Retainers, Sprints & Fixed Scope

Retained engineering support for serious technical delivery.

HNES / Norelith is built for clients who need one capable engineering partner across software, electronics, firmware, mechanical design, robotics, automation, AI, and product integration. Retainers are the preferred route for ongoing or evolving work. Fixed-price projects are still available when the scope is short, specific, and locked.

Best for premium builds

End-to-end or hybrid projects where hardware, software, CAD, firmware, AI, dashboards, or control systems need to work together.

Still open to focused work

PCB revisions, firmware debugging, CAD packs, web dashboards, AI features, audits, rescue work, and scoped specialist tasks.

Primary route

Monthly engineering retainers

Reserved engineering access for clients who need dependable technical ownership, regular progress, and practical delivery capacity. Each month has agreed priorities, a capped allocation, and clear boundaries. These are not unlimited development agreements.

Aftercare

Post-Delivery Support

Past clients who need light aftercare, clarification, triage, and support after delivery.

USD 950/month

Up to 14 hours/month

  • Questions about delivered files, code, CAD, PCB, firmware, documentation, or system behaviour
  • Light review of screenshots, logs, test results, photos, videos, or supplier questions
  • Guidance on whether an issue is support, a separate fix, or a larger new phase
Discuss this option
Support

Engineering Support Retainer

Regular engineering input, reviews, debugging, small fixes, technical planning, and handover support.

USD 3,000/month

Up to 43 hours/month

  • Design reviews, debugging support, feasibility advice, and technical decision-making
  • Small fixes, documentation updates, supplier support, and contractor/internal team review
  • A strong fit when you need senior engineering input without a full monthly build stream
Discuss this option
BuildCore offer

Build Retainer

Active monthly engineering development across software, firmware, PCB, CAD, prototyping, and integration.

USD 7,500/month

Up to 107 hours/month

  • Weekly progress updates, agreed monthly priorities, and handover-ready engineering outputs
  • Firmware, software, PCB, electronics, CAD, mechanical, prototype, robotics, or controls work
  • Ideal when the project needs reliable external engineering capacity without hiring full-time staff
Discuss this option
Priority

Priority Development Sprint

Urgent builds, project rescue, MVPs, demos, investor preparation, or high-priority delivery.

USD 16,000/month

Up to 229 combined team-hours/month

  • Fast multi-discipline engineering push with coordinated specialist input where needed
  • Prototype rescue, urgent debugging, MVP/demo readiness, and high-priority technical ownership
  • Best when speed, coordination, and delivery confidence matter more than the lowest monthly cost
Discuss this option

How the monthly plans work

Included time is a monthly cap, not an open-ended commitment. For team-based work, time can be distributed across the relevant specialists: firmware, PCB, CAD/mechanical, software, testing, technical coordination, or documentation. Work beyond the agreed cap or outside the monthly priorities is quoted or billed separately before proceeding.

When scope is unclear

Blueprint and audit sprints

If the brief is risky, incomplete, inherited, or technically uncertain, a paid sprint is the safest first move. It creates the plan, evidence, and scope boundaries needed before starting a retainer or fixed-price build.

Selective fixed price

Fixed-price work is still available for locked scopes

Fixed-price packages are best for short, well-defined outputs: a website build, app prototype, PCB/firmware revision, or CAD/DFM pack with a clear deliverable list. If requirements are still moving, we will recommend a sprint or retainer first.

Fixed price works when scope, inputs, exclusions, timeline, and acceptance criteria are agreed before build starts.

Lead fit

Two kinds of work we actively support

The strongest fit is multidisciplinary product delivery, but we also take focused specialist work when it matches our engineering depth and can create a useful long-term relationship.

Premium / higher-value jobs

One engineering partner across multiple domains.

This is where we are most differentiated against single-discipline freelancers and narrow agencies: projects where electronics, firmware, software, mechanical design, AI, controls, and integration need to move together.

  • End-to-end product development
  • Concept to prototype
  • Prototype to production
  • Integrated hardware + software builds
  • Custom devices and IoT products
  • Robotics and mechatronics systems
  • Mechanical + electronics + firmware projects
  • PCB + firmware + enclosure builds
  • Dashboards, apps, and backends tied to hardware
  • AI-enabled technical products
  • Technical audits and blueprint/scoping sprints
  • Volume / conversion jobs

    Focused work, done properly.

    We also support narrower jobs when the task is technical, bounded, and useful: debug the board, revise the enclosure, build the dashboard, integrate the model, rescue the repo, or prepare the handover pack.

    • Debugging, audit, rescue, revision, and handover work
    • Single-skill tasks that can grow into repeat work
    • Specialist delivery without pretending every job needs a huge programme
    • A practical entry point for clients who may later need a retainer
    Coverage

    What we can cover

    From technical websites to electronics bring-up, from firmware to CAD, from robotics to AI-enabled products, the value is in joining disciplines without losing clarity.

    Mechanical / CAD

    Mechanical designProduct designCAD modellingSolidWorksFusion 360EnclosuresMechanismsDFM / DFABOMs and drawings

    PCB / electronics

    PCB designSchematic captureBoard revisionCircuit designPCB layoutHardware bring-upElectronics debuggingSensor boardsManufacturing packs

    Embedded / firmware

    ESP32STM32ArduinoRP2040ESP-IDFFreeRTOSBLE / BluetoothWi-Fi / LoRaOTA / provisioningMotor control

    Robotics / controls

    RoboticsMechatronicsAutomationROS / ROS2GazeboSensor fusionControl systemsPIDMATLABSimulink

    Software / web / app

    Web developmentTechnical websitesDashboardsInternal toolsPortalsAPIsBackend systemsMobile appsSaaS MVPs

    AI / data / training

    AI/MLAI featuresComputer visionOpenCVYOLOLLM integrationRAGAnalyticsData pipelinesModel evaluationDataset curation
    Decision guide

    How to choose

    Use this as a simple starting point. If you are unsure, book a call and we will recommend the least risky route.

    01

    Ongoing or evolving work

    Choose a monthly retainer when you need active engineering support, development, or technical ownership.

    Book a retainer call
    02

    Unclear, inherited, or risky

    Start with a Blueprint or Technical Audit Sprint before committing to build budget.

    View sprints
    03

    Short locked scope

    Use fixed price only when the scope, deliverables, inputs, and acceptance criteria are tightly defined.

    Request an estimate

    Fit Check: What we support

    HNES focuses on practical engineering delivery across software, electronics, firmware, CAD/mechanical, robotics, controls, automation, AI, prototyping, and integrated product development.

    Supported

    • Websites, web apps, dashboards, portals, APIs, mobile apps, and companion/control interfaces
    • PCB design, electronics debugging, embedded firmware, microcontrollers, IoT, telemetry, and sensor integration
    • CAD, mechanical engineering, enclosures, mechanisms, DFM/DFA, prototyping, and MVP development
    • Robotics, mechatronics, automation, controls, simulation, computer vision, and AI-enabled product features
    • Technical AI training support, model evaluation, dataset curation, audits, rescue work, revision, and handover

    Not supported

    • xCivil engineering and structural building design
    • xMedical devices or regulated healthcare products requiring specialist regulatory ownership
    • xManned aviation, aerospace certification, or formal compliance programmes we have not explicitly scoped
    • xUnlimited development, guaranteed certification outcomes, or undefined work without agreed priorities

    Let's Talk

    Ready to build your prototype?

    Tell us about your idea and we'll help you plan the fastest path to a working prototype.

    5-min response
    📋Scope-first
    📦Documented handover
    🔒NDA available