernise a legacy Java monolith?

Yes. We typically start with tests and an architecture review, then upgrade and extract services step by step.

Do you provide Kotlin developers too?

Yes, Kotlin on the JVM can be requested alongside or instead of Java.

Can Java developers work in our time zone?

Yes. Türkiye overlaps well with European and Gulf business hours, and overlap hours are agreed before the start.

How quickly can a Java developer start?

The typical start is within 1–2 weeks after the brief.

Can I build a whole Java team?

Yes. We can provide a squad with a lead, developers, QA and DevOps, and scale from 1 to 200+ people.

Do I interview the developers myself?

Yes. We assess candidates technically first, and you interview the shortlist and decide.

Who owns the code?

You do. The service agreement includes an IP assignment clause, and the code lives in your repositories.

What happens if a developer is not the right fit?

We start the replacement process and arrange a handover so the sprint work continues.

Talk to us about your team

Tell us your Java stack, the work to be done, the number of developers and your target start date. We reply with developer profiles and an indicative timeline. Call +90 850 335 10 87, message us on WhatsApp, email info@360-soft.com or use our contact page.

360 Soft Marketing Yazılım ve Danışmanlık Ltd. Şti. · Nidakule Ataşehir Batı, Barbaros Mah. Begonya Sk. No:1 D:2, 34746 Ataşehir/İstanbul, Türkiye.

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