Chemical Engineer Projects

opportunity

Clean rebuild of working 3D prototype into production-ready CAD

I’m looking for an experienced CAD engineer or product designer to take my existing 3D design files and rebuild them properly from scratch, ready for production in metal. Background • I designed all parts myself and have already validated the functionality by 3D printing and physical testing • Everything works, but the CAD files are crude and not production-ready • Tolerances are largely guesswork • Parts were developed iteratively by adding and removing features, so many models are a hodgepodge rather than clean parametric designs What I need • Recreate all parts cleanly in a professional CAD system • Apply sensible, engineering-grade tolerances suitable for CNC machining in aluminium • Produce fully constrained, parametric models • Assemble parts where appropriate to check fit and function • Deliver clean STEP (STP) files suitable for manufacture Workflow • I would want to 3D print the rebuilt parts first to validate everything before committing to metal • Expect some iteration after first review/print • I can supply existing STL/STEP files, photos, and functional explanations Ideal candidate • Strong mechanical CAD experience (SolidWorks, Fusion 360, Inventor, Creo, or similar) • Comfortable designing for CNC machining in aluminium • Able to think like an engineer, not just redraw geometry • Experience rebuilding rough prototypes into production-ready designs Please reply with • Brief overview of your relevant experience • CAD software used • Examples of similar “prototype to production” work This is a serious engineering tidy-up rather than a simple file conversion, and I’m looking for someone who enjoys turning working prototypes into elegant, manufacturable designs. Next steps Once I’ve reviewed responses and shortlisted suitable candidates, I will ask for a simple NDA to be signed before sharing any detailed files, drawings, or samples.

opportunity

Engineer to audit Existing CRM Codebase (TypeScript/Node/NeonDB)

Job Description I’m looking for an experienced senior full-stack engineer to review an existing CRM system and provide a clear, structured technical assessment of the current codebase. This is not a build-from-scratch role. The goal is to audit the existing system, review architecture and implementation choices, and highlight risks, concerns, and improvement opportunities across backend, frontend, and data layers. Tech Stack Backend: Node.js, Express, TypeScript Frontend: TypeScript, Tailwind CSS Database: NeonDB (PostgreSQL) System Type: Custom CRM platform Auth: Mix of public and authenticated endpoints Scope of Review You will be asked to review the existing codebase and provide written feedback on: 1. Code Structure & Architecture Project structure and separation of concerns API design and route organization Service, controller, and data access patterns Type safety and TypeScript best practices 2. Backend & API Review Public vs authenticated endpoint design Validation, error handling, and middleware usage Security posture of public endpoints Rate limiting, abuse protection, and access controls 3. Frontend Review Component structure and state management Tailwind usage and maintainability Frontend/backend contract consistency 4. Database & Data Layer Schema design and relationships Query patterns and performance considerations Data access safety (SQL injection, unsafe queries) 5. Security & Reliability Authentication/authorization design IDOR, data exposure, and abuse risks Secrets management and configuration hygiene Logging, monitoring, and error visibility Deliverables A written technical review (bullet-pointed and structured) Clear identification of high-risk, medium-risk, and low-risk concerns Practical, actionable recommendations (no theoretical fluff) Notes on what is good and should remain unchanged No code changes are required unless specifically discussed. Ideal Freelancer 5+ years professional full-stack experience Strong TypeScript + Node.js background Experience reviewing or auditing existing codebases Comfortable with PostgreSQL / NeonDB Strong understanding of API security and CRM-style systems Clear written communication (this is a review role)

Temporary works foundation design and method statement

I have a structural design for strip foundations 1.7m deep near a neighbour's garage structure Currently structural engineer has proposed hit and miss foundations but would like someone to design and propose temporary works instead like plywood shoring as alternate for building control

Mobile App Developer

ABOUT THE ROLE We are building a mobile app that merges private asset portfolio management with exclusive, automated community features. We have a functioning prototype in Lovable, but need to make it a mobile app and will need ongoing development here. We need a Moblie developer with experience using AI-tools (Cursor, etc) to take our current technical foundation and turn it into a world-class consumer experience. This starts as a contract role with a clear path to becoming a core member of the engineering team as we scale. THE PROJECT You’ll be working directly with our founding engineer to stabilize our backend, implement complex data integrations, and polish the mobile UX for an upcoming launch. - Portfolio Management: A utility where users track real-time asset values, 5-year forecasts, and ownership cost curves. - Automated Communities: A subscription-based social layer that auto-places users into niche groups based on their portfolio data and location. TECH STACK - Framework: Flutter or React Native (open for suggestions) - Backend/Data: Supabase - Tools: AI-assisted development (Cursor, etc.) for rapid iteration WHAT WE’RE LOOKING FOR - Required: - Experience shipping high-quality apps. - Ability to work with data-heavy interfaces (charts, trends, forecasts). - Experience with AI-assisted development (Cursor, etc.) to move fast and maintain high output. - High ownership: you can handle ambiguity and ship reliable code independently. - Nice to Have: - Previous experience building social features (feeds, real-time updates). WHAT WE OFFER - Starting Out: - Hourly rate based on experience. - Flexible, fully remote hours. - Direct collaboration with the founding team. - Growth Path: - The opportunity to join as a core early engineer post-raise. - Potential for equity as the team scales. - Ownership over a platform with a roadmap to hundreds of thousands of users. HOW TO APPLY Send us: - Portfolio and links to relevant Mobile App work. - Your experience with AI coding tools. - Hourly rate expectation - When you can start - Weekly availability for the next 1–2 months. - Bonus: A link to a GitHub profile or live mobile projects you’ve contributed to.

