AI-first engineering. Senior-only API developers. Build secure, scalable APIs and microservices architecture at 40–60% lower cost with a dedicated team that ships production-ready endpoints from week one.
Clients Worldwide
Projects Shipped
Client Retention
Onboarding
The wrong development partner turns a straightforward API build into a months-long integration nightmare. Here's what we see engineering teams deal with before they find us.
Your vendor shipped a monolith disguised as microservices. Now every deploy breaks three other services and your team is afraid to touch the codebase.
Undocumented endpoints, inconsistent naming conventions, and no versioning strategy. Six months later your frontend team is maintaining a map of which APIs actually work.
Microservices architecture requires senior judgment not just code output. Juniors build services that work in isolation and fail under real production load.
Custom API gateways, undocumented internal frameworks, and teams that disappear post-handoff. You own the endpoints but can't maintain or extend them without going back to the vendor.
We're not another offshore dev shop. Devlyn is an AI-driven, product-led engineering partner that takes ownership of your API architecture outcomes.
AI reviews every PR before a human does catching contract violations, flagging schema drift, and benchmarking against your API standards. 40% fewer post-deployment defects.
Every developer has 5+ years of production API experience. No juniors learning microservices patterns on your dime. You get architecture ownership from day one.
Submit your requirements and your dedicated API team starts within 48 hours. No weeks-long procurement cycles or discovery phases before a line of code ships.
Daily standups. Shared Slack channels. GitHub and Postman access from day one. You see every endpoint, every contract decision, every architectural tradeoff documented.
Global-calibre API engineers at 40–60% lower cost. Agile methodology, CI/CD pipelines, and overlap hours designed around your timezone.
Every model includes full IP ownership, NDA protection, and dedicated project management. Scale up or down no long-term lock-in.
Model |
Best For |
You Control |
Pricing |
|---|---|---|---|
|
Dedicated API Team |
Long-term API products, microservices migration, ongoing development |
Roadmap, priorities, daily standups |
Monthly retainer |
|
Project-Based |
Fixed-scope API builds, third-party integrations, specific microservice extraction |
Milestones, UAT, sign-offs |
Fixed price |
|
Team Augmentation |
Filling API skill gaps in your existing engineering team |
Direct management of each developer |
Time & material |
|
Offshore / Remote |
Cost optimisation with full API architecture oversight |
Shared tools, async + sync updates |
Flexible models |
From greenfield API design to legacy monolith decomposition, we build every layer of your integration architecture so your product connects, scales, and ships.
Resource-oriented design, consistent naming conventions, versioning strategy, and OpenAPI documentation built to last beyond the first integration.
Flexible query architecture, schema-first design, real-time subscriptions, and resolver optimization for frontend teams that need data on their terms.
Domain-driven service decomposition, inter-service communication patterns, and fault-tolerance design built for teams ready to move beyond the monolith.
Kong, AWS API Gateway, or custom gateway implementation with rate limiting, authentication, routing, and request transformation across your service mesh.
Payment gateways, CRMs, ERPs, communication platforms, and data providers clean integration layers that don't leak vendor complexity into your core product.
Kafka, RabbitMQ, and SQS-based async messaging systems for services that need to communicate without tight coupling or synchronous dependencies.
OAuth 2.0, JWT, API key management, rate limiting, and OWASP API security top 10, security built into the contract, not bolted on after launch.
Migrate SOAP services, monolithic backends, and undocumented internal APIs to modern REST or GraphQL without breaking existing consumers or downtime.
We're not a one-framework shop. Every project uses the stack that best serves its performance, integration, and scalability requirements.
