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Senior team, no handoffs
The people who scope your program are the people who execute it. Multidisciplinary by default.
Engineering and design for hardware in growth mode
We build products that have to work.
Spring is a senior engineering and design consulting team for medical device, climate, robotics, and consumer hardware companies. We bridge prototype and production with the rigor, speed, and commercial judgment your program needs.
Trusted by founders and product teams at
About Spring
An engineering team built for the hard part.
Most prototypes do not become products. The reasons are familiar: shifting requirements, gaps between disciplines, a manufacturing reality that was never designed for, a team that ran out of attention before the program ran out of risk. Spring exists to close that gap. We pair senior engineers and designers with the commercial judgment to know which decisions matter, then we make them with you.
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Commercial judgment
Every engineering decision is made with manufacturability, regulatory path, and unit economics in view.
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Fixed price, fixed scope
Milestone-based commercial structure. Predictable cost, aligned incentives, no billable-hour drift.
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AI-native operations
Internal tooling that compresses cycle time on concepting, documentation, and analysis without cutting rigor.
Where we work
Agility for Tough Technology Markets
Spring focuses where engineering rigor and commercial pressure meet. We engage in four verticals and bring shared muscle to all of them: systems thinking, design for manufacturability, and a bias toward shipping.
01 · Medical
Medical device and biotech
Class II Devices, Drug Delivery, Diagnostics, and Biomanufacturing.
Concept-to-feasibility
Design for usability and human factors
Regulatory-aware system architecture
Integration with biologics and fluidics
02 · Climate
Climate and energy
Energy storage, emissions capture, and sustainable industrial hardware.
Demonstrator scale-up
Instrumentation and controls
Field-ready ruggedization
Cost and power optimization
03 · Robotics
Industrial robotics and automation
Mechatronics, instrumentation, and high-throughput systems.
System architecture
Motion and sensing integration
Design for reliability at scale
Production documentation
04 · Consumer
Consumer hardware
Connected products, wellness, household, and family-focused devices.
Industrial design
Brand-aligned product language
Mechanism design
DFM and tooling readiness
Capabilities
A Multidisciplinary Approach.
Mechanical, electrical, software, and industrial design, supported by an in-house prototyping shop and a structured product strategy practice. One accountable team across the program.
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Mechanical engineering
Mechanism design
Modeling and simulation (FEA, CFD)
Prototyping and test
Design for manufacturability
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Electrical engineering
Circuit design and PCB layout
Low-power systems
Signal acquisition and processing
Power and battery integration
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Software and firmware
Embedded firmware and control systems
Data acquisition and monitoring
System integration and APIs
Operator interfaces
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Industrial design and UX
Form and brand language
Concept ideation and validation
User interface design
Human factors and usability
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Product strategy
Go-to-market planning
Competitive teardown and assessment
Roadmapping and gate planning
Brand and product analysis
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Prototyping and small build
3D printing (SLA, FDM, SLS)
Machine shop fabrication
Sourcing, inspection, assembly
Validation and pilot builds
Mechanical engineering
Mechanism design
Modeling and simulation (FEA, CFD)
Prototyping and test
Design for manufacturability
Electrical engineering
Circuit design and PCB layout
Low-power systems
Signal acquisition and processing
Power and battery integration
Software and firmware
Embedded firmware and control systems
Data acquisition and monitoring
System integration and APIs
Operator interfaces
Industrial design and UX
Form and brand language
Concept ideation and validation
User interface design
Human factors and usability
Product strategy
Go-to-market planning
Competitive teardown and assessment
Roadmapping and gate planning
Brand and product analysis
Prototyping and small build
3D printing (SLA, FDM, SLS)
Machine shop fabrication
Sourcing, inspection, assembly
Validation and pilot builds
Selected work
Programs we've helped move.
A selection of recent and representative engagements. Each one shipped, scaled, or unlocked the next stage of capital.
Medical device and biotech
Implant Charging Platform.
Challenge
Manage heat and mechanical integration in a high-frequency inductive charging system for implantable medical devices.
Approach
Spring developed mechanical system architecture, thermal models, and heat-management concepts to support safe, compact, and testable device integration.
