Services

From a hard problem to software in production.

Five capabilities, one standard: senior engineers who own the outcome. Engage us for a defined project, a dedicated team, or individual engineers embedded in your own.

  • Web, mobile & platform
  • AI/ML in production
  • Modernization & cloud
  • Quality & delivery
  • Technical leadership

What we deliver

Capabilities, not packages.

We don't sell fixed bundles. Tell us what has to be true at the end, and we'll shape the team and the plan around it.

01Core

Custom software engineering

Production software built around how your business actually works — customer-facing products, internal platforms and the APIs that connect them. We take features from rough idea to shipped, tested and observable, and we write code your own engineers will be glad to inherit.

  • New products and major features, end to end
  • Web applications, mobile apps and public APIs
  • Internal tools and workflow automation
  • Integrations with the systems you already run
  • Web platforms
  • iOS & Android
  • APIs & integrations
  • Internal tools
02Modern capability

AI/ML engineering & integration

AI features are software features: they need data pipelines, evaluation, guardrails, monitoring and a sensible cost model. We help you pick problems where AI genuinely earns its place, then build them so they keep working after the demo.

  • LLM-powered features with retrieval over your own data
  • Evaluation harnesses so quality is measured, not assumed
  • ML pipelines from data preparation to deployment
  • Embedding AI into existing products and workflows
  • LLM integration
  • Retrieval (RAG)
  • Evaluation & guardrails
  • ML pipelines
  • MLOps
03Reduce risk

Legacy modernization & cloud

Most valuable software is old software. We modernize incrementally — strangling the risky parts, adding tests around what works, and moving workloads to the cloud when it makes economic sense — so the business never has to stop for a big-bang rewrite.

  • Incremental re-architecture of monoliths
  • Cloud migration and right-sizing
  • Framework, language and runtime upgrades
  • Test coverage around untested critical paths
  • Re-architecture
  • Cloud migration
  • Upgrades
  • Cost & reliability
04Ship with confidence

QA automation & DevOps / platform

Release speed is a quality problem. We build the automated tests, pipelines and infrastructure-as-code that let your team ship small changes often and roll back calmly when something goes wrong.

  • Test automation strategy and implementation
  • CI/CD pipelines and release automation
  • Infrastructure as code and environments on demand
  • Observability, alerting and incident readiness
  • Test automation
  • CI/CD
  • Infrastructure as code
  • Observability
  • SRE practices
05Leadership

Fractional CTO & technical leadership

Sometimes the gap isn't hands on keyboards — it's senior judgment. A CrossX technical leader can own architecture decisions, shape a hiring plan, run technical due diligence on your own systems, or steady a team through a critical delivery while you find the right permanent leader.

  • Architecture and build-versus-buy decisions
  • Engineering roadmap and hiring plan
  • Technical health assessments
  • Interim engineering leadership
  • Architecture
  • Roadmapping
  • Team design
  • Interim leadership

Technology

Fluent in the stack you already run.

We adapt to your languages, frameworks and cloud rather than steering you toward ours. Filter by area to see where our engineers work most often.

Languages 10

  • TypeScript
  • JavaScript
  • Python
  • Java
  • Kotlin
  • C#
  • Go
  • Rust
  • Swift
  • SQL

Frontend 7

  • React
  • Next.js
  • Vue
  • Angular
  • Svelte
  • HTML & CSS
  • Design systems

Backend 9

  • Node.js
  • .NET
  • Spring Boot
  • Django
  • FastAPI
  • GraphQL
  • PostgreSQL
  • Redis
  • Kafka

Mobile 4

  • React Native
  • Flutter
  • SwiftUI
  • Jetpack Compose

Data & AI 9

  • LLM applications
  • Retrieval (RAG)
  • PyTorch
  • scikit-learn
  • MLOps
  • Apache Spark
  • dbt
  • Airflow
  • Vector databases

Cloud & DevOps 8

  • AWS
  • Azure
  • Google Cloud
  • Kubernetes
  • Docker
  • Terraform
  • GitHub Actions
  • Observability

QA 7

  • Playwright
  • Cypress
  • Selenium
  • Jest & Vitest
  • pytest
  • API testing
  • Performance testing

Your starting point

Not sure which capability you need? That's normal.

Describe the problem and the constraints. We'll recommend the smallest engagement that actually solves it.