STAR-CCM+ + TAITherm Cabin HVAC Thermal Comfort Debug/Fix

Automotive Cabin Heating Thermal Comfort Simulation Fix (STAR-CCM+ .sim + TAITherm Human Thermal / Berkeley Comfort) We are looking for an engineer who can run and troubleshoot an automotive cabin heating thermal comfort simulation using: - Simcenter STAR-CCM+ (.sim) for cabin airflow/temperature fields - TAITherm Human Thermal / HTE + Berkeley Comfort for occupant comfort outputs Task goal (what you need to deliver) We have a simplified cabin model. Under a cold ambient heating scenario, the current results are abnormal: occupant thermal sensation/comfort improves briefly and then becomes colder again (e.g., TS drops toward -1 and continues decreasing). We need you to diagnose the root cause and correct the model setup/coupling/mapping so the outputs are physically reasonable. Target requirements (high level): - Transient duration: 1800 s (30 min) - Monitoring temperatures: foot/foot-vent zone around ~35°C, head point around ~20°C (exact monitor definitions will be shared privately) - Comfort trend: overall thermal sensation & comfort must be normal/stable (after heating ramps up, it should not “get colder again”) What we expect from you - Identify why comfort trend becomes colder (typical causes include MRT/radiation boundary, incorrect field-to-human mapping of Ta/Tr/velocity/RH, initialization/restart issues, boundary leakage on cut surfaces, etc.) - Provide corrected settings + clear explanation of what was wrong and what you changed - Provide plots/outputs for monitoring temperatures + comfort metrics (TS/PMV/PPD or equivalent) Required experience (please do NOT apply if you don’t have this) - Hands-on experience with STAR-CCM+ transient cabin HVAC/thermal - Hands-on experience with TAITherm Human Thermal / Berkeley Comfort (not only CFD) - Ability to actually run the case (access to software/licenses or a workable setup) Confidentiality Due to confidentiality, we will share the detailed model files and full requirement document after you confirm capability. Please answer these in your proposal: 1) Have you used TAITherm Human Thermal / HTE + Berkeley Comfort in real projects? Share 1–2 lines of what you did (no confidential details). 2) Do you have access to STAR-CCM+ and TAITherm comfort/human modules to run the model? (Yes/No) 3) List your top 3 likely causes when cabin heating comfort “gets colder again” (keywords are fine: MRT/radiation, mapping, restart/initialization, boundary condition, cut-surface leakage, etc.) 4) What is your estimated time (days) to deliver corrected results + explanation? 5）Tell me how much you would charge for my task. —————————— Keywords: STAR-CCM+ .sim, Simcenter, cabin HVAC heating, automotive thermal management, TAITherm 2020, ThermAnalytics, Human Thermal Model, Human Modeling Extension (HTE), Berkeley Comfort Model, thermal sensation (TS), PMV, PPD, MRT (mean radiant temperature), radiation boundary, coupling/mapping, transient 1800s, monitoring points, HDF5 .tdf, .vfs .slf .tlf - Simcenter STAR-CCM+ (Transient / CHT / Radiation) - TAITherm / RadTherm (Human Thermal / HTE) - Thermal Comfort / Berkeley Comfort / PMV-PPD - Automotive HVAC / Cabin Thermal Management - CFD Post-processing / Data analysis (HDF5)

