Senior Full Stack Software Developer

The Role Own the entire product development process from day one. Architect, design, code, test, and deploy a production-grade SaaS platform on an aggressive timeline. You'll work directly with leadership, have full autonomy on technical decisions, and full accountability for results. This is a ground-floor opportunity to be the technical backbone of a product built to scale. What You'll Do

• Own the full development lifecycle: architecture, design, development, testing, deployment, and iteration
• Design and build multi-tenant SaaS architecture with isolated data across multiple organizations
• Build modular platform structure (project management, financials, document control, field ops, reporting) that scales independently
• Develop data-rich front-end interfaces (React, Vue, or equivalent) including dashboards, Gantt charts, cost code views, and real-time collaboration tools
• Build robust back-end systems (Node.js, Python, or similar) with RESTful/GraphQL APIs and automated business logic workflows
• Design relational database schemas (PostgreSQL/MySQL) for complex construction data: projects, budgets, cost codes, change orders, contracts, lien waivers, daily logs
• Implement role-based access control (RBAC) with multi-level permissions across user types
• Build document management with version control, cloud storage (AWS S3), full-text search, and large file handling (100+ MB)
• Set up cloud infrastructure (AWS/Azure/GCP): auto-scaling, load balancing, Docker/Kubernetes, CI/CD pipelines
• Build third-party integrations (QuickBooks, Sage, DocuSign, scheduling/ERP systems)
• Develop mobile functionality via React Native, Flutter, or PWA with offline capability

• 5+ years professional software development experience

• Proven track record taking a product from concept to live production deployment

• Experience with multi-tenant SaaS or enterprise platform architecture

• Strong full-stack skills: modern front-end frameworks, server-side languages, relational databases

• Deep system design and architecture understanding

• Cloud platform experience (AWS/Azure/GCP) including DevOps, CI/CD, and containerization

• Strong security fundamentals: OAuth 2.0, JWT, RBAC implementation

• Experience with API development, third-party integrations, and data conflict resolution

• Ability to work independently and communicate clearly to non-technical leadership

• Bias toward action - ship and iterate over endless planning Nice to Have

• Construction tech, project management platforms, or B2B SaaS experience

• Mobile development (React Native, Flutter)

• Startup or small-team environment background

• Accounting system integrations (QuickBooks, Sage)

• Real-time dashboards or BI features

• Knowledge of construction workflows and field operations

401(k) Bonus based on performance Competitive salary Health insurance Opportunity for advancement Paid time off Profit sharing, + Competitive compensation with potential equity/profit-sharing

• Fast-paced environment that values results over process

About ApexOS360 ApexOS360 is building an enterprise-grade operating platform for construction companies - project management, financials, field operations, document control, and real-time reporting in one system. Think Procore-level capability, built by people with 27+ years actually running construction projects across Texas and Colorado.