Backend Developer Needed for Consumer Caregiver App We’re building a caregiver app that helps families keep track of a loved one’s care information, including diagnoses, medications, surgeries, notes, and tasks. This is a direct-to-consumer app, not a hospital or clinic product, so we need someone who can build a secure, privacy-first backend for sensitive health data. What you’ll build: - User authentication and account management. - Care recipient profiles. - Structured health records for diagnoses, medications, surgeries, allergies, appointments, notes, and care tasks. - Role-based sharing for multiple caregivers. - Secure file storage for documents or images. - Audit/activity logging. - Export and deletion features. - Admin tools for support and account recovery. What we need: We’re looking for a backend developer who can build a clean, secure, production-ready system with strong privacy controls. Required experience: - Strong backend development experience. - Experience with Postgres and secure API design. - Understanding of authentication, authorization, and role-based access control. - Experience with encryption, secure file storage, and logging. - Comfortable working with consumer health or sensitive data. - Ability to document architecture and hand off code cleanly. Nice to have: - Experience with healthcare, healthtech, or privacy-sensitive apps. - Experience with Supabase or AWS. - Familiarity with FTC health privacy expectations for consumer apps. - Experience designing systems that can scale into stricter compliance later. Preferred stack For this project, we’re leaning toward a cost-friendly, modern stack such as: - Front end: Lovable. - Backend: Supabase or a similar managed Postgres backend. - Auth: built-in auth with strong password/session handling. - Storage: private file storage. - Permissions: row-level security or equivalent. - Optional server logic: edge functions or a small Node service. If you think a different stack is better, explain why. Security and privacy expectations: This app will store sensitive family health information, so security matters a lot. We need the backend to include: - Encryption in transit and at rest. - Strong access controls. - Minimal data collection. - No unnecessary third-party tracking or ad-tech. - Audit logs for important actions. - Secure password handling. - Private storage and restricted file access. - Clear privacy-aware architecture. Important note: This is not a hospital backend. We do not need a complex enterprise healthcare platform on day one. We do need someone who understands how to build a secure consumer health app properly, with the option to evolve later if the product grows. Deliverables: 1. A short architecture proposal. 2. Recommended stack and rationale. 3. Basic database schema. 4. Security and permissions plan. 5. Estimated timeline and budget. 6. Build the MVP backend after approval. Please send: - A short intro. - Relevant backend projects. - Any healthcare, privacy, or sensitive-data experience. - Your preferred stack. - Your estimated cost and timeline. - One example of a backend system you’ve built that required careful permissions or security.

We are looking for a Back-End Developer to lead the development of back-end services that enhance enterprise security, streamline identity management, and ensure secure access throughout the organization. In this crucial role, you will be responsible for designing and implementing systems that authenticate users, manage user permissions, safeguard sensitive business information, and facilitate secure communication between various internal applications and enterprise platforms. This position differs from traditional back-end roles, which typically focus primarily on business logic and data processing. Instead, this role emphasizes the creation of a highly secure back-end infrastructure that protects organizational resources while delivering reliable, scalable authentication and authorization services to meet our enterprise's complex needs. Your contributions will directly impact compliance initiatives, strengthen cybersecurity efforts, and enhance the protection of mission-critical business systems. As an ideal candidate, you will enjoy tackling intricate security challenges, designing distributed back-end architectures, and developing resilient infrastructures to effectively defend our enterprise against emerging threats. In this role, you will closely collaborate with cross-functional teams, including front-end developers, security experts, and system architects, to ensure that security considerations are integrated into every aspect of the development process. Additionally, you will be expected to stay updated with the latest trends in cybersecurity and back-end technologies, contributing innovative solutions that align with industry best practices. The following are the required skills and qualifications for this position: - Strong experience with one or more of the following programming languages: Java, Kotlin, C#, Node.js, Go, or Python. - Experience in designing secure RESTful APIs and distributed back-end services. - Knowledge of authentication frameworks, including OAuth 2.0, OpenID Connect, and JWT. - Experience working with both relational and NoSQL databases. - A solid understanding of back-end security principles and secure coding practices. - Familiarity with Docker, Kubernetes, or cloud-native back-end deployments. - Excellent analytical and problem-solving skills.

