CrossX

Software engineering · Staff augmentation

Senior engineers, crossed into your roadmap.

CrossX builds custom software and embeds senior engineers directly in your team — backend, frontend, mobile, data and ML, DevOps, QA. Bring us the problem. We bring people who have solved it before.

Tell us what you're solving See how augmentation works
  • Based in Connecticut, USA
  • Working hours aligned with US teams
  • Senior engineers only
Senior-onlyNo junior engineers learning on your codebase. Every person we put on your work is senior.
Weeks, not monthsBuilt to get engineers into your standups far faster than a full-time hiring cycle.
Your tools, your ritualsWe work in your repos, your tracker and your ceremonies — not a parallel process.
One accountable leadA single CrossX contact who owns the engagement, from first call through every check-in.

What we do

Two ways to add engineering horsepower.

Hand us an outcome and we'll deliver it end to end, or add senior engineers to the team you already have. Most clients use both at different moments.

01

Custom software engineering

Web platforms, mobile apps, APIs and internal tools — designed, built and shipped to production by a senior team.

Explore Custom software engineering 02

Staff augmentation

Senior engineers who join your team, adopt your workflow and start contributing in the first sprint.

Explore Staff augmentation 03

AI/ML engineering

LLM features, retrieval, ML pipelines and model integration that hold up in production, not just in a demo.

Explore AI/ML engineering 04

Modernization & cloud

Incremental rewrites, cloud migrations and the unglamorous work of making old systems safe to change.

Explore Modernization & cloud 05

QA automation & DevOps

Test automation, CI/CD and platform engineering so your team can release often without fear.

Explore QA automation & DevOps 06

Fractional CTO

Senior technical leadership for architecture calls, hiring plans and roadmaps — without a full-time executive hire.

Explore Fractional CTO

Engagement models

Choose how we work together.

Three ways to engage, depending on who owns the backlog and how much of the delivery you want us to carry. You can move between them as your needs change.

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Compare engagement models in detail

Start with the problem

What are you trying to solve?

Pick the closest fit. We'll point you to the most useful first conversation — not a pre-packaged offer.

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The senior-only principle

The people who scope the work are the people who do the work.

No bait-and-switch between the sales call and the first commit. Senior engineers make better calls with less supervision, write code your team can maintain, and leave your people stronger than they found them.

Why we only staff senior engineers

  1. Less ramp-up

    Senior engineers read an unfamiliar codebase quickly and ask the right questions early.

  2. Fewer rewrites

    Good architecture decisions up front cost far less than corrections later.

  3. Knowledge that stays

    We document, pair and review so capability remains with your team.

Ready when you are

Bring us the problem — not a predetermined solution.

A short call is usually enough to tell whether we're the right fit. If we're not, we'll say so.

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