Senior Developer for UI Polish and Backend Logic

We are a Danish startup building the core backend system for a two-sided service marketplace. This project focuses on database architecture, backend workflows, and structured matching logic — not design. · This platform matches customers with service partners based on service typ ...

Job summary · Overview: · I'm building a small but real product: a general-purpose AI evaluation engine.The app takes a short user input, runs it through a multi-criteria scoring system, and returns structured scores with explanations, displayed in a clean, card-based UI. · ...

We are seeking an experienced backend developer to audit our existing code for a live app hosted on SiteGround. · The recommendation logic is currently flawed, and we need someone to identify and rectify the business logic issues without a complete rebuild. · ...

+Job summary · This is a small assignment involving complex backend logic. · +ResponsibilitiesAnalyze existing backend flowModify or implement API logicWork with MongoDB queries/relationsDeliver a clean and working solution ...

We operate a production SaaS platform that monitors public-facing data sources and delivers real-time event notifications to subscribed clients. · Refactor existing Python ingestion logic · Correct pagination and early-exit behavior · Adjust deduplication logic · ...

We are looking for an experienced n8n Automation Specialist to build the backend logic for WhatsApp chatbot. · We have detailed Logic Flowcharts and User Experience diagrams ready. Your job is to translate these diagrams into a robust production-ready n8n workflow connected to Po ...

We have an existing iOS app in production and are looking for an experienced developer to implement V1 improvements across performance, subscriptions, invites/referrals, analytics gating, and basic admin controls. · This is not a rebuild. · Scope of Work · App Performance (V1) · ...

We are looking for an experienced software development agency / software house to prepare a technical proposal and cost estimate for the development of an iOS mobile application with backend services, · AI-based personalization logic, · and cloud infrastructure.This is a producti ...

I have a Bubble app with a backend workflow partially built. · ...

I'm building a web application with Xano as the system of record and an API-driven frontend. · The system includes: · Multiple user roles (end users, external partners, admins) · Backendenforced permissions and rolebased access · ...

Seeking a Backend Developer for an iGaming platform focusing on game logic fairness and performance. · ...

We need a backend engineer to help integrate with the Salla Marketplace by handling webhooks and configuring app-side logic.Listen to and validate Salla webhook events · Forward events to our backend (Apollo running on AWS EKS) · Configure and implement backend app logic · E nsur ...

Migrate Bubble app database to Xano for scalability and performance. · ...

We are looking for a senior backend engineer to finalize and clean up the backend logic of a premium iOS app. · Auth & account system using Clerk only (no Supabase Auth) · Invite codes system · Venues availability logic · Booking system with Stripe integration · ...

We are looking for an experienced Backend Engineer to build a secure, API-first backend service for a B2B SaaS product. · This project focuses on rule-based validation logic, low-latency API design and robust database modeling. ...

We are looking for an experienced professional to perform a focused audit of an existing application.Strong Bubble backend experience system logic analysis and clear communication are required. · ...

Nous recherchons un développeur logiciel ayant une solide expérience en Delphi. · Maintenir les systèmes backend développés en Delphi, · Développer la logique d'affaires via des scripts SQL, · Analyser la performance backend, · Collaborer avec l'équipe pour intégrer le backend av ...

I have built a web-based prototype using Base44 that is very close to launch but needs proper deployment on Vercel. · The frontend UI and core functionality are already built but need backend logic completion. · ...

We are building a medical triage intake experience inside a WordPress website using Elementor. · This project is frontend only. You will not build the AI logic or backend systems. Using Elementor: Guided multi-step intake "quiz", Conditional logic between questions,Patient contac ...

I'm looking for an experienced backend developer to assist with a small but critical task in a production environment. · This is a focused backend change inside an existing system. · Scope of Work:Update or adjust a single backend API logicValidate request and response handlingMa ...