Our Services

Add AI. Modernise. Scale.

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.

01  How we help

Add AI · Modernise · Scale

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.

Explore Spring AI
02  What We Do

Eight things, done properly

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.

/01

Spring AI & RAG

Retrieval-augmented generation, semantic search and MCP servers inside your existing Spring Boot app — grounded in your data, portable across OpenAI, Azure or self-hosted models.

/02

Event-Driven Microservices

Spring Boot services on Kafka with the transactional outbox, idempotent consumers, dead-letter handling and circuit breakers — so a failed stage never becomes a lost order.

/03

Legacy Java Modernisation

Java 8/11 monoliths taken apart with the strangler-fig pattern and moved to Java 21 — route by route, with the old system still serving traffic and a rollback at every step.

/04

Data Migration at Scale

Apache Spark pipelines that are idempotent and resumable, with row-level and aggregate reconciliation between source and target — a failed run picks up where it stopped instead of corrupting the target.

/05

Cloud-Native & GitOps

Terraform for infrastructure, Helm and ArgoCD for delivery, Kubernetes on AWS or GCP — every environment reproducible from a commit, not from someone's laptop.

/06

Resilience & Observability

Circuit breakers, bulkheads, retries with backoff and sane timeouts — plus traces, metrics and structured logs, so you find the failing hop in minutes rather than guessing.

/07

QA & Performance Testing

Unit, integration and end-to-end suites, Testcontainers for real dependencies, k6 and JMeter load profiles, and SAST scanning wired into CI — reliability you can point at, not assert.

/08

Front Ends for Java Teams

React and Next.js interfaces built against your own APIs — including the chat, search and admin surfaces that AI features need in order to be useful to a human.

03  Technology Expertise

The stack we engineer with

Java 21Spring BootSpring AIMicroservicesApache KafkaApache SparkPostgreSQL & pgvectorElasticsearchAWSGoogle CloudKubernetesTerraformDockerReact & Next.jsFlutterPython
04  Engagement Models

Ways to work with us

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.

Talk to an architect