Frontend / Backend разработчик

I am looking for an experienced developer or a small team to create the ENGoose website - an online platform with ready-made ESL materials for English language teachers. This should not be an ordinary informational site or landing page, but a convenient library of educational materials with a paid subscription, personal accounts, and the possibility of further development. Currently, I am prioritizing WordPress, but I am open to considering Bubble or another well-argued technical solution. Main functionality A modern responsive website for computers, tablets, and smartphones. A catalog of ESL materials with cards and separate lesson pages. Filters by levels, topics, types of materials, grammar, and other parameters. Search and sorting of materials. Free and paid materials. Monthly subscription. Integration of a payment system compatible with Ukrainian individual entrepreneurs. Registration, login, and personal account. Adding materials to favorites. Protected access to PDF files and Canva links. Administrative panel for self-adding and editing materials. Main informational pages: FAQ, pricing, contacts, terms of use, and privacy policy. Timer until the next material is released. Possibility of further expanding functionality. Additional features Please separately evaluate the possibility and cost of: private notes and personal tags for lessons; a simple planner: date, time, student name, and status "scheduled/conducted". In your proposal, please indicate: recommended platform and its advantages; examples of similar projects; estimated cost and timelines; what is included in the proposed amount; monthly and annual expenses after launch; terms of further support.

We are looking for an experienced WordPress security specialist to help migrate an existing website to Cloudways, clean up malware/backdoors, and harden the website against future attacks. The project includes website migration, malware removal, security configuration (Wordfence, Cloudflare, 2FA), investigation of the infection source, and updating the website to eliminate any remaining vulnerabilities. A detailed technical specification will be shared privately with shortlisted candidates. Please include in your proposal: - Your experience with WordPress malware cleanup and website security. - Your hourly rate. - Your estimated availability. I don't expect fixed price estimation for the project, because cleaning viruses it unpredictable. - Any experience using AI tools (Codex, Claude Code, Cursor, etc.) for code analysis and security work.

About the project and tasks We have a small sales department (sales department head + 2 managers) and a database of about 220 active clients. There is an urgent need to implement a simple CRM as an operational level so that managers can record calls, agreements, and statuses in the sales funnel in real-time, while management can see which clients are "stuck" at a certain stage. At the same time, we actively use AI analytics (Claude) for working with exports, reports, anomaly detection, and P&L analysis. Therefore, the CRM is needed as a clean data source from which quality exports can be generated. What needs to be done (Stage 1 — Implementation) Audit and solution selection. Finally determine the platform together with us. We are considering Ukrainian solutions (KeyCRM or SalesDrive) as integration with Ukrainian telephony and Nova Poshta is important. We are also open to considering Pipedrive. System setup. Creating a sales funnel, client cards, and configuring fields according to our specifics. Integrations. Connecting telephony, messengers, and Nova Poshta. Data import. Correct transfer of the existing client base (about 220 contacts) from current files. Training. A brief briefing for the sales department head and two managers on the rules for managing deals to ensure data cleanliness and quality in the CRM. Further tasks (Stage 2 — Support) Technical support and refinement of automations during the work process. Monitoring the correctness of data exports for further AI analytics. Who we are looking for A specialist with experience in implementing KeyCRM, SalesDrive, or Pipedrive (please include examples or cases in your response). A person who understands the principles of building sales analytics and can configure data exports without "garbage". A responsible specialist ready for long-term cooperation and project support. In your response, please indicate Your experience with KeyCRM, SalesDrive, or Pipedrive. Estimated cost and time for basic setup for our team (3 users). Whether you are ready to further administer the system and under what conditions.

A business website needs to be developed with several pages (about 5 typical ones). The main page will have around 11 blocks. The niche is "Modular Houses." The work includes: selecting a template deploying and configuring adjusting the necessary blocks and pages (there is currently a rough structure) adding all necessary content considering recommendations from the SEO specialist and contextual marketer The result should be a website ready to launch in advertising. Essentially, this is the work of a web developer + content creator. The performer should be sufficiently proactive, technically skilled, and not just a doer but also a thinker on the project – proposing better solutions along the way, thinking in terms of business results rather than just tasks to be completed. The task is not complicated, and there are no special design requirements. Overall, it should result in a fairly simple yet stylish website. Separately, a rate per hour for content work is needed, as we will further populate the service pages and add articles to the blog. A performer is needed who can handle similar projects on a regular basis. Usually, such tasks come with a request like "I need a small, inexpensive website based on a template" – I think everyone has encountered such clients: the business owner does not have much knowledge about websites and needs to be offered an optimal solution.

We are looking for an experienced Embedded developer to create energy-efficient firmware for a wearable device (form factor: chest strap) for monitoring psychophysiological state. The circuit design is complete, and development will be based on a development kit with subsequent transfer to a custom board.Stack and hardware base:MCU: Nordic Semiconductor nRF52840 or nRF5340.Development environment: nRF Connect SDK / Zephyr RTOS (strictly C/C++).Peripherals:Optical pulse sensor (PPG) — operates via I2C.6-axis inertial sensor (IMU accelerometer + gyroscope) — operates via SPI.Haptic motor driver (LRA 1030) — controlled via PWM.External SPI Flash memory for cyclic logging.Work scope by stagesStage 1: Bring-up, peripheral drivers, and BLE telemetryGoal: Bring the hardware to life, set up stable data collection, and transmit it to a smartphone/PC.Configure I2C and SPI buses using DMA (Direct Memory Access) to offload the processor.Write/integrate drivers for PPG and IMU (configure polling frequency, sensor FIFO buffers).Deploy a custom BLE profile (GATT service) for real-time transmission of raw data from sensors.Basic initialization of PWM for controlling the haptic LRA motor (launch test vibration patterns).Stage 2: Algorithmic layer (DSP and multi-level feedback logic)Goal: Implement mathematical signal processing directly on the chip (Edge Computing) and device reaction logic.Implement algorithms for filtering motion artifacts: clean the PPG signal using accelerometer data (IMU).Extract R-R intervals (HRV) from the cleaned PPG signal.Implement 4-level system stability logic:Drift Level: Track gradual changes in HRV and breathing.Prediction Level: Calculate a mathematical trend for deterioration.Micro-correction Level: Generate barely noticeable haptic patterns on the LRA motor when a target data pattern is detected.Hardware Reset Level: Implement safety logic (high-intensity haptic pulse at critical metrics).Stage 3: Energy saving, logging, and fault toleranceGoal: Prepare the device for autonomous operation from a miniature battery and ensure "24/7" stability.Deep optimization of energy consumption. Put the MCU into sleep mode (System ON/OFF) between measurement cycles. The processor should wake up only on interrupts from sensor FIFO buffers or a timer.Write a fault-tolerant file system in external SPI Flash (e.g., LittleFS) for autonomous cyclic log saving.Configure a hardware watchdog timer to prevent firmware hangs.Requirements for the performer:Experience in commercial development for Nordic chips (nRF52/nRF53) of at least 3 years.Proficient in Zephyr RTOS and debugging tools (Segger Embedded Studio / VS Code, J-Link).Understanding of digital signal filtering principles (DSP) and low-power design.Having your own debugging kit (nRF52840-DK or similar) for starting work is welcome.Work format:Milestone payments with results documented on GitHub. Please indicate your hourly rate or approximate cost and timeline estimates for each of the three stages.