We push back when we should
If a tactic won't work for your business, we'll tell you — even when it costs us scope. Honest scope beats expensive surprises.
Custom Software Solutions in St. Louis, Missouri
We've been working with City of St. Louis businesses long enough to know what St. Louis customers respond to and what they ignore. Our Custom Software work isn't generic — it's built around how the local economy actually buys.
What our Custom Software program covers in St. Louis
When the SaaS stack runs out — when you need a workflow nobody sells, or two systems that don't speak to each other, or a customer-facing app — we build it. Modern stack (TypeScript, React, Postgres, AWS/Cloudflare), clean ownership terms (you get the code), and engagement scoped in two-week iterations so you can stop or pivot at any time.
- Internal tool and admin-panel builds
- Customer-facing web and mobile applications
- API and webhook integrations between SaaS systems
- Custom Shopify, BigCommerce, and WooCommerce extensions
- AI-feature integration (chat, search, summarization)
- Code ownership transfer and handoff to in-house teams
Why St. Louis businesses pick Relevant Domain
Outcome-based reporting, not vanity metrics
Every monthly report ties our work back to leads, bookings, or revenue — not just impressions and rankings.
Two-week iterations, not 12-month commits
Engagements are scoped in two-week sprints with clear deliverables. You can pause or pivot without breaking a contract.
Modern stack, no legacy debt
GA4, server-side tracking, modern CMSs, current ad APIs. We're not still running an agency on tools from 2017.
St. Louis market context
St. Louis sits at the confluence of the Mississippi and Missouri rivers and anchors the Midwest's heartland economy — Anheuser-Busch, Edward Jones, Centene, Express Scripts, plus a growing biotech corridor (BJC HealthCare, Washington University). A city with deep neighborhoods and a strong sports-and-civic identity around the Cardinals and Blues.
St. Louis-area industries we have direct experience with:
- Healthcare and biotech (BJC, Centene, Express Scripts)
- Financial services (Edward Jones, Stifel)
- Brewing and food (Anheuser-Busch)
- Aerospace and defense (Boeing)
- Higher education (Washington University)
Surrounding markets
Our Custom Software clients aren't just inside St. Louis city limits — we work across City of St. Louis and the broader Missouri market.
Nearby Custom Software clients we serve:
Frequently asked questions about Custom Software in St. Louis
What about ongoing maintenance after launch?
We offer monthly support retainers for hosting, updates, and small features — or we can train your in-house team to take over. Both paths are fine; we don't lock you in.
Do you do AI features?
Yes — RAG search, document summarization, customer-support chat, and proprietary-data fine-tuning when it actually moves the needle. We're skeptical of AI-for-AI's-sake projects.
When should a St. Louis business build vs. buy?
Buy first. Build only when (a) the workflow is core to your business and not generic, (b) the SaaS market doesn't have a real fit, or (c) the integration layer between SaaS tools is itself becoming a product. We'll talk you out of building if it's not the right call.
Will the software integrate with our existing systems?
That's usually the whole point. We build integrations to your CRM, ERP, POS, billing, and warehouse via documented APIs and webhook patterns.
Do you work with businesses in St. Louis specifically, or just remotely?
Both. We're headquartered in the Elkhart, Indiana area and serve businesses across the Midwest and Great Lakes — including St. Louis and the broader City of St. Louis / Missouri market. For St. Louis-area clients we'll come on-site for kickoff and quarterly reviews when it makes sense; day-to-day work happens over video and Slack like any modern agency.