Software Development
Reactive Microservices Training
Build resilient, non-blocking services with Project Reactor, WebFlux, R2DBC and Kafka
- Duration
- 24 hours
- Format
- Live online
- Modules
- 10 modules
- Certificate
- On completion
- ✓24 hours of live instructor-led training in scheduled batches
- ✓Reactive Streams, Mono and Flux with Project Reactor
- ✓Spring WebFlux controllers, functional endpoints and WebClient
- ✓Non-blocking data access with R2DBC and reactive MongoDB or Redis
- ✓Reactive Kafka messaging, backpressure and Resilience4j
- ✓Comparison with virtual threads so you choose the right model
About the course
What this course covers
Reactive programming handles many concurrent requests with a small number of threads by never blocking while waiting for I/O. It suits services with heavy I/O, streaming data or many slow downstream calls. This course teaches the reactive model in Java using Project Reactor and Spring WebFlux, and applies it to microservice patterns.
You start from the Reactive Streams specification and learn Mono and Flux operators, error handling, schedulers, context and backpressure. You then build WebFlux services with annotated and functional endpoints, call other services with WebClient, access databases with R2DBC, and exchange events through reactive Kafka. You also test with StepVerifier and WebTestClient, debug reactive pipelines, and compare the approach with Java 21 virtual threads so you can make a balanced choice.
There is no external vendor exam. The course ends with a reactive microservice project, and you receive an Assure Success course-completion certificate on completion.
Who should attend
- ● Spring Boot developers who want to learn the reactive stack
- ● Backend developers building high-concurrency or streaming services
- ● Architects evaluating reactive vs virtual-thread designs
- ● Java developers who have seen Mono and Flux in projects and want to understand them
- ● Developers working on API gateways and event-driven systems
Prerequisites
- Good core Java knowledge including lambdas, streams and generics
Key skills
Skills you will walk away with
Reactive Streams concepts
Explain publishers, subscribers, subscriptions and backpressure.
Project Reactor
Compose Mono and Flux pipelines with transformation, combination and error operators.
Spring WebFlux
Build non-blocking REST services with annotated controllers and functional routes.
WebClient
Call other services reactively with timeouts, retries and error mapping.
Reactive data access
Use R2DBC, reactive MongoDB and Redis without blocking threads.
Reactive messaging
Produce and consume Kafka events using Reactor Kafka or Spring Cloud Stream.
Curriculum
Module-by-module syllabus
10 modules · 46 topics · 24 hours
1Module 1: Why Reactive?5 topics ▾
Learning objective: Understand the problem reactive programming solves.
- ▸ Blocking vs non-blocking I/O
- ▸ Thread-per-request limits
- ▸ Reactive Streams specification
- ▸ Reactive vs virtual threads in Java 21 and 25
- ▸ When not to go reactive
2Module 2: Project Reactor Basics5 topics ▾
Learning objective: Create and subscribe to streams.
- ▸ Mono and Flux
- Cold vs hot publishers
Schedules
Upcoming live batches
Enroll now and choose your batch dates
Send an enquiry and we'll reserve your seat in the next batch.
Certification
How you get certified
- 1Enrol in the next scheduled live batch and install JDK 21 or later, Maven, an IDE and Docker
- 2Attend live sessions and complete the lab for each module
- 3Build the reactive project service and keep it in a Git repository
- 4Present the project and its load-test results in the final session
- 5Receive the Assure Success course-completion certificate (a training certificate, not a vendor exam credential)
Career outcomes
Roles this opens up
Reactive / WebFlux Developer
₹8–20 LPA (approx.)Builds non-blocking services for high-throughput systems.
Senior Backend Engineer (Java)
₹10–25 LPA (approx.)Designs and tunes concurrent back-end systems.
Microservices Developer
₹7–20 LPA (approx.)Works on event-driven service architectures.
Streaming / Integration Engineer
₹8–20 LPA (approx.)Builds pipelines that process continuous event data.
Salary ranges are approximate figures for India and vary by city, company and experience.
Why this certification is worth it
Efficient resource use
Handle many concurrent connections with few threads.
Natural fit for streaming
Why Assure Success
Learn it once, pass it once
Trainers from the field
Every session is led by a practitioner who uses this material at work.
Batches that fit your week
Weekday and weekend batches in IST, scheduled for working professionals.
Exam-style practice
Practice questions and, where available, a full simulator free with the course.
Exam voucher help
Discounted vouchers and step-by-step help booking your exam.
Human support
WhatsApp support Mon–Sat, 9 AM–8 PM IST — a person answers.
Pay your way
UPI, cards, netbanking and EMI in India; international cards accepted.
FAQs
Questions learners ask us
Q.Is reactive programming still relevant with Java virtual threads?
Yes, in specific cases: streaming, backpressure and very high-concurrency I/O. For ordinary request-response services, virtual threads with Spring MVC are often simpler. The course teaches how to choose.
Q.Is reactive programming hard to learn?
It needs a mindset change because nothing runs until you subscribe, and debugging is different. Regular practice with operators makes it manageable.
Q.Do I need to know Spring Boot first?
Yes. You should already build REST services with Spring Boot before taking this course.
Q.Is there a certification exam?
No. You get a course-completion certificate and a working project.
Q.Which database drivers do you use?
R2DBC for PostgreSQL, and reactive drivers for MongoDB and Redis. JDBC and JPA are blocking and not used in reactive paths.
Q.Do you cover RxJava?
The course uses Project Reactor, which is the standard in Spring. The concepts transfer to RxJava.
What is the difference from the microservices course?
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Reactive Microservices Training