Full-stack
engineering services.
Architecture, development, deployment, and operations — delivered by a single accountable engineer across every layer of your stack.
What we build
Custom Web Applications
Full-stack platforms engineered from scratch. Customer portals, admin dashboards, booking systems, member sites, and multi-tenant SaaS products — architected for reliability.
Website Design & Development
Professional marketing sites, landing pages, and multi-page corporate websites. Accessible, performant, search-optimized, and engineered to convert.
E-Commerce Stores
Custom storefronts with integrated payment processing, inventory tracking, order management, and analytics. Subscription billing and recurring revenue supported.
Business Automation
Replace manual operations with reliable software. CRM integrations, email sequences, data pipelines, scheduled reporting, and custom workflow engines.
API Development & Integrations
New APIs or connections to existing systems. Payment gateways, third-party services, data feeds, mobile backends — secure by default and fully documented.
Database Architecture
Schema design, migration planning, query optimization, and ongoing management. Structure your data for reliability, integrity, and speed.
Security & Performance
SSL configuration, vulnerability assessments, OWASP reviews, performance profiling, CDN deployment. We harden what you’ve built and make it measurably faster.
Managed Hosting & Operations
Monthly retainers covering development, monitoring, backups, patches, and priority support. An engineer on call for your business without the cost of hiring in-house.
Mobile-First Redesigns
Rebuild outdated or broken sites with modern responsive architecture. We audit, restructure, and ship a site that works on every screen size.
Cybersecurity
Security assessments, vulnerability scanning, and secure code review for the software and systems you run. We harden servers, cloud environments, and accounts, help you respond when something goes wrong, and prepare your business for NIST SP 800-171 and CMMC requirements.
Software Testing & QA
Full-stack testing from test plan to release. Unit, integration, end-to-end, regression, and load and performance testing, plus accessibility testing against WCAG and Section 508. We also provide independent verification of software built by other vendors.
Mobile Apps
iOS, Android, and cross-platform apps, built around what your project needs.
AI & Automation
AI features and assistants built into your business software, with workflow automation and integrations that connect them to the systems you already use. Practical additions to real tools, scoped and priced up front like every other engagement.
DevOps & Cloud
CI/CD pipelines, deployment automation, and cloud and server setup, with monitoring in place so you know how your systems are running. Releases become repeatable instead of a manual checklist.
IT Consulting & Support
Technology planning, modernization of legacy systems, and ongoing support from the engineer who knows your setup. Talk through the problem with us before committing to a build.
Deployment & ongoing operations.
Keep your application fast, secure, and online. Three managed-operations tiers — upgrade at any time as your needs change.
- VPS hosting (shared server)
- SSL certificate, server firewall and intrusion blocking
- Daily backups, stored off the server
- 99.5% monthly uptime target, with automated uptime checks and alerts
- Server operating-system security updates
- Fixes and changes: billed at our hourly rates, or included on Managed
- Email support. Replies within one business day; urgent issues on sites we host answered within 1 hour, any time
- Dedicated VPS resources
- SSL certificate, server firewall and intrusion blocking
- Daily backups, stored off the server, with restore
- 99.5% monthly uptime target, with automated uptime checks and alerts
- Monthly updates to your site’s software (tested before release), plus security patches
- Up to 2 hours a month of fixes and small changes
- Email support. Replies within one business day; urgent issues answered within 1 hour, any time
- Dedicated VPS (premium tier)
- SSL certificate, server firewall and intrusion blocking
- Daily backups, stored off the server, with restore
- 99.5% monthly uptime target, with automated uptime checks and alerts
- Monthly updates to your site’s software (tested before release), plus security patches and performance tuning
- Up to 5 hours a month of fixes, small changes and ongoing development
- Email support. Replies within one business day; urgent issues answered within 1 hour, any time
All plans include initial domain and DNS setup. Pay yearly and get two months free: $490, $1,490 or $2,990 a year. Included hours are per month and do not carry over. Custom plans for larger sites or several sites.
Common questions.
The questions we field most often from clients evaluating an engagement.
How do you price projects?
Every engagement begins with a written scope and a fixed-price quote. There are no hourly billing surprises and no scope-creep upcharges. If you need a change after the contract is signed, you receive a written change order with its own fixed price — you decide whether to accept it before any additional work happens.
Do I own the source code when the project is delivered?
Yes. Full source-code ownership transfers to you on delivery and final payment. You receive the complete repository, deployment scripts, infrastructure configuration, and documentation. Nothing is gated behind a proprietary platform you can’t leave.
How long does a typical custom build take?
Most projects fall into one of three brackets: a small marketing site or landing application is roughly 1–3 weeks; a mid-sized web application or e-commerce store is roughly 4–8 weeks; a complex multi-tenant platform or operations system is 8–16+ weeks. The written proposal you receive after our discovery call includes a milestone-by-milestone timeline.
Where is DPM Enterprise based and who will I be working with?
DPM Enterprise LLC is an independent software engineering firm based in Quincy, Illinois, founded in 2026 by Derek Deppermann. You work directly with the engineer building your software — there are no account managers, no project-management middlemen, and no offshore subcontractors. We serve clients across the United States.
Do you subcontract work to other agencies or offshore teams?
No. Every line of code we deliver is written in-house. This is a deliberate constraint — it’s the only way we can stand behind the architecture, accountability and security of what we deliver.
Do you offer ongoing maintenance and support after launch?
Yes. Three monthly plans are available. Starter is $49 a month for hosting, SSL and daily backups. Managed is $149 a month and adds monthly software updates and up to 2 hours of fixes. Full Management is $299 a month and includes up to 5 hours a month of fixes and development. All three have a 99.5% monthly uptime target, and urgent issues on sites we host are answered within 1 hour, any time. Hours do not carry over. See the pricing section above for the full breakdown.
What technologies do you build with?
We architect each project around what fits the requirements rather than forcing a single stack. Common choices include Node.js / Express, React, Next.js, PostgreSQL, Supabase, Stripe, and Nginx, deployed on managed VPS infrastructure. For desktop, scientific, and systems code, we work in C++. We avoid lock-in to proprietary platforms and choose technologies you or another engineer can maintain long-term.
How do we get started?
Send us a short description of what you need to build through the contact form or call us at (309) 200-5279. We respond within one business day with either a written proposal or a request for a brief discovery call — whichever fits the project. There’s no commitment until you countersign the proposal.
Not Sure Which Service You Need?
Describe your situation — we’ll recommend the right scope, architecture, and engagement model. No commitment, no sales pressure.