- Hourly
- Intermediate
- Est. time: More than 6 months, 30+ hrs/week
Join our team as a Senior Software Engineer to develop and maintain backend services for our project management platform. You'll work with a small team to design, implement, and deploy features, ensuring high performance and reliability. Collaborate with frontend engineers to integrate APIs and support the development of new features. This role requires strong problem-solving skills and the ability to work independently.
- Hourly: $70.00 - $85.00
- Expert
- Est. time: 3 to 6 months, 30+ hrs/week
OVERVIEW We are a technical advisory firm that partners with VC-backed companies to design, build, and scale their engineering foundations. We embed with our clients as a core part of their technical team, not as outside consultants handing over a document, but as engineers who own the outcome alongside them. Our current client is a VC-backed company operating in the auto logistics space. They're at an exciting and critical stage: they have product-market fit, they have backing, and now they need to build the production infrastructure to match their ambitions. We've been brought in to lead that build, and we're looking for a senior full stack engineer to join us for it. This is a greenfield backend API platform built in TypeScript on Node.js with Express or Fastify, and you'd be involved from the very beginning. That means shaping the architecture, setting the patterns, and building something that will need to handle real production load in a fast-moving, operationally complex industry. The backend we're building needs to be reliable, well-structured, and built to grow. If you want to do meaningful backend work on a greenfield codebase, in a real industry with real complexity, working with a team that has high standards, this is the opportunity. WHAT YOU'LL BE BUILDING A production-grade backend API platform in TypeScript on Node.js, using Express or Fastify. Because we're starting from scratch, the early decisions carry significant weight and you'll be part of making them. API architecture, project structure, middleware conventions, authentication approach, error handling, observability, data access patterns: these are all on the table and we want engineers who have opinions about them informed by experience. Day-to-day you'll be writing and reviewing TypeScript, contributing to architecture and design discussions, collaborating with the team on Slack, and joining at least one Zoom sync per week with the broader team and client stakeholders. WHAT WE'RE LOOKING FOR - 5 to 10 years of professional software engineering experience with a strong backend or full stack background. Specifically: - Fluent in TypeScript with a solid working knowledge of the Node.js runtime, including async patterns, error propagation, and performance characteristics, not just the surface API - Hands-on Express and/or Fastify experience with real APIs built using them, a clear understanding of their trade-offs, and the ability to make informed structural decisions without needing to be guided - A track record of shipping and operating production systems, having been accountable for something running live, having handled production incidents, and thinking seriously about reliability, logging, and failure modes. - Comfort operating in a greenfield environment with some ambiguity, able to ask the right questions, help define what isn't yet defined, and take ownership of outcomes rather than waiting for a fully formed spec. - Strong English communication skills, written and spoken. We're a distributed team, async-first on Slack, and we interface directly with a client whose business is moving fast. Clear communication is as important as clean code US-based strongly preferred with meaningful overlap with US business hours required for team and client collaboration NICE TO HAVE - Cloud infrastructure experience (AWS, GCP, or Azure) - Familiarity with authentication protocols (OAuth 2.0, OIDC) - API versioning strategy experience - CI/CD pipeline experience - Domain familiarity with logistics, fleet management, or supply chain systems is a genuine bonus HOW WE WORK We are a tight team with high standards and low tolerance for vague communication or dropped balls. Slack is our primary channel, async-first with responsiveness expected during working hours. We sync on Zoom at least weekly, more often during active design and planning phases. We use Jira for our ticket management. You'll receive a Microsoft 365 account on hire for SSO access to all internal and client tooling from day one. We don't micromanage. What we do expect is proactive communication, early flagging of blockers, and the kind of ownership that comes naturally to engineers who treat a codebase as something worth getting right, not just getting done. On a greenfield project with a client at a pivotal growth stage, that distinction matters. HIRING PROCESS - Intro call (15 min) - the firm, the client, the project, your background, and your questions - Technical screen (if applicable, via Coderbyte) - Background check - standard criminal background check required for all hires, no exceptions - Offer and onboarding - Microsoft 365 account and full tooling access provisioned before day one HOW TO APPLY We read every proposal that makes a genuine effort. Please include: - A description of a production backend system you've built, including what it did, the scale it operated at, your specific contributions, and what decisions you made that you're proud of or would revisit today - Your honest assessment of your TypeScript and Node.js depth. We value specifics and self-awareness over a list of buzzwords Links to code, whether GitHub, open source contributions, a portfolio, or anything else that shows us how you think and work We work with companies at inflection points and we hold ourselves and the engineers we bring in to a high standard. If this project sounds like the kind of work you want to do, make that clear in your proposal and tell us why this domain, this stage, and this type of build appeals to you specifically.
