Product Engineering & Custom Development

Ship Software With a Plan for Scale

Strategy needs execution. Fifth Nine works alongside your team to design, build, and ship software, with architecture, testing, and handoff planned as part of the scope.

What You Get

Full-Stack Web & Mobile Development

• React, Next.js, and TypeScript web applications
• React Native and cross-platform mobile development
• Progressive Web Apps with offline capabilities
• Server-side rendering and static generation for performance

MVP Design & Rapid Prototyping

• MVP scope and delivery milestones agreed before development
• User research-informed feature prioritization
• Lean development with fast iteration cycles
• Go-to-market technical readiness

API & Backend Architecture

• RESTful and GraphQL API design
• Microservices and event-driven architectures
• Database design and optimization (PostgreSQL, Redis)
• Third-party integrations and data pipelines

Frontend Engineering

• Design system creation and component libraries
• Accessible, responsive interfaces (WCAG 2.1 AA)
• Performance optimization (Core Web Vitals)
• Animation and interaction design

DevOps, CI/CD & Cloud Infrastructure

• AWS, GCP, and Azure deployment pipelines
• Infrastructure as Code (Terraform, Pulumi)
• Containerization with Docker and Kubernetes
• Monitoring, alerting, and observability

Code Audits & Technical Due Diligence

• Pre-investment technical assessments
• Architecture review and risk analysis
• Security vulnerability scanning
• Technical debt quantification and remediation roadmaps

Our Development Process

1. Scoping

Requirements, constraints, and architecture review during scoping. We define success metrics, map dependencies, and align on a delivery timeline before writing a single line of code.

2. Sprint 0

Environment setup, design system foundations, CI/CD pipeline, database schema, and authentication scaffolding. Everything needed to move fast without cutting corners.

3. Iterative Delivery

Delivery cycles and milestones agreed during scoping. Continuous deployment, automated testing, and regular stakeholder demos ensure alignment throughout.

4. Handoff or Retention

Complete knowledge transfer with documentation, architecture diagrams, and team training. Or transition to an ongoing retainer for continued development and support.

Why Choose Our Engineering Team?

Senior Engineers, Not Juniors

Fifth Nine brings 15+ years of technology experience to architecture and implementation. Staffing and responsibilities are agreed for each engagement.

Embedded, Not Outsourced

We integrate with your team’s tools, processes, and communication channels. Daily standups, shared Slack channels, and PR reviews mean we operate as an extension of your engineering org, not a black box vendor.

Built to Hand Off

Plan the handoff with your team. Agree on documentation, testing, repository access, and deployment ownership so you can maintain the software.

Full-Stack Capability

We can work from database design through application development and deployment. Responsibilities and dependencies are defined in the project scope.

Frequently Asked Questions

What technologies do you work with?

Our core stack is TypeScript, React, Next.js, Node.js, and PostgreSQL. We also work with Python, Go, AWS, GCP, and React Native. We choose technologies based on your requirements, not our preferences.

How do you price projects?

Pricing, delivery milestones, and change-request terms are defined in a proposal after scoping.

Can you work with our existing codebase?

Yes. Many engagements start with a code audit to assess the current state, followed by targeted improvements or feature development on top of existing code.

What’s the typical team size?

Team size and responsibilities depend on scope. Agree on a technical lead and communication plan before work begins.

How do you handle project management?

We agree on project tools, planning, check-ins, and demos with your team. The communication plan defines how progress and decisions are shared.

Do you sign NDAs?

Confidentiality and IP assignment terms are agreed before work begins.

Ready to Build?

Let’s discuss your product vision and how our engineering team can bring it to life.