You will get a production-ready REST API for your web app or SaaS platform
Project details
You will get a production-ready REST API built for your web application, SaaS platform, internal tool, or business system.
I can help design and develop backend APIs using Java Spring Boot, Node.js, Go, MongoDB, SQL, and REST API best practices. This project is ideal if you need new backend functionality, database-backed endpoints, third-party API integration, business logic, or help connecting your frontend application to reliable backend services.
Depending on your package, I can build endpoints, define request and response models, add validation, connect databases, integrate third-party services, improve error handling, provide source code, and deliver documentation for handoff.
Common use cases include SaaS backend features, admin dashboards, internal tools, customer portals, data workflows, API integrations, and modernization of existing backend systems.
Before development begins, I will review your requirements, sample data, expected API behavior, existing codebase, database structure, and integration needs so the final solution fits your application and business process.
I can help design and develop backend APIs using Java Spring Boot, Node.js, Go, MongoDB, SQL, and REST API best practices. This project is ideal if you need new backend functionality, database-backed endpoints, third-party API integration, business logic, or help connecting your frontend application to reliable backend services.
Depending on your package, I can build endpoints, define request and response models, add validation, connect databases, integrate third-party services, improve error handling, provide source code, and deliver documentation for handoff.
Common use cases include SaaS backend features, admin dashboards, internal tools, customer portals, data workflows, API integrations, and modernization of existing backend systems.
Before development begins, I will review your requirements, sample data, expected API behavior, existing codebase, database structure, and integration needs so the final solution fits your application and business process.
Programming Languages
Java, TypeScript, GoCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$200
|
Standard
$1,000
|
Advanced
$5,500
|
|---|---|---|---|
| Delivery Time | 5 days | 10 days | 21 days |
Number of Revisions | 1 | 2 | 3 |
Number of Pages | 1 | 3 | 5 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$400 - $1,250
Additional Revision
+$200
Additional Page
(+ 3 Days)
+$500
API Documentation
+$500
Authentication Setup
(+ 3 Days)
+$1,000
Database Integration
(+ 3 Days)
+$750Frequently asked questions
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TM
Timothy M.
Jul 1, 2020
GO lang programmer to help with API / Postgres
Devin came and resolved an API issue quickly. Will definitely use him again.
JF
Jim F.
Nov 20, 2018
RPA Developers to deliver World-Class Client Solutions
Devin did a good job for us, using a tool he had never used before and delivering solid results. I'm sure over time, he will get much better on this new tool!
About Devin
Senior Backend & Full-Stack Engineer | APIs, SaaS, AI Fortune 100
Charlotte, United States - 6:26 am local time
I help businesses turn software ideas, broken systems, and stalled development work into production-ready applications.
I’m a senior software engineer with experience building and maintaining enterprise software for Fortune 100/Fortune 30 environments, including platforms involving React, TypeScript, Java/Spring Boot, Go, MongoDB, REST APIs, cloud services, integrations, automation, and AI-augmented workflows.
Clients usually come to me when they need someone who can step into complexity quickly, understand the business problem, and deliver clean, maintainable software without needing constant hand-holding.
What I can help with
* Full-stack web application development
* Backend API development with Java/Spring Boot, Go, Node.js, and REST
* React, TypeScript, Angular, and frontend component development
* MongoDB and SQL database design, queries, and data workflows
* SaaS MVP development and feature implementation
* API integrations, third-party services, and internal tools
* AI-assisted software workflows, automation, and productivity tooling
* Debugging, refactoring, performance improvement, and technical cleanup
* QA regression planning, test strategy, and release readiness
* Technical documentation, architecture planning, and backlog creation
Why work with me
I bring more than coding ability. I understand software delivery from both the engineering and business side. I can work from a rough idea, a Figma design, a backlog, an existing codebase, or a messy production issue and turn it into a clear execution plan.
I’ve worked across enterprise systems where reliability, maintainability, security, and clear communication matter. I’m comfortable collaborating with product managers, designers, QA teams, business stakeholders, and other engineers.
Common projects I’m a good fit for
* “We need an MVP built.”
* “Our current developer left, and we need someone to take over.”
* “Our React app needs new features or cleanup.”
* “We need backend APIs built or fixed.”
* “We need help integrating AI into our workflow.”
* “We need a technical person to turn requirements into tickets.”
* “We need production-level software, not just a prototype.”
## Tech stack
React, TypeScript, JavaScript, Angular, Java, Spring Boot, Go, Node.js, Express, MongoDB, SQL, REST APIs, Git, Docker, CI/CD, cloud services, API integrations, testing, automation, and AI-assisted development workflows.
If you need a reliable engineer who can understand the problem, communicate clearly, and move the project forward, send me a message, and I’ll help you map out the next step.
Steps for completing your project
After purchasing the project, send requirements so Devin can start the project.
Delivery time starts when Devin receives requirements from you.
Devin works on your project following the steps below.
Revisions may occur after the delivery date.
Requirement Review
I review your API requirements, user stories, sample data, integrations, and desired outcome.
API Design
I define endpoints, request and response models, validation rules, database needs, and integration flow.