- Hourly
- Expert
- Est. time: 3 to 6 months, Less than 30 hrs/week
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.
- Fixed price
- Expert
- Est. budget: $50,000.00
I need an Amazon Expert to manage the backend, add marketing strategies, and address issues as they arise. The role involves optimizing Amazon operations, enhancing marketing efforts, and ensuring smooth issue resolution. Ideal candidates will have experience in Amazon operations and marketing, with strong problem-solving skills. This is an ongoing roll, Not just a project.
- Hourly
- Intermediate
- Est. time: 1 to 3 months, Less than 30 hrs/week
Seeking proven and Node.js development experience to build a production-ready REST API backend that will authenticate to Microsoft Power BI via Azure AD service principal, generate time-limited embed tokens for secure dashboard rendering, and retrieve real-time operational metrics from Power BI datasets using DAX queries. The system will integrate with the Anthropic Claude API using healthcare-specific system prompts, persist all analyses and audit logs in PostgreSQL with immutable compliance tracking, and deploy to Azure App Service with robust error handling, logging, and monitoring. The engagement includes full integration testing and a comprehensive security review prior to launch. ⚠️ All data in the Lovable frontend is currently generated by React components using hardcoded mock objects. There is no backend API, no database persistence, and no real data sources. This is the scope of work for your backend engineer. The primary objective for the data engineer is to deliver a secure, multi-tenant backend, replace all mocked page data with live API responses, embed Power BI dashboards with row-level security, and stand up a Claude-driven analytical agent that operates over a governed semantic model. SUCCESS CRITERIA 1. All 3 endpoints deployed and tested 2. Frontend Dashboard.tsx renders real Power BI embed 3. Frontend AIInsights.tsx displays Claude analysis 4. ActionPlanContext replaced with server-backed CRUD 5. PostgreSQL audit log captures all API calls 6. Security review passed 7. Load test: 50 concurrent users, less than 300ms p95 8. Power BI RLS verified between test orgs 9. Documentation + runbooks delivered 10. Zero unhandled errors in production 11. Launch in mid-June 2026
- Hourly: $20.00 - $60.00
- Expert
- Est. time: More than 6 months, 30+ hrs/week
We're looking for a senior backend engineer to own the server side and cloud infrastructure for a secure healthcare mobile app. This is the person who stands up our AWS environment correctly on day one, moves us off a single VPS, and closes our HIPAA gap. The app serves healthcare field representatives who need secure workflows for managing documents, profile information, status visibility, and access-related functionality. You'll own the API, the cloud migration, and the security foundation the rest of the product depends on. What you'll own: - Backend/API: Python + async FastAPI, PostgreSQL + SQLAlchemy, Redis + background jobs, keeping business logic in the API (thin-client pattern) - AWS/DevOps: migrating off a single VPS to AWS (ECS Fargate, RDS, ElastiCache, S3), infrastructure-as-code (Terraform or CDK), CI/CD, secrets management, observability - A well-architected AWS landing zone with separate non-prod and prod environments (no real customer/PII data in non-prod) - Amazon Bedrock migration so document parsing is HIPAA-covered - Security: secure document handling, auth/session workflows, least-privilege IAM, encryption, audit logging - Building with SOC 2 in mind from day one Must have: - Python with async web frameworks (FastAPI strongly preferred) - PostgreSQL and an ORM with real migration experience (SQLAlchemy a plus) - Hands-on AWS: ECS/Fargate or equivalent, RDS, S3, IAM, Secrets Manager - Infrastructure-as-code (Terraform or CDK) and CI/CD (GitHub Actions) - Security fundamentals: token auth, secrets handling, least-privilege IAM Strongly preferred: - Redis / background job queues - HIPAA or other regulated-data experience (PHI, encryption at rest/in flight, audit logging) - Amazon Bedrock or other LLM-API integration experience - Docker / containerization
- Fixed price
- Intermediate
- Est. budget: $300.00
