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Design and development of fault-tolerant Highload systems, SaaS platforms and SPA

We create fast and scalable digital products with non-standard architecture: from quick MVP launch for startups to high-load SaaS services for regular subscriptions, Single Page Applications (SPA), Progressive Web Apps (PWA) and distributed microservices platforms.

Highload Architecture SaaS Platform Engineering Single Page Apps (SPA) Progressive Web Apps (PWA) Rapid Startup MVP Microservices & gRPC SAP Integration & Support
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100k+ RPS

Throughput capacity

Architecture is designed for parallel processing of tens of thousands of simultaneous requests without failures.

<50 ms Latency

Review time API

Asynchronous event queue, optimized indexes, and in-memory caching layer in Redis

4–6 Weeks

Speed of MVP release

Rapid market entry for the working prototype for testing hypotheses and attracting investments

100% Scalability

Horizontal scaling

Containerization of microservices for smooth auto-scaling during popularity spikes of the service.

[ ENGINEERING STANDARD HIGHLOAD ]

How to build digital products that maintain lightning-fast speed with millions of users

When a monolithic application encounters rapid audience growth, any complex analytical query may block database tables and cause service failure. For modern web applications, SaaS, and startups, a different engineering foundation is needed: clear division of responsibility zones, message brokers (RabbitMQ), dedicated microservices, and data caching in memory. We design digital systems so that they easily withstand exponential load growth without rewriting code from scratch.

✓ We sign an official contract with fixed price and development terms
✓ Warranty SLA support 90 days after the system is put into operation
✓ 100% transfer of intellectual property and source code of the project to the client

Asynchronous event architecture (EDA)

Heavy tasks (billing, report generation, mailing, analytics) are delegated to background workers in sequence

Replication and database sharding

Distribution of read (Read Replicas) and write (Master) operations, table partitioning for instant selections.

High-productive gRPC and WebSockets

Real-time two-way data exchange with no delays and low overhead costs for traffic transmission.

Seamless migrations without service interruption

Database versioning architecture and API allow updating the service unnoticed for active users.

[ 8 Categories of Solutions ]

Specialized Solution Areas

Choose the technical implementation format for your tasks.

[ 01 ] Instant App-Like Web

Development of Single Page Applications (SPA) ↗

High-speed web applications with instant screen switching without page reload in the browser. Ideal for complex interactive cabinets, financial panels and dashboards.

What is included in the implementation:
✓ Interface with reactive data updates in real time
✓ Clean REST/JSON or GraphQL backend on PHP 8.3 with high execution speed
✓ Client routing and optimized bundling for fast startup
✓ Smooth animations between sections and stable 60 FPS
Vanilla JS Modules / Vue / React / REST API / WebSockets
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[ 02 ] Offline & Installable Web

Development of Progressive Web Apps (PWA) ↗

Hybrid web applications, which are installed on a smartphone or computer with one click directly from the browser. Work offline and support sending Push notifications.

What is included in the implementation:
✓ Installation on Android, iOS, Windows desktops without App Store/Google Play commissions
✓ Full operation without internet connection through Service Workers and caching
✓ Sending push notifications to users to encourage repeat orders
✓ Cost savings of up to 70% budget compared to creating two native applications
Service Workers / Web App Manifest / Cache API / Push Notifications
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[ 03 ] Subscription Cloud Business

Development of SaaS platforms and subscription services ↗

Creation of software products under the subscription model (Software as a Service): multi-tenant architecture, automatic recurring billing, tariffs and personal cabinets.

What is included in the implementation:
✓ Multi-Tenant architecture with full data isolation for individual clients
✓ Automatic billing for regular subscriptions (Stripe Billing, WayForPay, Fondy)
✓ Flexible pricing model, free trial (Free Trial), and promo codes
✓ Administrative panel for monitoring MRR, Churn Rate, LTV and analytics
Multi-Tenant Architecture / Stripe Billing / JWT Auth / Webhooks
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[ 04 ] Rapid Launch & Validation

Development of MVP for startups and hypothesis testing ↗

Fast creation of a minimally viable product (Minimum Viable Product) within 4–6 weeks. Allows testing market demand, collecting first payments and attracting investors.

What is included in the implementation:
✓ Focus exclusively on the core value proposition of the product without secondary features
✓ Fixed budget and strict market launch deadlines under contract
✓ End-to-end conversion analytics and behavior analysis of the first real users
✓ Architectural allocation for seamless scaling after successful testing
Lean Engineering / Rapid Prototyping / Analytics Core / Agile
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[ 05 ] Enterprise SAP Connect

Integration and support for SAP systems ↗

Designing and developing secure connectors for data exchange between corporate systems SAP (ERP, S/4HANA) and external web services, portals and applications.

What is included in the implementation:
✓ Integration of SAP through RFC, BAPI, IDoc and modern REST/OData services
✓ Synchronization of product catalogs, group orders, and payment status in real time
✓ Protected data exchange gateways using SSL/TLS protocols and token encryption
✓ Technical support and monitoring of the stability of message queues
SAP S/4HANA / OData / RFC Connectors / BAPI / REST Gateway
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[ 06 ] Decoupled Scalability

Design of microservices architecture ↗

Decomposing bulky monolithic applications into independent compact microservices. Allows parallel development of different modules and scaling only loaded nodes.

What is included in the implementation:
✓ Design of service boundaries (Bounded Contexts) according to the Domain-Driven Design (DDD) methodology
✓ Organization of inter-service communication through message brokers RabbitMQ and Kafka
✓ API Gateway for centralized routing, authentication, and request limiting
✓ Containerization in Docker and lightweight orchestration in Kubernetes
Microservices / gRPC / RabbitMQ / Docker / API Gateway
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[ 07 ] Extreme Performance

Development of high-load Highload systems ↗

Creation of platforms designed for millions of daily views and massive user influxes during sales. Deep query optimization and caching.

