Custom Web Application & Software Development
Production software engineered for robust business logic, high throughput, and scale
I engineer custom web applications and bespoke business software for companies that have outgrown disjointed spreadsheets and generic SaaS templates. Built on type-safe TypeScript, relational database foundations (PostgreSQL/Supabase), and resilient API integrations with clearly defined repository, infrastructure, and ownership terms agreed upfront.
When is this service the right fit?
Companies with complex operational logic that off-the-shelf software cannot accommodate
Founders and engineering leaders deploying client portals, custom calculators, and admin suites
Enterprises needing to unify data pipelines and internal business operations into custom software
Partners seeking an experienced Zagreb-based full-stack engineer to build and own core system architecture
Common pitfalls of generic approaches
Sluggish architectures and technical debt
Legacy software and bloated platforms that frustrate internal teams and make feature expansion risky.
Data silos across fragmented tools
Customer records, documents, and transaction histories trapped in separate disconnected databases.
Rigid constraints of generic platforms
Inability to implement proprietary business rules, custom role permissions, or deep webhook automations.
Why Custom Web Applications are the Modern Standard for Business Software
Modern web applications replace disconnected spreadsheets and brittle legacy desktop tools with a unified, browser-accessible relational system.
Unified Source of Truth:
Consolidate customer data, orders, and transactional workflows into an optimized PostgreSQL database with real-time state synchronization.
Granular Role-Based Access (RBAC):
Enforce strict viewing and editing permissions at the database level so employees, clients, and partners access only authorized records.
Unconstrained Business Logic:
Engineer bespoke formulas, complex data pipelines, and proprietary operational workflows impossible to configure in generic SaaS templates.
Clear IP & Repository Terms:
Repository access, licensing, and code handover terms are clearly defined in the project agreement, providing transparent control over your software.
What is engineered & deployed
Client & Customer Portals
Secure authentication, role-based access control (RBAC), self-service records, and contract vaults.
Operations Dashboards & Admin Suites
Real-time telemetry, queue management, bulk data processing, and custom reporting views.
Scalable API & Database Architecture
PostgreSQL schema design, Row-Level Security policies, and low-latency API endpoints.
Direct Engineering Partnership for Core System Architecture
Partnering directly with an experienced technical builder ensures that data models, business rules, and API integrations are shaped collaboratively with the person writing the code.
Direct Architect Communication
Discuss technical constraints and data schemas directly with the engineer responsible for system design.
Agile Decision Velocity
Direct collaboration allows requirements to be refined and implemented rapidly without intermediary communication layers.
End-to-End Code Cohesion
Consistent full-stack engineering standards from database normalization to production edge deployment.
Real-world production systems
VjenčajSe
Regional AI-first wedding planning platform and marketplace featuring MladenkaAi personal assistant, budget engine, and vendor discovery.
Pikni
Hospitality growth platform and direct online booking operating system helping restaurants and bars capture direct reservations, elevate Google reputation, and eliminate no-shows.
Harmony Plaza
Premium residential development (16 buildings, 288 apartments) powered by Programmatic SEO architecture, interactive unit finder, and integrated real estate CRM backend.
TAMC 2026
Complete e-commerce, registration, and CRM system powering The Aesthetic Medicine Congress 2026 at Hotel Valamar Lacroma in Dubrovnik, Croatia.
ZdravKo AI
Comprehensive brand identity, IoT smart vending hardware integration, and mobile AI nutrition assistant for corporate health and meal tracking.
Step-by-step engineering workflow
Domain Modeling & Entity Relations
Mapping data structures, permission tiers, and transaction workflows prior to code implementation.
UX Flow & Interface Design
Designing responsive, high-density interfaces focused on operator efficiency and clear user feedback.
Type-Safe Full-Stack Build
Developing backend logic and frontend modules in TypeScript with rigorous authorization guardrails.
Integration, QA & Edge Deployment
Connecting third-party webhooks, testing failure modes, and deploying to global edge infrastructure.
How we scope and structure project sprints
Scope: Auth, relational database, 1–2 primary business workflows, admin controls, responsive UI
Best for: Client portals, workflow automation tools, and spreadsheet replacement systems
Scope: Multi-tiered RBAC, complex third-party integrations, webhook automations, live dashboards
Best for: Full-scale operational software, multi-sided booking platforms, and custom business tooling
Frequently asked strategic questions
Whenever users require authenticated accounts, dynamic data entry, customized workflows, or when the system must interface directly with proprietary APIs and databases.
All source code, database migrations, and deployment configurations are committed directly to your GitHub organization. Code ownership and licensing terms are clearly specified in the project agreement.
Stack selection is tailored to the project's scalability needs, typically leveraging TypeScript, React, Next.js, TanStack Router, PostgreSQL, Supabase, Cloudflare, and Node.js.
Explore Other Specialized Services
Looking for an engineering partner for Custom Web Application & Software Development?
Reach out with a brief overview of your idea or current bottleneck. I respond within 24 hours with concrete feedback on architecture, scope, and timeline.