62 docs tagged with "microservices"

A comprehensive guide to advanced, scenario-based, and practical Spring Boot interview questions.

A comprehensive guide covering real technical interview questions and answers from an Accenture Java Developer interview for a candidate with 3 years of experience.

A detailed collection of technical interview questions and answers from a real Accenture Java Developer interview, covering Core Java, Spring Boot, and Microservices.

A detailed collection of real interview questions and answers from an Accenture Java Developer interview. Ideal for candidates with 3+ years of experience, covering Core Java, Spring Boot, Hibernate, and Microservices.

Deep dive into the API Composition pattern — parallel fan-out with CompletableFuture and virtual threads, partial response degradation, the N+1 composition problem, batch APIs, and comparison with CQRS.

Deep-dive into the Backend for Frontend pattern — aggregation mechanics, parallel fan-out, GraphQL BFF, OAuth Token Handler, response shaping, caching strategies, observability, and production failure modes for senior Spring Boot engineers.

Deep dive into Blue-Green Deployment — zero-downtime releases, instant rollback, Kubernetes implementation, database migration compatibility (expand-contract), CI/CD pipeline integration, and comparison with canary and rolling updates.

Comprehensive guide to the Bulkhead pattern — Thread Pool vs Semaphore isolation internals, Resilience4j configuration, pool sizing heuristics, integration with Circuit Breaker and Rate Limiter, observability, and production failure modes.

A good architecture supports independent developability, deployability, and operability. Martin explains the use-case, operational, and deployment decoupling modes and why the monolith-vs-microservices decision can and should be deferred.

The Main Component is the dirtiest place in the system — where everything is wired together. Services are not architecturally special. Tests are a component too — they must respect boundaries or become a maintenance burden.

Deep-dive into the Circuit Breaker pattern — state machine internals, sliding window mechanics, Resilience4j configuration, bulkhead integration, fallback strategies, observability, and production failure modes for senior Spring Boot engineers.

A detailed collection of real interview questions and answers from a Cognizant Java Developer interview for a candidate with 3 years of experience. Covers Spring Boot, Microservices, Performance Optimization, and System Migration.

Complete guide to Consumer-Driven Contract Testing in microservices, detailing Pact framework integration, CI/CD setup, and trade-offs.

Comprehensive guide on Command Query Responsibility Segregation (CQRS) and Event Sourcing, detailing architecture, implementation patterns, comparisons with alternatives, and deep dives for senior engineers.

Transactional Outbox, Saga, CQRS, Event Sourcing, database-per-service, and data consistency patterns in distributed architectures.

Technical guide to the Database-per-Service pattern, comparing data access options like API Composition, CQRS, and transaction management.

Detailed explanation of debit reversals, compensating transactions, and rollback strategies in banking ledgers.

A comprehensive guide covering real technical and managerial interview questions from a Deloitte Java Developer interview for a candidate with 4 years of experience.

A comprehensive guide covering real technical interview questions and answers from a Deloitte Java Developer interview (4 years experience). Covers Core Java, Concurrency, Spring Boot, Microservices, and System Design.

Deep dive into Distributed Tracing for microservices using OpenTelemetry, W3C TraceContext, Spring Boot 3 Micrometer, and Jaeger.

Master guide to distributed transactions in microservices — Two-Phase Commit (2PC), Saga Pattern (Choreography vs. Orchestration), Transactional Outbox + CDC, and NewSQL architectures.

Practical DDD for system design interviews and production architecture, including bounded contexts, aggregates, context mapping, and migration patterns.

Complete guide to Envoy Proxy, its architecture, dynamic configuration via xDS API, static setups, and system-design benefits.

A comprehensive collection of real interview questions and answers from an EPAM Java Developer interview. Ideal for candidates with 3 years of experience, covering Core Java, Spring Boot, Microservices, and Memory Management.

A comprehensive guide covering real technical interview questions and answers from an EPAM Java Developer interview for a candidate with 3 to 7 years of experience.

In-depth guide to Event-Driven Microservices, covering domain events, event types (notification vs carried-state vs sourcing), choreography sagas, transactional outbox pattern, schema evolution, ordering, idempotency, and Kafka setups.

Deep dive into Externalized Configuration — 12-Factor App principle III, Spring Cloud Config Server with Git backend, hot-reload via Spring Cloud Bus, Kubernetes ConfigMaps/Secrets, HashiCorp Vault, and configuration hierarchy.

Deep dive into Feature Toggles — 4 toggle types, trunk-based development, percentage rollout, A/B testing, LaunchDarkly vs DB-backed implementation, toggle debt, and testing strategies.

A comprehensive collection of real interview questions and answers from an IBM Java Developer interview. Ideal for candidates with ~3 years of experience, covering Java 11 features, Microservices (Saga), Spring Boot Internals, and SOLID principles.

A detailed collection of real interview questions and answers from an Infosys Java Developer interview. Ideal for candidates with ~3 years of experience, covering Java 8, Multithreading, Garbage Collection, Spring Boot, and Microservices.

Senior-level Java, Spring Boot, and microservices interview questions for experienced backend engineers.