I need a developer to integrate the TForce Freight "Get Rate" API into an existing web-based freight calculator. The situation: I run a door manufacturing company. I've already built a freight calculator (in Lovable, a web app) that takes a customer's order and outputs the pallet dimensions, weights, and shipping details. That part is done and working. What I need is for those outputs to be sent to the TForce Freight rating API so the tool returns a live freight quote automatically, instead of my employee typing everything into TForce's portal by hand. The specific work: Connect to the TForce Freight Get Rate API (endpoint: POST (link removed)) Implement OAuth 2.0 client-credentials authentication (token fetch + refresh) plus the API subscription key Securely store my API credentials so they are never exposed in the frontend/browser — must be handled server-side or via secure environment variables Map my calculator's existing output (origin zip, destination zip, pallet weight, dimensions, accessorials) to the API's request format Return the freight rate into my app and handle errors gracefully (API down, invalid request, etc.) What's already done: The full calculator and all pallet/weight logic is built and working I have TForce developer portal access and will provide credentials securely (not in this job post) TForce provides API documentation, sample request, and sample response What I'm looking for: Experience with REST API integration and OAuth 2.0 client-credentials flow Backend experience (Node.js or similar) — the secret cannot live in the browser Someone who communicates clearly and asks questions upfront This is a small, well-defined job — a single endpoint with standard auth. I have a detailed spec I'll share with the developer I hire. In your proposal, please tell me: what OAuth grant type does this integration use? (This confirms you read the post.)
- Hourly: $60.00 - $120.00
- Expert
- Est. time: More than 6 months, 30+ hrs/week
Senior Software Engineer (AI-Focused, Contract – US) Position Summary W Energy is seeking a Senior Software Engineer (Contract) to help drive the integration of AI capabilities into our core platform. This role is focused on building AI-powered product features, not just experimenting with models—embedding intelligence directly into workflows across our upstream and midstream solutions. You’ll design and implement AI-driven functionality that improves automation and user experience. This includes leveraging LLMs, machine learning models, and modern AI tooling within a production SaaS environment. This is a hands-on role for someone who can move quickly, make pragmatic decisions, and bring AI concepts into real, scalable product features. Responsibilities • Design and implement AI-powered features within the platform (e.g., automation, recommendations, copilots) • Integrate LLMs and/or ML models into existing services and workflows • Evaluate, select, and optimize AI tools, APIs, and frameworks for production use • Collaborate with Product to translate business problems into AI-driven solutions • Build and maintain scalable backend services to support AI functionality • Profile, test, and optimize performance of AI-integrated systems • Ensure reliability, security, and cost-efficiency of AI components in production • Contribute to architecture decisions around AI integration and system design • Partner with engineering teams to embed AI into existing applications without degrading stability Requirements • 5+ years of experience as a software engineer in a SaaS or cloud-based environment • Strong backend engineering experience (RoR and/or Golang preferred) • Experience integrating APIs and working within distributed systems • Hands-on experience with AI/ML tools (e.g., OpenAI, Anthropic, Hugging Face, or similar) • Experience building or integrating AI-powered features into applications (not just experimentation) • Strong understanding of data flow, system design, and performance optimization • Experience with relational databases (SQL Server or similar) • Familiarity with microservices architecture, Kubernetes, and CI/CD pipelines • Experience deploying applications in Azure or similar cloud environments • Strong problem-solving skills with ability to work in ambiguous, fast-moving environments • Builder mindset—someone who can take an idea and turn it into a working feature quickly • Pragmatic approach to AI (focus on value, not hype) • Ability to work independently in a contract environment while collaborating closely with internal teams • Strong communication skills and ability to explain AI concepts to non-technical stakeholders Preferred • Experience with prompt engineering, embeddings, or retrieval-augmented generation (RAG) • Exposure to model evaluation, fine-tuning, or AI performance monitoring • Experience with event-driven architectures or real-time data processing • Background in energy, fintech, or other complex data-driven industries
