API Engineering

API Engineering & Architecture

High-concurrency, resilient API gateways and microservices architectures engineered to unlock data silos and power AI ecosystems.

Expose your corporate data securely. KryoNex designs low-latency REST and GraphQL APIs, API gateways, and microservices layers built for sub-100ms response times, OAuth 2.0 security, and automated contract testing.
Microservices Transition
Mobile & Web Unification

Service Overview

Modern enterprises rely on APIs as their digital backbone. Poorly architected APIs create security vulnerabilities, integration bottlenecks, and expensive technical debt.

We engineer high-throughput API layers that securely expose legacy systems, decouple microservices, and enable external partner integration while maintaining sub-100ms SLAs and zero-downtime reliability.

Business Challenges Addressed

Data Silos & Fragmentation

Critical business logic is locked inside legacy applications that lack modern, programmatic access.

Brittle Point-to-Point Integrations

Systems are connected directly to one another using inconsistent protocols, meaning one system upgrade breaks the entire chain.

Inconsistent Security Models

Different teams have built APIs with varying authentication mechanisms, making global security audits impossible.

Ideal For

Distributed Enterprises

Organizations managing multiple specialized SaaS platforms that must share data seamlessly in real-time.

B2B Service Providers

Companies needing to securely expose their core capabilities to external partners or client development teams.

When to Consider

Microservices Transition

When breaking down a monolithic application into smaller, independently scalable services.

Mobile & Web Unification

When you need a single, unified backend API to power both your mobile applications and web portals.

Engagement Framework

Typical Scenarios

Enterprise API Gateway Design

Consolidating dozens of internal APIs behind a single, secure gateway with centralized rate-limiting and authentication.

Legacy System Wrapper (Strangler Fig)

Building a modern REST or GraphQL layer over a legacy SOAP or mainframe system to safely extract data.

Public Developer Platform

Engineering a highly documented, secure API platform specifically designed for public third-party developers.

Engagement Models

Architecture Review

A targeted audit of your current API strategy, identifying security risks, performance bottlenecks and architectural flaws.

Fixed Scope Project

End-to-end design and delivery of a specific API product, from initial OpenAPI specification to production deployment.

Delivery Methodology

Integration & Interface Strategy

We analyze data sources, map system dependencies, and author strict OpenAPI/GraphQL specifications before writing backend code.

OpenAPI / Swagger SpecificationsData Flow & Integration Blueprint

Security & Access Threat Modeling

We design OAuth 2.0 / JWT authentication, role-based access control, and rate-limiting rules to protect backend databases.

Security Threat ModelIdentity & Access Integration Plan

High-Concurrency Backend Engineering

We implement low-latency API logic, deploy mock servers for parallel frontend development, and configure sub-millisecond caching layers.

Mock API EndpointsProduction Backend Services & Caching

Contract & Performance Load Profiling

We execute rigorous load testing and contract verification to guarantee APIs maintain sub-100ms response times under extreme peak loads.

Load Test Performance ReportsAPI Gateway Infrastructure Config

Operational Responsibilities

KryoNex Responsibilities

  • Design the RESTful or GraphQL schemas.
  • Implement strict input validation to prevent injection attacks.
  • Engineer the caching layers (Redis/Memcached) for optimal performance.

Client Responsibilities

  • Provide access to the underlying data sources (databases, legacy systems, third-party APIs).
  • Define the business rules that govern data visibility and transformation.

Shared Responsibilities

  • Establish the long-term versioning and deprecation policy for the API.

Expected Deliverables

  • Custom API Implementation (Node.js/Go)
  • Interactive Developer Documentation (Swagger/Redoc)
  • API Gateway Routing Rules (Terraform)
  • Automated Contract Testing Suite

Success Criteria

  • API responds consistently under 100ms at the 95th percentile during peak expected load.
  • Zero undocumented endpoints or shadow APIs deployed.
  • Comprehensive test coverage validates all interface contracts against breaking changes.

Transition & Support

Post-deployment, we transition into active observability, setting up continuous monitoring for anomaly detection (e.g., unexpected spikes in 4xx/5xx errors). We provide ongoing support for schema evolution and backward-compatible versioning.

Technologies

Node.js / Go

For building highly concurrent, low-latency API services.

GraphQL / REST

Selecting the appropriate interface paradigm based on client querying requirements.

Redis

For implementing sub-millisecond data caching and distributed rate limiting.

Related Expertise

Frequently Asked Questions

Do you build REST or GraphQL APIs?

We build both. REST is typically preferred for standard B2B integrations and system-to-system communication, while GraphQL is often selected when powering complex front-end applications that require flexible data fetching.

How do you prevent a new API from crashing our legacy database?

We never expose legacy databases directly. We implement caching layers, queueing systems and rate-limiting at the API Gateway to ensure the legacy system only receives traffic it can safely handle.

Do you provide documentation for external developers?

Yes. We treat API documentation as a first-class deliverable, generating interactive, always-up-to-date documentation using the OpenAPI standard.

Request Technical Consultation

Skip the generic sales calls. Speak directly with a KryoNex Solutions Architect to map your current architecture, identify engineering bottlenecks and design a scalable path forward.

  • Architecture Mapping

    Review your current tech stack and bounded contexts with a senior engineer.

  • Execution Timelines

    Establish realistic milestones, engineering phases and capacity requirements.

Project Context

Tell us about the engineering challenges you are facing.