Matthew M.
FreelancerTop Rated PlusI build, stabilize, and scale production SaaS systems — especially the parts that tend to break under real usage: payments, authentication & permissions, data pipelines, and third-party integrations.
I’m a senior backend engineer who owns systems end-to-end: data models, APIs, background jobs, security boundaries, billing logic, and production stability.
I’m fluent in React / Next.js, which lets me ship complete features and debug across the stack, but my core value is building backend systems that don’t break.
Primary stack
Go · Java · C/C++ · Node.js
(React / Next.js for production UI integration)
Most of my work falls into one of three buckets:
- Launching SaaS products that must be production-ready from day one
- Stabilizing systems that are already live but brittle
- Untangling complex integrations (Stripe, auth, APIs, AI, data) that are blocking growth
Recent Production Work (selected)
MailTrace.ai — Backend from scratch
Designed and built the backend foundation end-to-end: data model, APIs, async job flows, billing gates, and cloud deployment. Integrated Stripe subscriptions, Auth0, and AI-assisted workflows for processing and insights.
$20k+ engagement, ongoing roadmap delivery.
Speedrun.so — Backend + admin platform
Built and hardened a production incentive/challenges platform with Web3 components and an AI-assisted moderation/admin system. Delivered with tight feedback loops and production-focused milestones.
$20k+ contract.
Sharpside Sports — Subscription & access control rescue
Rebuilt subscription logic, fixed Stripe webhook handling, tightened Supabase RLS policies, and stabilized multi-API analytics flows in production.
United States#1,042 / 136,353Top 0.76%
Matthew M. earns an estimated $7.2k/mo. That's 4.9× the typical freelancer and more than 99.74% of everyone we track.