What is included in the implementation:
✓ Code profiling and elimination of bottlenecks in script execution
✓ MySQL/PostgreSQL database tuning: composite indexes, partitioning, buffer optimization
✓ Multi-level caching: object cache Redis, memory OPcache, static cache
✓ Stress testing with load (JMeter, Locust) before deployment to production
Highload Tuning / Redis Cluster / MySQL Sharding / Stress Testing
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[ 08 ] Operational Efficiency

Internal corporate tools (Internal Tools) ↗

Creation of specialized web tools for the operations team: analytical dashboards, moderation panels, commercial proposal generators and cost calculators.

What is included in the implementation:
✓ User-friendly administrative offices for technical support and operators
✓ Fast interfaces for bulk editing and filtering of large volumes of data
✓ Automatic import/export of reports in Excel, CSV, PDF format in 1 clicks
✓ Strict logging of personnel actions to prevent internal data leaks
Internal Dashboards / Data Grids / PDF Generators / Audit Trail
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[TECHNOLOGICAL STACK]

Engineering Stack and Architectural Standards

We do not use bulky constructors or ready-made themes. Development is carried out according to the principles of clean architecture and proven corporate standards.

Highload Backend & Storage

High-speed stacks for processing large transaction arrays.

  • PHP 8.3+ Native OPcache
  • Clean Architecture & DDD
  • MySQL 8.4 Partitioning
  • Redis InMemory Cluster
  • PostgreSQL Timescale
  • RabbitMQ Message Broker

Reactive Web & SPA

Interfaces with instant rendering and offline support.

  • Single Page Apps (SPA)
  • Progressive Web Apps (PWA)
  • Service Workers & Manifest
  • WebSockets Real-Time Sync
  • Tailwind CSS v4 Engine
  • State Management Architecture

Microservices & Protocols

Modern protocols for microservice communication with minimal latency.

  • gRPC & Protocol Buffers
  • RESTful API & JSON Schema
  • GraphQL Endpoints
  • API Gateway Routing
  • Event-Driven Architecture
  • SAP OData & RFC Connectors

Testing & Highload Auditing

Testing tools and metrics monitoring

  • Locust & JMeter Stress Load
  • Prometheus & Grafana
  • Sentry Realtime Crash Trace
  • Docker Microservices
  • Blackfire PHP Profiler
  • OWASP Top 10 Security Audit
[ METHODOLOGY AND STAGES ]

How We Implement Projects from Scratch

Transparent and controlled process without missed deadlines and unexpected budget expansions.

01

Technical audit and load modeling

We calculate the expected number of requests per second (RPS), data volumes, peak scenarios, and design the system topology.

02

Design of database and API architecture

Creating indexing schemes, event queues, and Swagger interface specifications for interaction between services

03

Engineering development in sprints (Agile)

Step-by-step writing of clean code, modular testing, and demonstration of ready system modules every 2 weeks.

04

Stress testing with load (Benchmark)

We simulate real traffic spikes using Locust/JMeter tools to check the service behavior under extreme load.

05

Production release and 90 days warranty for SLA

We deploy the platform on battle servers, connect to round-the-clock availability monitoring, and transfer all source repositories.

Our Clients

Companies that trust ALL IT Agency for development, scaling, and security of their digital solutions

DIM Service
Partner Case 6
Partner Case 11
TOV Zagin Alpha
Partner Enterprise
Partner Case 5
Valikhnovski Surgery Institute
Wizeclub
Meregi Group
DIM Service
Partner Case 6
Partner Case 11
TOV Zagin Alpha
Partner Enterprise
Partner Case 5
Valikhnovski Surgery Institute
Wizeclub
Meregi Group
[ FREQUENT QUESTIONS ]

Answers to questions from the client

Key details regarding terms, warranties, transfer of source code and the development process.

In 95% cases, the only correct solution is the development of MVP (Minimum Viable Product). This allows entering the market within 4–6 weeks with minimal costs, testing real client demand and attracting investments based on solid metrics, not assumptions. We lay the correct modular architecture, thanks to which MVP does not need to be discarded — it smoothly expands into a full-scale product.
Progressive Web App (PWA) is created as a single web application that immediately works on iOS, Android and computers. Users do not need to download it from App Store or Google Play (no fees 15–30% and long waiting times for moderation). At the same time, the app works offline, has an icon on the desktop and sends push notifications, saving up to 60–70% of development costs.
Stability is ensured by an asynchronous architecture: task queues in RabbitMQ, read and write distribution in databases, caching in Redis memory and static caching. Additionally, before release to production, we conduct stress testing, artificially applying load that exceeds the expected peak by 3–5 times.
Integration with SAP requires deep understanding of BAPI, RFC and OData protocols. Our engineers have practical experience in creating reliable gateways (API Bridges), which ensure secure and uninterrupted exchange of orders, customer data and warehouse balances between the website and SAP.
We use tested payment gateways (Stripe, WayForPay) with Webhook signature validation (HMAC), token encryption and idempotency of requests. This ensures that funds are never charged twice, and access to the platform is opened only after successful transaction confirmation by the bank.
100% intellectual property, code in Git repositories, documentation and architecture belong exclusively to your company. We prepare an official agreement on the transfer of copyright and property rights.

Solution needed according to specific requirements Your industry?

Find out how we adapt and deploy IT infrastructure and services for government agencies, healthcare, retail, HoReCa, logistics and construction sectors.

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Planning the Development of a Technological Service or SaaS Platform

Describe your business idea or current loads. Our architects will analyze requirements, select the stack and provide an engineering plan for implementation.

Confidentiality

Official NDA contract for system audit

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