Flutter app - repost 2 due to christmas

ENGAGEMENT TYPE Hourly (Time & Materials) Estimated effort: 22–26 hours total Start: Immediate Level required: Senior / Very Senior Flutter Developer ONLY WHAT THIS JOB IS (READ CAREFULLY) This is a small, precise repair task in an existing Flutter app. There is no greenfield work involved. There will be: No new features No refactors No architecture changes No redesigns No experiments No “suggested improvements” No “I found another bug” unless it can be reproduced locally You are fixing known, clearly scoped issues only. IMPORTANT BACKEND & API CONTEXT (NON-NEGOTIABLE) All APIs and server-side code have been working as late as December 2025. A full Postman collection exists and can be executed at any time to verify API functionality. The backend is Magento 2.4. No backend work is required. No Magento developer work is required. Stripe APIs are live and working. This task is Flutter-only. Any attempt to reframe this as a backend, API, or Magento issue is incorrect. REQUIRED SKILL LEVEL (MANDATORY) You must be: A Senior or Very Senior Flutter developer Comfortable fixing Stripe and Apple Pay issues in production apps Able to read existing code and fix it without rewriting it Able to work independently without supervision If you are not senior, do not apply. NON-NEGOTIABLE ENGINEERING RULE Never update Flutter, packages, or plugins before the existing code is confirmed working. This is a basic rule, yet one that many so-called “senior” developers still get wrong. IMPORTANT CONTEXT (PLEASE READ) The app already compiles. A previous developer requested payment before automated tests were run. That is not acceptable under PPH standards. Testing comes first. Payment comes after. For this reason, the previous contract was terminated. This is shared for clarity so expectations are fully aligned. APPLICATION FILTERS (STRICT) If you present web pages as Flutter references, you are not of interest. If you have no verifiable references, you are not of interest. If you describe yourself as a “full-stack developer”, you are not of interest. If you over-explain, bloat, or try to over-engineer, you are not of interest. I am looking for a specialist, not someone who knows a little about everything. This is a razor-sharp task. Change existing code. Nothing more.

Freelance Video Editor (Minimum 40 Hours p/m) - Podcast Editing

Company Description: We're a thriving podcast production company based in the vibrant Shoreditch area of London, a 5 minute walk away from Liverpool Street Station. Our state-of-the-art studio spaces serve as a creative hub for podcasters to bring their ideas to life. Our team is passionate about creating top-notch podcast content and helping businesses succeed through effective podcast marketing. We're seeking a versatile individual to join our team as a Junior Studio Assistant and Video Engineer, who will play a pivotal role in ensuring smooth studio operations and supporting the delivery of high-quality video content for our podcast clients. We're just expanded! And after the successful launch of our first location in July 2024, we're expanding to a second location 3 minutes around the corner with 4 brand new studios, a make-up/changing area and lots more. A true hub for podcast creators, and with that, we're looking to grow the team to help with that expansion. We are looking for an experienced Freelance Video Editor to support our growing podcast and video production output. This role is primarily focused on long-form podcast video edits, working closely with our production manager and wider Podshop team to deliver high-quality content under strict turnaround times. This is a contracted position with a minimum commitment of 40 hours per month, with workloads expected to increase over time — likely exceeding 100+ hours per month as we scale. We are also planning to open an additional studio later in the year, creating further opportunities for ongoing work. Key Responsibilities Video Editing & Post-Production - Edit primarily long-form podcast video content to a high standard. - Deliver clean, consistent edits that align with brand and client expectations. - Apply efficient workflows to meet tight deadlines without compromising quality. - Minimal audio work required, as audio post-production is handled by a separate team. Turnaround & Workflow - Deliver first draft edits within 72 hours of recording. - Complete client amendments within 48 hours of receiving feedback. - Manage multiple projects concurrently while maintaining deadlines. Collaboration & Communication - Work closely with the Production Manager and Podshop team on a day-to-day basis. - Occasionally liaise directly with clients when required. - Maintain clear communication around progress, delivery times, and any issues. Working Hours & Availability - Majority of work falls Monday to Friday, though occasional weekend work may be required. - Flexible working hours — editors can work at times that suit them (e.g. starting later in the day), provided deadlines are met. - This role is fully remote. Required Experience, Skills & Equipment - Strong, demonstrable experience in professional video editing. - Solid understanding of podcast editing workflows. - High level of efficiency, speed, and attention to detail. - Confident working under strict turnaround times. Equipment & Technical Requirements - Adobe Premiere Pro (essential). - High-spec editing PC capable of handling up to 6 channels of 4K video. - High-speed internet connection — minimum 1GB/s upload and download for large file transfers. Location Requirements - Ideally based in the UK, or within a similar timezone. - Timezone flexibility of ±2 hours from BST is acceptable. Test Edit & Start Date - Shortlisted candidates will be required to complete a paid test edit. - The test edit will be paid at the advertised hourly rate, whether successful or not. - The edit will not be an active client project (it will be an episode already approved by a client). - For successful candidates, we are looking for an immediate start. Pay & Contract Details Rate: £20–£30 per hour, depending on experience Contract Type: Freelance / Contractor Hours: Minimum 40 hours per month, with workload expected to grow to 100+ hours per month over time Rates for the paid test edit will be aligned with the same hourly rate band. Although this is a contractor role, UK-based freelancers are invited to our annual Christmas party, bringing the wider UK team together in person.