Software Development Services

Comprehensive software development services tailored to your business needs.

Website & Mobile App Development for SaaS

Responsive websites and cross-platform mobile apps with full-stack design, accessible UX, and backend architecture built to scale.

Custom responsive web applications
Cross-platform mobile development
Progressive Web Apps (PWA)
UI/UX design and prototyping
Performance optimization
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Fast & Secure Web Hosting & Maintenance

Lightning-fast hosting with hardened security and seamless performance, monitored 24/7.

High-performance server infrastructure
SSL certificates and security hardening
Automated backups and disaster recovery
CDN integration for global performance
24/7 monitoring with automated alerting
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Software Product Development & Consulting

End-to-end product development from concept to launch using agile methodologies and modern technologies tailored to your business needs.

Product strategy and roadmap planning
MVP development and iteration
Agile development methodology
Scalable architecture design
Continuous integration and deployment
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Enterprise System Integration Services

Connect your systems, automate workflows, and eliminate data silos with integrations across departments, applications, and data sources.

API design and development
Third-party system integration
Data migration and synchronization
Workflow automation
Legacy system modernization
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Cloud Infrastructure & Solutions for SaaS

Scalable, reliable cloud infrastructure with high availability, fast load times, and cost-efficient management as your business grows.

Cloud architecture and migration
Auto-scaling and load balancing
Container orchestration (Docker, K8s)
Infrastructure as Code (IaC)
Cost optimization and monitoring
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Data Security & Compliance for Custom Software

Enterprise-grade security with encryption, multi-factor authentication, threat detection, continuous monitoring, and disaster recovery.

Security audits and assessments
Encryption and data protection
Multi-factor authentication
Compliance preparation support (GDPR, SOC 2, HIPAA)
Incident response planning
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Dedicated Senior Developers for Your Team

HighAppler places 1 to 3 senior developers inside your engineering team. They join your standups, tools and code reviews and work Monday to Friday, 10:00-19:00 Bulgarian time (03:00-12:00 US Eastern).

1 to 3 senior developers matched to your stack
Work in your repositories, tools and processes
Daily standups and code reviews with your team
Knowledge sharing with your engineers
Performance tracking and regular reporting
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Custom Software Development for EU-Funded Projects

Built against your grant budget line: a fixed price, a delivery date tied to the project end date, and the offer, protocol and invoice for your file.

Technical description and cost estimate before submission
Formal offer against the budget line
Development and testing by our own team
Acceptance protocol and invoice for the project file
Training, documentation and source code handover
Support and hosting after handover, priced separately
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Compare Engagement Models

Find the right fit for your project needs and budget.

FeatureFull TeamDedicated DevelopersDedicated QA
Team Size4 to 6 members1 to 3 senior developers1 or 2 QA engineers
Roles IncludedSenior tech lead, backend, frontend and QASenior developersManual & Automation QA
Best ForNew product developmentTeam augmentationQuality assurance
ScalingFull team adjustmentsAdd/remove individual devsAdd/remove QA resources
Pricing ModelFixed price or time and materialsFixed price or time and materialsFixed price or time and materials

Senior engineers are billed at $25-$49 per hour, and projects start at $1,000.