Outcome
The platform advanced toward animal testing with a clearer thermal strategy and mechanical architecture for the next stage of development.
Medical device and biotech
Adaptive prosthetic socket.
Challenge
A mechanically adaptive prosthetic socket required reliable tensioning, intuitive use, and clinician-ready adjustment workflows.
Approach
Spring optimized the mechanical architecture, tensioning path, and user interaction model to improve fit management for users and clinicians.
Outcome
The work introduced new workflow concepts and informed the next iteration of the adaptive prosthetic product line.
Medical device and biotech
Protein manufacturing platform.
Challenge
A novel perfusion bioreactor required reliable sealing, repeatable assembly, and robust operation across complex fluidic interfaces.
Approach
Spring optimized assembly architecture, sealing features, and manufacturability details to improve usability and reduce build variability.
Outcome
The platform gained a more robust assembly path for continuous protein manufacturing and future scale-up.
How we engage
Three ways to work with us.
Most engagements fall into one of three shapes. All three are scoped on fixed-price milestones, with a clear definition of done at each gate. Time and materials is available where the work warrants it.
Spring for Startups
Best for
Seed and Series A hardware teams moving from prototype to commercial product.
Typical shape
Assumption validation with AI-enabled concepting and prototyping
DFx for manufacturability, supply chain, and compliance
Competitive teardowns and market landscape validation
Roadmap support across 18+ months of productization
Spring for Corporate Innovators
Best for
Product organizations with limited bandwidth and high-priority initiatives that need execution.
Typical shape
Accelerate new category exploration without draining core resources
Execute performance-critical redesigns
Develop internal test systems
Provide integrated design, engineering, and strategy support at key gates
Spring as Embedded Partner
Best for
Founders or product leaders who need a long-running, multi-disciplinary partner across a program.
Typical shape
Multi-quarter engagement with a dedicated cross-functional pod
Shared planning cadence
Optional shared upside structure tied to in-market milestones
Fixed price, fixed scope, by milestone. We take on the risk of execution. Where it is in your interest, we will structure shared upside on in-market success metrics. Time and materials is available for true discovery work.
The team
Senior practitioners, doing the work.
Spring is built around a small senior team based in New Haven and Boston. The people who scope your program are the people who execute it. We have led product launches, built test fixtures, run regulatory submissions, taken designs to mass production, and watched products survive their first year in the field.
Our team brings experience from both ends of the spectrum: large organizations where rigor was non-negotiable, and early-stage ventures where survival depended on knowing what to build next. That combination shapes how we work and the judgment we bring to the table.
In Profile
- Based in New Haven, with a Boston presence
- Prior experience at large organizations and venture-backed hardware startups across medical device, climate, robotics, and consumer
- In-house prototyping shop: 3D printing, machine shop, electronics bench, fabrication in metal, wood, and plastics
- Sourcing, inspection, assembly, and test for validation builds
Why Spring
Most teams can build prototypes. Few can build viable, scalable products.
Spring bridges strategy and execution with the urgency and precision your program needs. Here is how we compare to the two alternatives most teams weigh.
| Internal team | Other firms | Spring | |
|---|---|---|---|
| Development speed | Competing priorities slow momentum. | Process-heavy, slow to adapt. | Fixed-price sprints with a senior team focused on the program. |
| Total cost to execute | Hidden cost of delays and restarts. | Billable-hour bloat with limited accountability. | Predictable, milestone-based pricing. Estimation risk on us. |
| Prototype to production | Gaps in DFM, compliance, and vendor management. | Disconnected handoffs across teams. | Integrated design, engineering, and manufacturing thinking from day one. |
| Commercial fit | Risk of building what can be built, not what should be. | Engineering-first; go-to-market bolted on later. | Built with margin, manufacturability, and market reality in mind. |
Let's talk
Your program deserves the right partner.
Whether you have a complete spec or the early shape of an idea, we'd like to hear about it. Thirty minutes, no sales pitch, just a thoughtful conversation about what you're trying to build.
01 · Startups
You have a working prototype and need a credible team to take it to product.
02 · Corporate
You have a corporate program that needs senior horsepower this quarter.
03 · Investor
You are an investor who wants a hardware-fluent partner for portfolio teams.
Thanks. We'll be in touch.
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