Three things a Java platform usually needs, in the order it usually needs them. Spring AI integration, strangler-fig modernisation of legacy monoliths, and the event-driven, observable backbone that keeps both standing under real load.
Each of these names the actual pattern we'd apply, because you deserve to know what you're buying before the kick-off call — not after it.
Add AI
Spring AI drops into your existing Spring Boot codebase. RAG grounds answers in your own data, with citations, so the model works from facts instead of inventing them — and swapping OpenAI for a self-hosted model stays a configuration change.
RAG with grounded, cited answers
Vector search — pgvector, Elasticsearch, Redis
MCP servers, tool calling & agents in Java
Guardrails, token budgeting & offline eval
Modernise
Strangler-fig decomposition, route by route, behind a facade. A transactional outbox keeps events and state consistent through the cutover, and every step has a rollback. Nothing goes dark on a Friday night.
Strangler-fig monolith decomposition
Java 8/11 → Java 21 upgrade paths
Transactional outbox & CDC for safe cutover
Apache Spark migrations, reconciled row-by-row
Scale
Kafka topics with idempotent consumers and dead-letter handling. Circuit breakers, bulkheads and timeouts on every remote call. Traces, metrics and structured logs, so the failing hop is found in minutes, not guessed at.
Event-driven services on Apache Kafka
Circuit breakers, bulkheads, retries with backoff
Distributed tracing, metrics & structured logs
k6 / JMeter load profiles wired into CI
Featured: Spring AI integration & consulting
Add RAG, semantic search, chat and MCP servers to your Java apps — explore our dedicated Spring AI services.
We do not claim to do everything. This is the list — Spring AI at the front, and the backend depth underneath it that makes an AI feature survive a real production load.
Flexible engagement models that fit businesses of every size — from fast-moving startups to large enterprises.
Dedicated Team
A senior, embedded squad of architects and lead developers that works as an extension of your team — same faces, week after week.
Project-Based
Fixed-scope delivery for a defined platform, AI feature or migration, with clear milestones and transparent reporting.
Staff Augmentation
Drop Spring Boot, Kafka or Spring AI specialists into your team to close a specific capability gap fast.
05 FAQ
Frequently asked questions
What services does Hello World Tech Consulting offer?
Three, in the order most Java platforms need them. First, Spring AI integration: RAG, vector search, chat and MCP servers built inside your existing Spring Boot app. Second, modernisation: strangler-fig decomposition of legacy monoliths and Java 8/11 to Java 21 upgrades, plus large-scale Apache Spark data migration. Third, scale: event-driven Kafka services with circuit breakers, tracing and load testing, delivered cloud-native on AWS, GCP and Kubernetes.
Which engagement models do you offer?
Three: a dedicated senior team that works as an extension of yours, fixed-scope project delivery with clear milestones, and staff augmentation to fill specific Spring Boot or Java capability gaps fast.
What is your technology stack?
Java 17 to 21, Spring Boot, Spring Security, JPA/Hibernate, Apache Kafka, Apache Spark, Spring AI with OpenAI or self-hosted LLMs, Elasticsearch, PostgreSQL, Docker and Kubernetes, on AWS and GCP.
Do you work fixed-price or time-and-materials?
Both. Fixed-scope projects are milestone-based with transparent reporting; dedicated-team and staff-augmentation engagements run on a monthly basis. Tell us the shape of the work and we'll recommend the model.
Have a project in mind? Let's scope it together.
Tell us about your application and goals — we'll map the engineering path.