Pennsylvania · Winner of 2022 Philadelphia 100 Fastest Growing Company Award
Web development
company in Pennsylvania,
and beyond.
OpenSource Technologies (OST) is the web development company Philadelphia organizations turn to for powerful web solutions. From corporate portals to complex web platforms, our work is guided by client vision, user behavior, and data-driven strategies. Award-winning team based in Lansdale, with a second US office in Atlanta, Georgia.
- 14+ years in business
- 500+ apps delivered
- $10B+ eComm processed
- WCAG 2.2 AA
- Section 508
Free · Same-day response
Tell us what you're building
A senior engineer replies within one business day — no call center, no gatekeeping.
Trusted by Pennsylvania & national organizations
What we do
Everything a Pennsylvania build needs, under one roof.
Six core services delivered by senior engineers — the same team from discovery through launch and long-term support. No hand-offs to a junior bench.
Custom Mobile App Development
Tailor-made mobile and web applications that match your business goals. iOS, Android, and cross-platform builds with intuitive UI/UX, robust functionality, and consistent performance.
Explore →Custom Web Development
Scalable, secure, high-performance web platforms tailored to your business. Enterprise portals, e-commerce systems, and SaaS applications using modern technologies.
Explore →AI Consulting And Implementation
Predictive analytics, intelligent chatbots, recommendation engines, and AI integrations across custom and hybrid mobile apps. Knowledge-base-grounded assistants that work in production.
Explore →Systems Integration
Enterprise systems integration, AI-powered integration solutions, data integration. Connecting CRMs, ERPs, payment processors, and custom platforms.
Explore →Maintenance
Application maintenance services. Security patches, dependency upgrades, bug fixes, and performance tuning so your team stays focused on new features.
Explore →API Development
Secure, scalable, high-performance APIs for smooth communication between applications. RESTful, GraphQL, and third-party API integration designed to scale.
Explore →
Also delivered:DevOps ConsultingQuality AssuranceSoftware SecurityMigration & UpgradesDigital Marketing
Portfolio
Real Pennsylvania & national builds.
A selection from 25+ shipped case studies — education, nonprofit, consumer brands, e-commerce, and more. Every one is a named, referenceable client.
KIPP Public SchoolsView case study →
WesleyanView case study →
The University of Hong KongView case study →
Bread For The World$100K+ saved in annual content productionView case study →
KDDView case study →
Silver MirrorView case study →
SteamWorxView case study →
Wildboaratvparts+30% sales · $100K+ savedView case study →
On camera
Real names. Real outcomes. On the record.
Not stock quotes — actual OST clients on video. These are the same testimonials that run on our homepage.
Compliance and PA procurement
Built for state and local RFPs.
Pennsylvania state, county, and municipal procurement teams require defensible compliance posture. Our work meets the conformance standards typically asked for in PA SLED bids.
- Accessibility default:WCAG 2.2 AA + Section 508 conformance on every build, included in baseline scope, not as an add-on. Audit-ready documentation produced as part of the engagement.
- Open Records aware:Familiar with Pennsylvania Right-to-Know Law and the typical records-request workflows our state and municipal clients have to honor.
- SAM-registered:Active System for Award Management registration. UEI, NAICS codes, and CAGE code available on request to qualified procurement officers.
- Past performance documentation:COI, key personnel resumes, and named past-performance references shareable under mutual NDA, typically within 2 business days of request.
- Section 508 audit reports:Senior leads include a WCAG 2.2 AA Accessibility Oversight credential. We deliver third-party audit-ready accessibility documentation as part of every engagement.
Procurement officers can reach out via the contact form below to receive the full procurement packet, including capability statement and reference contacts.
Pennsylvania-specific inquiries
Talk to a local partner.
Whether you are a PA-based business evaluating vendors, a school district preparing an RFP, or a procurement officer running a SLED bid evaluation, we respond within one business day.