We are looking for a Back-End Developer to create secure backend platforms that enhance identity management systems, automate business workflows, and provide reliable infrastructure essential for organizational operations. In this crucial role, you will be responsible for designing and developing backend services that include key functions such as authentication and authorization mechanisms, comprehensive workflow orchestration, event processing, audit logging, secure data exchange, and ensuring the reliability of enterprise platforms. You will have the opportunity to translate complex and diverse business requirements into resilient backend services designed to facilitate secure collaboration among various departments. This role will involve ensuring compliance with all relevant regulatory standards while maintaining high performance and operational stability. The ideal candidate will have a deep understanding of distributed systems and will enjoy tackling the challenges of designing secure architectures. Additionally, you will be expected to develop backend platforms that support mission-critical enterprise applications, ensuring these systems operate smoothly under varying conditions. Your expertise will drive the creation of innovative solutions that not only meet immediate operational needs but also position the organization for future growth and scalability. If you are passionate about building robust backend services and committed to excellence in enterprise application development, we would love to hear from you. The qualifications required for this position are as follows: - Strong experience in developing enterprise-level backend applications using modern programming languages, such as Node.js, Java, C#, Python, or Go. - Experience in designing secure RESTful APIs and distributed backend services. - A solid understanding of authentication protocols, authorization models, and enterprise security principles. - Experience working with both relational and NoSQL databases. - Knowledge of asynchronous processing, message queues, and event-driven architectures. - Experience in building scalable applications that are deployed in cloud environments. - Familiarity with containerization technologies, such as Docker, and orchestration platforms, such as Kubernetes. - A strong understanding of software architecture, clean code principles, and backend design patterns. - Excellent analytical, debugging, and problem-solving skills.

We are seeking a skilled freelancer to update the backend of our website. The project involves implementing new features, optimizing performance, and ensuring security. The ideal candidate will have experience with web development and backend technologies, and be able to work independently to deliver high-quality results.

We are looking for a developer with extensive knowledge of JavaScript who can build a backend from scratch using Express.js and MongoDB (Mongoose), has strong knowledge of JSON, APIs, Redis, Node.js, the EJS template engine, HTML and CSS. Has good understanding on how to debug web applications (such as missing files, missing or bad API responses, non-trivial JavaScript bugs that break the application). Can read and modify compiled Next.js, Nuxt.js, other frameworks or obfuscated JavaScript code without the original source code. Has basic knowledge of Next.js, Nuxt.js and other frameworks. Has ability to write JavaScript helpers to automate certain tasks e.g. operations on strings, arrays, objects, files or processing data to match a required structure. Has basic networking knowledge. Basic reverse engineering skills.

Looking for a React/Supabase developer to build a backend for an existing web app. Responsibilities include implementing user authentication using Supabase Auth and designing a database schema. The ideal candidate will have experience in backend development and a strong understanding of React and Supabase.

Duties and Responsibilities: - Primarily work on backend systems such as API servers written in Go (Golang) and are backed by a variety of SQL and NoSQL databases. - Ability to work on software development kits in a variety of languages (e.g. Python, R, Typescript) to assist code consumption of backend systems. - Feature development will include tasks like: o Ingesting data from third party systems and loading them into our in-house data stores o Implementing API handlers to serve in-house data out to internal systems and users o Creating web apps to visualize the data in meaningful ways for the front office to manage in-season operations o Creating web apps to monitor and manage the data flows for front office admins to control

Overview I am looking for an experienced Python developer to build a stand-alone desktop research application for futures trading strategy analysis. This is not an automated trading bot and does not require live trading execution. The purpose of this software is to replace manual backtesting and allow systematic research of Opening Range Breakout (ORB) strategies. The application will allow a trader to quickly test strategy variations, compare results, and identify robust parameters without manually running hundreds of backtests. Accuracy of results is the highest priority. Project Goal Build a desktop application where the user can: Select a futures market Load historical data Configure ORB strategy parameters Run single tests or multiple parameter combinations Analyze results Compare experiments side-by-side Save research results The software should be simple and user-friendly. Platform Stand-alone desktop application. Primary requirement: Windows Desired: macOS compatibility The user should not need: TradingView Excel FX Replay Coding knowledge The software should open like a normal desktop application. Supported Markets (Version 1) The architecture should support: Nasdaq Futures NQ MNQ S&P 500 Futures ES MES The system should properly handle: Tick size Tick value Contract specifications The design should allow additional futures markets to be added later. Data Requirements Historical Data Integration with: Databento API Requirements: 1-minute historical data User-selectable date ranges Ability to build higher timeframe candles from 1-minute data Supported research candles: 1 minute 3 minute 5 minute 10 minute 15 minute ORB Strategy Engine Standard ORB User can select: 1 minute 3 minute 5 minute 10 minute 15 minute opening range Dynamic ORB (Anchor ORB) User can select: 1 minute 3 minute 5 minute 10 minute 15 minute Logic: The first candle that closes outside the opening range becomes the new ORB anchor. The closing price of that candle becomes the reference level for entries. Entry Types Version 1 supports: Breakout entry Dynamic ORB anchor entry Stop Loss Testing User can test: 25% 33% 50% 66% 75% 100% Stop size is based on ORB size. Profit Target Testing The software must support testing multiple R targets: From: 0.5R to 10R In: 0.5R increments Example: 0.5R 1R 1.5R 2R etc. Risk Management Support: Fixed Dollar Risk Example: $100 $250 $500 Percentage Account Risk Example: 0.5% 1% 2% Filters ORB Size Filter User selectable: Minimum: 0.10% Maximum: 2.00% Day of Week Filter Allow testing: Monday Tuesday Wednesday Thursday Friday News Filters Option to exclude: High-impact economic news days FOMC days Federal Reserve Chair speech days Research Engine The software must support: Single Backtest Run one specific strategy configuration. Multi-Variable Testing Allow combinations of: Market ORB duration ORB size Entry type Stop size Profit target Day filters News filters Example: Test: 10 ORB sizes 6 stop sizes 20 profit targets Multiple markets Automatically generate and run experiments. Parameter Locking Important feature: The user must be able to lock certain parameters while testing others. Example: Lock: Entry type Risk model Optimize: ORB size Stop Target This prevents unnecessary over-optimization. Results Dashboard Display: Performance Metrics Net Profit Profit Factor Expectancy Win Rate Total Trades Average Winner Average Loser Maximum Drawdown Largest Winning Streak Largest Losing Streak Charts Required: Equity Curve Drawdown Curve Experiment Comparison Allow side-by-side comparison. Example: Strategy A vs Strategy B Compare: Parameters Profit Factor Expectancy Drawdown Trade count Win rate Saving Research Users should be able to: Save experiments Reopen experiments Save notes Technical Preferences Preferred: Python backend Open to developer recommendations for: Desktop framework Database Architecture Experience preferred with: Financial applications Backtesting systems Time-series data Quantitative research tools Important Developer Qualifications Please have experience with: Event-driven backtesting Historical market data Avoiding look-ahead bias Accurate trade simulation Parameter optimization This project is research-focused. A simple candle backtester is not sufficient. Application Requirements Please provide: Examples of similar work GitHub or portfolio links if available Recommended technology stack Estimated timeline Fixed-price estimate Budget Expected MVP range: $4,000–$7,000 (depending on experience and recommended architecture) This project may expand into future versions after successful completion. Final Note The goal is to build a reliable research tool that allows systematic testing of futures strategies. The first version should prioritize: Accuracy Simplicity Ease of use Clean architecture for future expansion