- Fixed price
- Expert
- Est. budget: $100.00
We are looking for an experienced Mobile App Developer to help improve, fix, and enhance an existing Android and iOS mobile application. The ideal candidate should have strong experience with Flutter or React Native, mobile app debugging, crash fixing, UI/UX improvements, API integration, Firebase or backend connectivity, push notifications, performance optimization, and app store deployment. Responsibilities: Fix bugs and crashes in the existing mobile app Modify and enhance current app features Improve app performance, speed, and stability Update UI/UX screens where needed Integrate or fix APIs and third-party services Work with Firebase or backend services Test the app on Android and iOS devices Prepare and publish updates to the Google Play Store and Apple App Store. Requirements: Strong experience with Flutter or React Native Experience with Android and iOS app development. Ability to debug and fix crashes efficiently. Experience with API integration and Firebase/backend connectivity. Knowledge of push notifications App testing, bug fixing, and performance optimization skills. Experience publishing apps to Google Play Store and Apple App Store Please include in your proposal: Your portfolio or similar apps you have worked on Your experience with bug fixing and crash resolution Estimated timeline for completing fixes and enhancements Your availability to start We are looking for someone reliable, detail-oriented, and able to deliver clean, stable, and high-quality mobile app updates.
- Fixed price
- Intermediate
- Est. budget: $75.00
Title: Lead Researcher Needed: Find Web Designers and Small Agencies for Technical Hosting Partner Program Job Description: I need a detail-oriented lead researcher to build a targeted list of potential partner businesses. This is a research project only. I am not looking for a sales closer, cold caller, or appointment setter right now. The goal is to find web designers, small design agencies, branding consultants, marketing freelancers, WordPress/Wix/Squarespace designers, and small-business consultants who may need a technical backend partner for client projects. The partner fit: * They work with small businesses. * They may design websites or manage client web projects. * They may not want to handle hosting, DNS, domains, backend development, email DNS, or phone-system/web-system technical coordination themselves. * They may benefit from a backend technical partner. Research focus: Start with Michigan, especially Southeast Michigan. Then expand to the Midwest if needed. Deliverable: A spreadsheet with 50 researched leads. Required columns: * Business Name * Contact Name, if available * Website * Email or Contact URL, if available * Phone, if available * Location * Business Type * Services Offered * Likely Fit Score, 1-5 * Reason for Fit * Possible Partner Model * Personalized Outreach Note * Source URL * Notes Important: Do not scrape blindly. Do not give me random giant agencies. Do not include companies that clearly already provide full managed hosting/backend development as a core service unless there is a strong reason. Each lead should include a short reason why they may be a good fit. Good examples: * independent web designers * small web agencies * branding consultants * local marketing consultants * small-business technology consultants * WordPress/Wix/Squarespace designers * local IT consultants who may not handle web backend work Bad examples: * huge national agencies * generic directories with no useful contact info * companies with no small-business relevance * random SEO spam farms * companies with no clear service match Applicant questions: 1. Have you done lead research for B2B partnerships before? 2. What sources would you use to find these businesses? 3. How would you decide whether a lead is a good fit? 4. How quickly can you deliver 50 researched leads? 5. Please include one sample lead format in your proposal, using a public business of your choice. Budget: Fixed price for the first 50 leads. If the first batch is good, there may be follow-up research work.