An in-depth, highly detailed breakdown of a Senior Java Developer interview covering advanced Spring Boot, architectural migrations, database decoupling, and JVM memory concepts.

Comprehensive guide to Kubernetes networking concepts, including Container Network Interface (CNI), Service Types, Kube-proxy, and Ingress.

Comprehensive guide to the Log Aggregation pattern — ELK/EFK stack, structured logging, MDC enrichment, Spring Boot implementation, Loki/Grafana alternative, alerting, and production gotchas.

Deep dive into the Microservice Chassis pattern — building a Spring Boot auto-configuration starter that standardizes logging, tracing, error handling, health checks, security headers, and Resilience4j defaults across all services.

Comprehensive guide to microservices design patterns including API Gateway, Circuit Breaker, Service Mesh, Sidecar, Strangler Fig, Bulkhead, and service discovery in Spring Cloud.

A comprehensive list of technical interview questions and answers from a real Nagarro Java Developer interview for a candidate with 3 to 5 years of experience.

Deep dive into Distributed Tracing Sampling Strategies with OpenTelemetry Collector, Tail-based vs Head-based sampling, Multi-Collector Load-Balancing, memory protection, and cloud storage cost optimization.

A detailed collection of real technical interview questions and answers from an Oracle Senior Java Backend Developer interview (5 years experience). Covers System Design, Spring Boot, Microservices, and Core Java.

Payment Hub vs Payment Gateway vs Payment Factory — architecture patterns, orchestration, channel abstraction, and Java/Spring engineering design for centralised payment processing.

A comprehensive list of technical interview questions and answers from a real PwC Java Developer interview for a candidate with 3 years of experience. Covers Concurrency, Spring Boot, Microservices, and Database Locking.

A massive compilation of real-time, tricky, and scenario-based Spring Boot interview questions. Covers Microservices, Security, Performance, Caching, and Deployment.

Comprehensive guide to the Retry pattern in microservices — transient vs. persistent errors, exponential backoff, jitter algorithms, idempotency, Resilience4j, distributed retry coordination, and integration with Circuit Breaker and Bulkhead.

A comprehensive guide to the Saga Pattern — from core concepts for beginners to choreography vs orchestration internals, state machine design, idempotency, compensating transactions, temporal coupling, failure taxonomy, and production observability for senior engineers.

A comprehensive list of scenario-based Spring Boot interview questions covering scaling, security, API integration, deployment, and performance optimization.

Strategic guide to microservice decomposition, applying Domain-Driven Design (DDD), high cohesion, loose coupling, and avoiding the distributed monolith.

Detailed guide to Service Discovery in microservices, comparing Client-side vs Server-side discovery, Spring Cloud Eureka vs Kubernetes CoreDNS/Kube-proxy.

Deep-dive into Service Mesh architecture — Envoy internals, xDS API, mTLS certificate lifecycle, traffic management patterns, observability, Spring Boot integration, and production failure modes for senior engineers.

Deep-dive into the Sidecar pattern — Linux namespace internals, Kubernetes native sidecar lifecycle, PgBouncer connection pooling, Vault secrets injection, config hot-reload, Spring Boot integration, and production failure modes for senior engineers.

Overview of Spring Boot, its core benefits, and why it is widely used for modern Java backend and microservice development.

A detailed collection of tricky and advanced Spring Boot interview questions and answers, covering microservices, caching, performance optimization, and application configuration.

A collection of challenging Spring Boot interview questions covering architecture, security, scaling, and configuration.

A collection of advanced and scenario-based Spring Boot interview questions focusing on security, resilience, serverless functions, and testing.

A collection of tricky and challenging Spring Boot interview questions focusing on auto-configuration, deployment, error handling, distributed tracing, and reactive programming.

Complete guide to Spring Cloud, covering Service Discovery (Eureka), Config Server, API Gateway, Circuit Breakers, Distributed Tracing, internal workings, integration patterns, pros/cons, and interview questions.

Guide to the Strangler Fig pattern for migrating monoliths to microservices. Details bounded context mapping, Anti-Corruption Layer (ACL) Spring Boot code, dual-writing data sync, eventual consistency, and migration gotchas.

A comprehensive collection of real interview questions and answers from a TCS Java Developer interview. Ideal for candidates with ~3 years of experience, covering Core Java, API Security, Spring Boot, and Microservices.

A detailed collection of real interview questions and answers from a TCS Java Developer interview. Ideal for candidates with 3.5 years of experience, covering Core Java, Multithreading, Spring Boot, and Microservices.

A comprehensive collection of real interview questions and detailed answers from a Tech Mahindra Java Developer interview. Ideal for candidates with ~3 years of experience, covering Core Java, Spring Boot, Microservices, and API Design.

A detailed collection of real interview questions and answers from a Walmart Java Developer interview. Ideal for candidates with 3+ years of experience, covering DSA, Core Java, System Design, Spring Boot, and Kafka.

Deep dive into Webhooks — event-driven HTTP callbacks, HMAC-SHA256 signature verification, idempotency, retry with exponential backoff, delivery guarantees, building a webhook delivery system, and security best practices.

A comprehensive list of technical interview questions and answers from a real Wipro and ICICI Bank client interview for a Java Developer (3-4 years experience).