Node.js / Express
NestJS
Laravel
Python / FastAPI
Go
GraphQL
REST
GraphQL
gRPC
WebSockets
OpenAPI 3.0
AsyncAPI
Apache Kafka
RabbitMQ
AWS SQS / SNS
Redis Pub/Sub
WebSockets
AWS API Gateway
Kong
NGINX
Traefik
Apigee
AWS
GCP
Azure
Docker
Kubernetes
Terraform
PostgreSQL
MySQL
MongoDB
Redis
Elasticsearch
Amazon S3
Node.js / Express
NestJS
Laravel
Python / FastAPI
Go
GraphQL
REST
GraphQL
gRPC
WebSockets
OpenAPI 3.0
AsyncAPI
Apache Kafka
RabbitMQ
AWS SQS / SNS
Redis Pub/Sub
WebSockets
AWS API Gateway
Kong
NGINX
Traefik
Apigee
AWS
GCP
Azure
Docker
Kubernetes
Terraform
PostgreSQL
MySQL
MongoDB
Redis
Elasticsearch
Amazon S3
Years of Delivery
Projects Shipped
Clients Globally
Client Retention
Fintech
SaaS
Healthcare
E-commerce
Logistics
EdTech
Real Estate
Manufacturing
Media
Startups Building Their First API Layer
You need a clean API foundation your frontend, mobile, and third-party consumers can build on without constant changes. We build contract-first, document everything, and hand you an API your team can maintain.
Enterprises Decomposing a Monolith
You have a working monolith and a mandate to move to microservices. We extract services domain by domain no big bang rewrite, no downtime, no broken consumers while you migrate.
Product Companies Scaling Integrations
Your product is winning deals that require integrations you don't have. We build the integration layer clean, versioned, and decoupled from your core product so new connectors ship in days, not sprints.
CTOs Fixing an Inherited API Mess
Undocumented endpoints, inconsistent authentication, no versioning strategy. We audit, document, and refactor your existing API layer so your team can ship features instead of fighting integrations.
It depends on scope, complexity, and integration requirements. A single-service API build typically starts at $14,400, while a full microservices migration or multi-integration platform can exceed $100,000. We offer both fixed-price and time-and-material models. Every project starts with a free scoping session and transparent estimate no hidden fees.
A focused REST API build runs 4–6 weeks. A microservices architecture migration from a monolith runs 3–6 months depending on service count and existing test coverage. We scope every project specifically, timelines are anchored to your actual service boundaries, not boilerplate estimates.
REST is the right default for most public APIs, third-party integrations, and resource-based operations. GraphQL is better when your frontend teams need flexible data queries, you have multiple clients with different data needs, or you're building a developer platform. We'll recommend the right fit for your specific consumer landscape not the one we prefer to build.
We design inter-service communication based on your latency and reliability requirements. Synchronous flows use REST or gRPC with circuit breakers. Async flows use Kafka or RabbitMQ with dead-letter queues and retry policies. Service discovery via Consul or Kubernetes-native DNS. Nothing is bolted on the communication pattern is part of the architecture sign-off in week one.
OAuth 2.0 and JWT are standard on every engagement. We implement rate limiting, input validation, CORS policies, and OWASP API Top 10 controls from day one. For regulated industries, we layer in API audit logging, encryption in transit and at rest, and compliance-aligned access control. Security is a contract requirement not a post-launch checklist.
URI versioning by default, clean, explicit, and consumer-friendly. Semantic versioning on all schemas. Deprecation policy documented and communicated to consumers before breaking changes ship. We maintain backward compatibility for a defined period on every version no surprise breakages in production.
Standard MSA assigns all IP to you. Mutual NDA signed before access provisioning. Engineers operate fully within your cloud accounts and GitHub org, source code never leaves your perimeter. SOC 2-aligned controls available on request for regulated environments.
We start with an API audit documenting existing endpoints, identifying contract gaps, security issues, and performance bottlenecks. From there we recommend the smallest intervention that solves the real problem. Some APIs need refactoring. Some need versioning. Some need a migration plan. We'll tell you which not upsell a full rebuild when it isn't warranted.
Book a free consultation with a Devlyn API architect. We'll review your integration requirements, recommend an approach, and provide a transparent estimate, no pressure, no obligations.
48-hour onboarding
100% IP ownership
No long-term lock-in
