Tell us about your project
Websites, software, SEO, paid media, and design—built as one connected system.
The invisible engineering partner behind leading digital agencies, web design studios, and SaaS companies. Deliver custom web applications, APIs, mobile apps, and enterprise systems without the overhead of building an in-house development team.
When a high-value client asks for a custom portal, web platform, or mobile app, turning it down costs you revenue and client retention. Hiring full-time US engineers costs months and hundreds of thousands in payroll. ONYXTA gives you an elastic, senior engineering arm that executes under your brand.
You own the client relationship, the commercial contract, and the billing. We never interact with your client unless explicitly requested to attend technical scoping sessions as a member of your internal team.
Scale your technical offerings overnight. Sell custom web applications, multi-tenant SaaS tools, and complex mobile platforms to enterprise clients with complete confidence in delivery execution.
No freelance ghosting or unpredictable delays. You receive transparent weekly milestones, production-ready code, comprehensive documentation, and predictable fixed pricing on every engagement.
From early-stage MVPs to mission-critical business platforms, we build robust software that your clients will rely on for years.
Full-stack, multi-tenant SaaS products, customer portals, complex dashboards, and internal business tools tailored to your client's unique operations.
Robust REST & GraphQL APIs, third-party payment gateways, CRM integrations, ERP bridges, webhooks, and secure microservices architectures.
Cross-platform iOS and Android mobile experiences engineered with native performance, offline persistence, and seamless cloud syncing.
Scalable database schemas, cloud infrastructure, serverless functions, background workers, and automated deployment pipelines.
Headless e-commerce setups, custom checkout flows, inventory syncing, Shopify custom apps, and subscription payment engines.
SLA-backed bug fixes, framework updates, dependency patches, performance optimization, security monitoring, and post-launch feature releases.
Designed for speed, clarity, and zero friction. We integrate directly into your agency's delivery pipeline.
You bring us into the opportunity. We evaluate the technical requirements, architecture constraints, and outcomes with zero commitment required.
Within 48 hours, we deliver a comprehensive Statement of Work (SOW) with defined deliverables, milestone schedules, and fixed pricing—no hourly surprises.
Your dedicated development team builds the solution. You get access to private staging URLs, Git commits, and async weekly standups in your time zone.
We hand over clean, thoroughly tested, production-ready code with complete documentation and IP transfer. We can also handle ongoing support under your brand.
Traditional software development agencies are structured around direct retail clients. ONYXTA is architected specifically around the operational needs of agency partners.
We never treat agency work as a side gig. From NDAs to Git commits and communication protocols, our entire operating model is engineered to keep us completely invisible behind your brand.
We work Monday through Friday, 9 AM – 6 PM EST, ensuring real-time collaboration with teams across New York, Chicago, and California. No waiting 24 hours for a simple Slack response.
We never broker your project out to anonymous freelancers. The senior engineers introduced during your technical kickoff are the exact specialists who architect and write your code.
Clear, predictable project pricing based on agreed deliverables. No creeping retainers, hidden administrative fees, or unapproved budget overruns.
We execute mutual non-disclosure agreements before reviewing project files. You and your client retain complete, unrestricted ownership of all source code, assets, and databases.
Modern TypeScript, modular components, automated tests, scalable databases, and clean documentation your clients' internal technical teams will respect.
We partner with established agencies and consultancies that value craft, dependability, and professional accountability.
Win high-ticket retainers and productized offerings by delivering custom web applications, calculators, tracking engines, and interactive client tools without hiring full-time engineers.
Stop turning away projects when a client asks for user authentication, third-party database syncing, or bespoke backend logic. We build the engine behind your visual design.
Offload integration backlogs, mobile companion apps, MVP prototypes, and legacy refactoring to a dependable engineering partner while your core team stays focused on primary platform features.
Provide complete end-to-end transformation. Transform technical roadmaps and strategic specifications into production software delivered on time, within budget, and under your brand.
We choose proven, maintainable technologies that deliver fast load times, robust security, and straightforward long-term maintainability.
Most agency outsourcing fails for three reasons: communication barriers across conflicting time zones, subcontracting to anonymous junior developers, and code delivered with zero documentation that breaks under heavy traffic.
We do not cut corners. We would rather spend an extra afternoon perfecting an API schema or running automated integration tests than ship brittle software that threatens your agency's reputation with a valuable client.
When you partner with ONYXTA, you gain a dedicated, senior-level engineering arm that reflects your agency's standards, answers in your time zone, and executes with uncompromising precision.
Everything you need to know about partnering with ONYXTA as your invisible white-label engineering partner.
Have a custom inquiry? Let's talkNever. We operate as an invisible white-label engineering arm. All communication, deliverables, code repositories, and documentation flow exclusively through your team. Your client will only ever know and recognize your brand.
Yes, unconditionally on every project. We have a standard mutual NDA ready to execute before you share sensitive client briefs or proprietary technical documentation, or we are happy to review and sign your agency's standard NDA.
You and your client own 100% of all intellectual property, source code, designs, architecture, and deployment configurations immediately upon milestone completion and final settlement. We claim zero proprietary rights to any software we build for you.
Most custom development engagements begin around $5,000 for focused MVPs, key integrations, or specific project milestones. We work predominantly on fixed-scope, fixed-price contracts so both you and your client enjoy total budget clarity with no surprise hourly bills.
Once the Statement of Work (SOW) is signed and technical specifications are finalized, we typically onboard and initiate development within 5 to 10 business days. Expedited kickoff timelines can be evaluated for time-sensitive launches.
Because our white-label contracts are protected by strict confidentiality and non-disclosure agreements, we never publicly display client-branded code or white-label applications in our open portfolio. However, on an introductory technical consultation call, we can walk you through comparable architectural patterns, feature complexity, and code standards we've delivered.
We align our primary collaborative hours with standard US business time zones (Monday through Friday, 9:00 AM – 6:00 PM EST), providing direct synchronous overlap with clients and agency partners in both Eastern and Pacific regions.
Yes. We offer flexible post-launch SLA support agreements covering security patches, dependency updates, server monitoring, bug fixes, and secondary feature sprints—all delivered seamlessly behind your agency's support desk.
Tell us about your client's project or your upcoming technical pipeline. We'll evaluate the scope, confirm fit, and provide a transparent, fixed-price SOW within 48 hours.