Product Engineering
Cross-functional teams that design, build, and ship your core product alongside your team, not instead of it.
React & Next.js
Swift & Kotlin
Design systems
Product & Platform Engineering
Software systems for companies that would rather ship than meet.
Fathom Systems designs, builds, and operates the infrastructure, platforms, and internal tools mid-size companies run on — so your engineers spend their time on the product, not the plumbing.
Trusted by engineering teams at
- Corrigan Freight
- Vantable Health
- Northline Capital
- Ossoro Robotics
- Petrel Logistics
- Fenwick & Yew
What we do
Four ways we get pulled in
Most engagements start narrow — a migration, a rebuild, a system nobody wants to own — and grow once the first thing ships on time.
Cloud & Infrastructure
Migrations, cost audits, and platform rebuilds that hold up under real production load.
Data & AI Systems
Pipelines, warehouses, and applied ML that turn operational data into something your team actually uses.
Legacy Modernization
Untangling twenty-year-old cores without stopping the business that depends on them.
How we work
A process that survives contact with your codebase
The same four phases whether the engagement runs six weeks or two years.
01
Discover
Two weeks embedded with your team to map the system as it actually behaves, not as the org chart says it does.
02
Architect
A written plan with tradeoffs, sequencing, and a number attached to every recommendation.
03
Build
Weekly ship cadence, visible in your own repos and staging environment from day one.
04
Operate
On-call rotation, runbooks, and a handoff plan your team can actually maintain.
Selected work
Systems we've put into production
Logistics · Platform rebuild
Replacing an 11-year-old dispatch system without a single missed delivery
Corrigan Freight ran its entire dispatch operation on a system last touched in 2013. We rebuilt it underneath the live operation, cutting over region by region.
63%Faster dispatch cycle
$2.4MSaved in year one
Healthcare · Data platform
A HIPAA-compliant data warehouse built in one fiscal quarter
Vantable Health needed reporting their compliance team could trust. We stood up ingestion, warehousing, and access controls before the next audit cycle.
9 wksTo first dashboard
412KRecords migrated nightly
Manufacturing · Cloud migration
Cutting cloud spend without touching uptime
Ossoro Robotics was over-provisioned across three regions. We rearchitected the fleet and renegotiated reserved capacity without a single unplanned outage.
47.2%Lower monthly spend
99.97%Uptime maintained
About Fathom
A studio built around the work nobody wants left half-finished
Fathom Systems was founded in 2016 by engineers who kept getting called in after someone else's system had already gone sideways. We still work that way — embedded, accountable, and judged on what's running in production, not what's in the deck.
We stay small on purpose. Every engagement gets senior engineers, not a rotating bench.
38Engineers & architects
9Industries served
6.2 yrsAvg. client relationship
112Systems shipped to production
They rebuilt our dispatch core in four months and never once made us feel like a support ticket.
Marisol Adeyemi-Kwan
VP of Engineering, Corrigan Freight
Get in touch
Tell us what's breaking
Most engagements start with a two-week discovery sprint. Fill this out and we'll set up a call within two business days.
Direct
- Emailhello@fathomsystems.io
- Phone+1 (312) 847-1928
- Office118 Kinzie Loop, Suite 400
Chicago, IL 60654