Backend Developer

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: TYPE OF WORK

Full Time

: WAGE / SALARY

Up for discussion

: HOURS PER WEEK

40

: DATE UPDATED

May 27, 2026

JOB OVERVIEW

Backend Developer — Spare Hand StudentsSpare Hand Students is a fast-growing marketplace platform connecting college students with homeowners and businesses who need help with lawn care, cleaning, errands, moving, and more. We operate across multiple cities in Texas and are scaling fast. We are looking for a strong backend developer who knows C# .NET inside and out and uses AI tools as a core part of how they work — not as a crutch, but as a force multiplier that helps them ship better code faster.This is a hands-on role on a small, high-output team. You will work directly with our founders and existing developers on live production systems that real students and real customers depend on every day. The problems are interesting, the stakes are real, and the work you ship will be visible immediately.What you will be building
Reliability and strike system — automated logic that tracks student no-shows, cancellations, and suspensions with escalating consequences
Dynamic commission rate engine — per-job fee calculation that adjusts based on star ratings, performance criteria, and strike history
Recurring job scheduling — backend logic for biweekly and monthly job schedules with automated reminders and matching
Referral attribution engine — token tracking, deferred deep link attribution, dual-sided reward triggers, and fraud prevention
Real-time push notification infrastructure — job alerts, confirmation gates, escalation logic, and multi-push sequences for unmatched jobs
Admin panel APIs — endpoints that give the operations team full visibility and control over jobs, students, customers, and i ----------
Payment processing — Stripe integration for job payments, tip processing, wallet credits, and commission splits
SendGrid automation — API integration for transactional emails, post-job sequences, and win-back campaigns
Authentication systems — Apple Passkey, Samsung Passkey, phone number OTP verification, and session management
Fraud prevention — device fingerprinting, IP matching, velocity checks, and duplicate account detection
Technical requirementsBackend — C# / .NET (required, must be strong)

Production-proven experience with C# ---------- — this is non-negotiable
REST API design, versioning, and documentation
Relational database design — schema architecture, migrations, indexing, query optimisation
Background jobs, scheduled tasks, queue processing, and event-driven logic
Stripe or equivalent payment API integration
Push notification delivery via APNs and FCM
SendGrid transactional and marketing API
Authentication — JWT, OAuth, OTP, passkey standards
Security fundamentals — input validation, rate limiting, fraud detection patterns
Experience with automated rules engines and threshold-based consequence systems
AI proficiency (required)

You actively use AI coding tools — Claude, ChatGPT, GitHub Copilot, or similar — as a regular part of your development workflow
You know how to write precise, well-structured prompts that get useful output rather than generic code you have to rewrite
You use AI to accelerate code review, catch edge cases, generate boilerplate, write tests, and think through architecture — not just autocomplete
You understand the limitations of AI-generated code and always review, test, and own what you ship
Bonus: experience building features that integrate AI into the product itself — smart matching, automated content, anomaly detection, or similar
What would make you stand out
You have built a marketplace, gig platform, or labour dispatch system before
You have designed a strike or reputation system with automated enforcement logic
You have built a dynamic fee or commission calculation engine
You understand referral attribution end to end — from link click through deferred deep link install to reward trigger
You have built fraud prevention systems — duplicate account detection, device fingerprinting, velocity throttling
You have worked directly with a small founding team and are comfortable owning backend systems end to end without hand-holding
You can read someone else's codebase, understand it quickly, and contribute without breaking things

SKILL REQUIREMENT

C# AI Tools

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Backend Developer

Please login or register as jobseeker to apply for this job.

TYPE OF WORK

WAGE / SALARY

HOURS PER WEEK

DATE UPDATED

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