We run a production backend for an AI-powered platform that helps users identify scams over voice and text in real time. It is live and functional today, built by our current lead backend engineer. We are hiring a second senior engineer to work alongside the existing codebase: validating the architecture, closing out remaining features, and adding capacity so the project is not dependent on a single developer. Stack: Python, FastAPI, Firebase, Firestore, Google Cloud Platform, Cloud Run, Twilio Voice and SMS, Stripe, LLM API integration (Anthropic, OpenAI, or similar), speech to text / text to speech pipelines. What you will do: Review and validate the existing backend architecture and Firestore data model Help close out remaining features ahead of a pilot launch Improve reliability, security, and production readiness where needed Work as ongoing backend capacity going forward You should have: Senior-level Python and FastAPI experience in production Real production experience with Firebase, Firestore, and Cloud Run Experience inheriting and working within an existing codebase, not just building from scratch Twilio voice or SMS experience strongly preferred Experience with Stripe and LLM API integrations a plus Clear written English and some overlap with US Eastern Time To apply, answer this: Describe a time you inherited another developer's production codebase. What was your approach to understanding it, identifying issues, and improving it without disrupting the existing system? Please skip generic template proposals. Repository access and full technical scope provided after a signed NDA.

We are seeking a Mid to Senior-level Fullstack Developer (3–5 years of experience) to not only maintain and expand our platform (Next.js frontend + Django backend) but also guide us in fully integrating AI-powered coding assistance across the full stack. The frontend is already set up for AI-assisted editing (e.g. Cursor), and we want to evolve our backend similarly. The ideal candidate will help us transition the entire development environment, so both we and the developer can leverage state-of-the-art AI coding tools. Beyond coding, you’ll act as a mentor, helping us better understand the backend’s architecture and workflows while integrating AI-driven development tools into our process. You’ll have a key role in making our stack both stable and future-ready, with AI-assisted flexibility. The Context Our frontend was recently ported to Next.js in an ad-hoc manner, leaving certain sections in need of refactoring and stabilization. We have committed to keeping our backend in Django to leverage its robust processing capabilities. You will be the point person for bridging these two environments. Key Responsibilities -Maintenance & Stability: Perform routine maintenance and optimization across the full stack. -Bug Fixing: Identify and resolve issues within the existing Next.js frontend and Django backend. -System Reliability: Provide technical support and troubleshooting during system downtime. -Feature Implementation: Build and deploy new features, ensuring seamless integration between the AI pipeline and the user interface. Required Technical Profile -3–5 years of professional fullstack experience. -Frontend: Proficiency in Next.js and React; experience cleaning up/refactoring "messy" or legacy codebases is a plus. -Backend: Strong experience with Django (Python), specifically working with complex data pipelines or API integrations. -Mindset: A pragmatic approach to coding—balancing the need for new features with the necessity of technical debt reduction.