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HIIS
Services

Backend Development

Robust, scalable server-side systems that power your product.

Scalable, secure APIs and event-driven systems in Scala, Java, Python and Node.

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api.scala
def submit(req: Request): IO[Response] =
  for
    data <- req.as[Contact]
    _    <- service.save(data)
  yield Response(Status.Ok)
# scalable, typed, concurrent
api-gateway.log
POST/api/orders20124ms
GET/api/inventory/SKU-44212008ms
PUT/api/orders/ord_9812/fulfill20031ms
POST/api/notifications/send2025ms
avg 17ms · 99.98% uptime

What we deliver

01

REST & GraphQL APIs

02

Event-driven & microservice architectures

03

Databases, caching & message queues

04

Cloud deployment with Docker & Kubernetes

Use cases

Real problems we solve for teams like yours.

01

API-first platforms

Design RESTful or GraphQL APIs that become the backbone of a scalable product ecosystem.

02

Real-time data pipelines

Stream events, process data in flight, and keep every consumer in sync with Kafka and event-sourcing.

03

Legacy modernisation

Strangle legacy monoliths with well-tested API facades, migrating service by service.

04

High-throughput transactional systems

Financial-grade backends handling millions of operations daily at sub-100ms latency.

Why teams choose HIIS

Polyglot expertise

We choose the right language per problem: Scala for concurrency, Python for data, Node.js for I/O-heavy services.

Observability from day one

Every service we build ships with structured logging, distributed tracing, and SLO dashboards.

Battle-tested patterns

CQRS, event sourcing, saga pattern, circuit breakers: we apply proven distributed-systems patterns, not reinvent them.

Security by design

OAuth2, RBAC, secrets management, and automated vulnerability scanning are standard in every sprint.

See it in action

Live, interactive demos of what we actually build and operate.

kafka-consumer · order-service
Kafka
▶order.created{"id":"ord_982","total":149}P0
▶inventory.reserved{"sku":"SKU-42","qty":1}P1
3 consumers · lag 0ms● consuming
pg-explorer · hiis_prod
PostgreSQL

Columns

●id
●user_id
●total
●status
●created_at
EXPLAIN: 0.3ms · seq scan

Technologies we use

Backend

Scala

Concurrent, resilient systems with Scala and its functional toolkit.

Deep dive
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Frequently asked questions

We're polyglot: Scala (Akka, Play), Java (Spring Boot), Node.js (NestJS, Express), Python (FastAPI, Django), and Go. We select based on team context, throughput requirements, and existing stack.

Yes. We design API layers and event bridges that connect new services to legacy databases, ERP systems, and third-party APIs without disrupting existing operations.

We use expand-contract migrations with feature flags, so schema changes are backwards-compatible and deployable without downtime.

We start with an API contract (OpenAPI spec) agreed with all consumers before writing a line of implementation code. This prevents breaking changes and aligns teams.

Testimonials

Trusted across industries

From public institutions to crypto exchanges, teams choose HIIS to ship software that performs, and they say so.

  • AI
    “We carried decades of legacy systems. HIIS delivered secure, well-documented APIs and an AI document-classification pipeline in Python and Hugging Face that cut manual processing by 60%.”
    Claire MensahClaire MensahHead of Modernisation · National Records AgencyGovernment
  • “HIIS built our spot exchange, order book, wallets and KYC, to take real volume under load. We have run at sub-50ms order latency and 99.99% uptime since launch.”
    Marco RossiMarco RossiFounder & CEO · Vertex ExchangeFinance & Crypto
  • “Our headless storefront on Next.js loads in under a second and conversion is up 38%. HIIS sweated every Core Web Vital.”
    Isabelle MoreauIsabelle MoreauVP of Ecommerce · Lumière Retail GroupEcommerce
  • AI
    “HIIS built offline-first farm-management tools that sync the moment our growers get signal, plus TensorFlow yield-forecasting models, output up 22% and waste down 30%.”
    Aïcha TraoréAïcha TraoréChief Executive Officer · GreenField AgritechAgriculture
  • “HIIS delivered a HIPAA-compliant telehealth platform, secure video, scheduling and e-prescriptions, that our clinicians actually enjoy using. Wait times fell 45%.”
    Dr. Sarah ChenDr. Sarah ChenChief Medical Officer · Lumen HealthHealth
  • AI
    “The mobile banking app HIIS shipped in Flutter feels instant, and their real-time AI fraud-scoring models caught threats we were missing, dropping fraud losses by 40%.”
    David OkekeDavid OkekeHead of Digital Banking · Meridian Retail BankBanking
  • AI
    “HIIS built a multilingual semantic search engine across 20+ African languages using RAG, OpenAI and a vector pipeline, sub-300ms over 100M+ documents.”
    Olivier NkurunzizaOlivier NkurunzizaFounder · Sahara AISearch
  • AI
    “The AI recommendation engine HIIS built lifted our average order value noticeably, personalised discovery that genuinely converts.”
    Mei LinMei LinChief Digital Officer · StyleNestEcommerce
  • “Our core payments engine, re-engineered by HIIS in Scala and Kafka, clears five million transactions a day at sub-100ms latency. It has stayed rock-solid through every peak.”
    Sophie LaurentSophie LaurentChief Technology Officer · Atlas Commercial BankBanking

Other services

Web Development
Mobile Development
Custom Software

Have a project in mind?

Tell us about it, we'll get back to you within 48 hours.

Talk to an expertSee our work