Slingstone Systems

One small team. Your entire stack.

Microsoft 365 and cloud, identity and security, AI automation, integrations, custom software and mobile apps. The same senior people handle all of it, so nothing gets lost between vendors.

M365 & cloud Identity Security Automation & software
We ship production softwareOur own multi-tenant platform runs daily operations for paying customers.
13 years in real operationsWe've run the business side, not just the servers. We automate what actually hurts.
Infrastructure to app storeCloud, security, backend, web and mobile, under one roof.

Everything we can do, sorted by shelf

Type a tool, a problem or a word like "Outlook", "PDF" or "invoices" and see where it lives.

Microsoft 365 and cloud

Your core workplace, set up right and kept that way.

  • Tenant setup and cleanup
  • Exchange Online and Outlook
  • Mailbox migrations
  • Teams and SharePoint
  • OneDrive file migrations
  • Azure
  • License optimization
  • Backups and retention
  • S3 object storage

Identity and security

The right people get in. Everyone else doesn't.

  • Single sign-on (SSO)
  • Multi-factor authentication
  • Conditional access
  • Role-based permissions
  • Onboarding and offboarding
  • Audit trails
  • Security assessments
  • Email security: SPF, DKIM, DMARC
  • Hardening and patching

AI and document automation

Stop retyping what's already on paper.

  • OCR for PDFs and scans
  • AI data extraction
  • Structured outputs from LLMs
  • Document validation rules
  • Automatic PDF generation
  • Invoice and contract intake
  • AI chat assistants
  • 24/7 auto-responses

Integration and data

Your tools, finally talking to each other.

  • API integrations
  • GraphQL and REST
  • CRM and Airtable sync
  • Excel and CSV importers
  • Messy data cleanup
  • Deduplication
  • Invoice reconciliation
  • Payroll and settlement engines
  • Chat bots (Telegram and more)

Custom software

When off-the-shelf doesn't fit how you work.

  • Web platforms (React, TypeScript)
  • High-performance backends (Rust, Go)
  • PostgreSQL databases
  • Multi-tenant SaaS
  • Client portals
  • Internal dashboards
  • Case and workflow management
  • CRM builds

Mobile apps

For teams in the field, not at a desk.

  • iOS and Android (Flutter)
  • One app for many clients
  • Offline-friendly workflows
  • Photo and document capture
  • Push notifications
  • App Store and Google Play releases

DevOps and reliability

Things stay up, and when they don't, we know first.

  • Docker
  • Monitoring and alerting
  • Centralized logging
  • Custom monitoring tools
  • Deployment pipelines
  • Web hosting and domains
  • DNS management

Product and launch

Everything around the software that makes it land.

  • UX and UI design
  • Brand identity and logos
  • Landing pages
  • Sales decks
  • Terms of service and EULA setup
  • Clickwrap acceptance
  • English and Russian materials

Engineering lab

Yes, we also build physical things.

  • Parametric CAD
  • Functional 3D-printed parts
  • Engineering-grade materials
  • Rapid prototyping
  • Electronics prototyping
Not on a shelf yet? Ask anyway. If we can't do it well, we'll tell you who can. Send us the details.

What we take off your plate

Plan it, build it, secure it and keep it running. One accountable team instead of five vendors.

Managed Microsoft 365 and cloud

Setup, migrations and day-to-day support, documented and handed over clean.

Security and access

Assessments, MFA, SSO and access control, with a written plan for clients and insurers.

AI document automation

PDFs, scans and emails turned into clean data in your systems, checked before it lands.

Integrations and workflows

We connect the tools you already pay for and remove the copy-paste between them.

Custom platforms

CRMs, portals and operations systems built around how your business actually runs.

Mobile apps

Field apps for iOS and Android that your team will actually use.

Recent work

Different industries, the same problem: too many disconnected tools and too much manual work. Client names are kept private.

Freight carrier
Pilot build

Driver pay and settlement automation

Dispatch updates arrived as chat messages, and settlement invoices ran to hundreds of rows. We built a chat-message parser, an invoice importer, a pay engine that supports several pay policies, and automatic reconciliation of promised versus paid.

The reconciliation exposed a structural calculation error worth five figures a week.

Python, PostgreSQL, Telegram Bot API, Airtable sync

Immigration law firm
In development

One system instead of six

The firm ran on a CRM, a docketing tool, practice management software, a payment processor, file storage and Outlook, none of them connected. We mapped every workflow and designed a single CRM and case-management platform: six shared phases for every matter, with case-specific steps underneath.

Built to start with H-1B cases and expand to PERM, employment-based and family cases.

Workflow design, CRM architecture, data migration planning

Operations SaaS
In production

A multi-tenant platform we built and run ourselves

A full operations platform with isolated per-client instances, fine-grained permissions and audit trails. It includes AI document import, automatic PDF generation, in-app chat, and a single mobile app that connects each user to their own company's server.

Used daily by paying customers since early 2026.

Rust, GraphQL, React, TypeScript, PostgreSQL, Flutter, Docker

Document-heavy operations
In production

AI intake for business documents

Incoming PDFs and scans are read with OCR and extracted into structured fields, then checked with validation rules before anything touches the database. The system learns new document formats over time.

Hours of manual data entry turned into a review step.

OCR, LLM structured outputs, validation pipeline

Three ways to work with us

Start with one project or hand us the whole stack. Most clients begin with an assessment.

Project

For a defined outcome

A migration, a security overhaul, an integration or a custom build, scoped and priced up front.

  • Fixed scope and timeline
  • Full documentation at handover
  • Post-launch support included

Advisory

For teams with in-house IT

Senior guidance on architecture, security and vendor decisions, without a full-time hire.

  • Monthly strategy sessions
  • Vendor and license reviews
  • A roadmap you can act on

Small, precise, aimed

A slingstone is how the smaller side wins. You work directly with the people who build and run your systems, not a ticket queue.

Founder and managing member

13 years running real-world operations. Turns business pain into system design.

Lead full-stack engineer

Architecture, web platforms and mobile apps, from database to App Store.

Backend engineer

High-performance services, APIs, data models and integrations.

Product owner

Scope, priorities and delivery. Keeps every project on time and on target.

Client coordination and growth

Your day-to-day contact for onboarding, communication and follow-through.

Common questions

What size businesses do you work with?

Usually teams of 5 to 200 people who need reliable, secure systems but don't want to build a full internal IT department.

Do you only work in Illinois?

No. Most of our work is remote, so we support clients across the US.

Can you take over from our current IT provider?

Yes. We handle the transition, collect credentials and documentation, and make sure nothing falls through the cracks.

Do we have to replace our existing tools?

Rarely. We usually connect and automate what you already have, and only build new software where the gap is real.

What does the first call cover?

Thirty minutes on what's working, what isn't and what worries you. You'll leave with honest next steps whether or not we work together.

Tell us what's slowing you down

Send a few details and we'll get back to you to schedule a call.

Prefer to call? (773) 858-4602