LiquidPiston, Inc.

Design Engineer Internship-LiquidPiston: Multiple Openings Available Location: This role is fully onsite in Bloomfield, CT, five days per week. The company will be relocating to Suffield, CT later in 2026. (relocation assistance not available) Employment Type: Full-time Internship (Fall 2026) Compensation: Paid About LiquidPiston: LiquidPiston is a fast-growing propulsion technology company reinventing the internal combustion engine with our patented X-Engine rotary architecture and High Efficiency Hybrid Cycle (HEHC). Our engines deliver dramatically higher power density, efficiency, fuel flexibility, and compactness than traditional piston designs - making them ideal for UAVs, defense systems, hybrid-electric propulsion, portable power, and aerospace applications. We're transitioning from pure R&D to industrialization and commercialization, creating exciting opportunities to impact real product development in a small, high-energy team. Internship Overview:...

Genset Mechanical Integration Engineer - LiquidPiston Location: This position is fully onsite in Bloomfield, CT, five days per week, with the company relocating to Suffield, CT later in 2026. Position Summary: LiquidPiston is seeking a Genset Mechanical Integration Engineer to lead the mechanical integration and packaging of electrical and electromechanical systems within our next-generation rotary engine-powered generator platforms. This role is ideal for a mechanical engineer with experience designing around electrical hardware, including packaging high-voltage or low-voltage electrical components, power electronics, wiring, harness routing, battery systems, and electromechanical assemblies. You'll own the mechanical integration of these systems into compact, high-performance engine and generator packages while balancing manufacturability, serviceability, thermal management, vibration, and overall system performance. You'll work closely with Mechanical, Electrical, Controls,...

Senior Power Electronics Engineer - LiquidPiston This role is fully onsite in Bloomfield, CT, five days per week. The company will be relocating to Suffield, CT later in 2026. About LiquidPiston LiquidPiston is revolutionizing combustion engine technology through the development of advanced rotary engines and integrated hybrid power systems. Our innovative designs aim to dramatically improve efficiency, reduce size and weight, and enable cleaner, more compact power solutions across defense, aerospace, and commercial sectors. Position Overview This role is ideal for someone who enjoys owning hardware from concept through production. While power electronics is a major part of the job, this is not a narrowly scoped "design one converter for a year" role. The right candidate is excited by the broader challenge of building reliable, high-performance products in a small-company environment where priorities evolve quickly and engineers wear multiple hats. Key Responsibilities...

About LiquidPiston LiquidPiston (LPI) is revolutionizing the internal combustion engine. Our patented High Efficiency Hybrid Cycle (HEHC) and rotary X-engine platform enable compact, ultra-efficient, and power-dense engines for hybrid, aerospace, and power generation applications. We are a mission-driven team of innovators determined to push the boundaries of energy and propulsion. Position Overview We are seeking talented and motivated Engine Design Engineers to join our growing team. In this role, you will be at the forefront of developing groundbreaking engine systems and components-from initial concept through prototyping, validation, and production. You will collaborate with cross-functional teams to design, analyze, and optimize high-performance subsystems with a focus on efficiency, weight, durability, manufacturability, and cost-effectiveness.Key Responsibilities Collaborate with multidisciplinary teams to define system and component-level requirements aligned...

Chief Engineer Location: Bloomfield, CT (Fully onsite - no remote option) About LiquidPiston LiquidPiston (LPI) is reinventing the internal combustion engine. Our patented rotary X-engine platform enables ultra-efficient, compact, and power-dense engines with applications across aerospace, defense, commercial, and mobility sectors. We're building the future of propulsion-and we're looking for visionary leaders to join us on this journey. Position Overview As Chief Engineer, you will be at the forefront of bringing LPI's revolutionary High Efficiency Hybrid Cycle (HEHC) rotary engine to market. Collaborating closely with company leadership, cross-functional engineering teams, and external partners, you will lead the technical execution of a major engine development program from prototype to production. This is a hands-on, lab-centered role for an experienced, strategic, and inventive engineering leader who thrives in an R&D environment. Key Responsibilities:...

Mechanical Engineer Location: Onsite in Bloomfield, CT About LiquidPiston: LiquidPiston, Inc. is developing the next generation of compact, high-efficiency rotary engines based on its patented thermodynamic cycle. Our engines are being designed to transform power generation and propulsion across aerospace, defense, and commercial industries. We offer a fast-paced, hands-on R&D environment where mechanical engineers have a direct impact on shaping breakthrough technologies. Position Overview: We are seeking a hands-on, innovative Mechanical Engineer to join our dynamic team. In this role, you will contribute to all phases of engine development-from concept and design through testing and iteration-as we advance LiquidPiston's rotary diesel engines toward production. This is a high-impact, cross-functional role requiring strong mechanical design skills, analytical thinking, and a passion for solving complex technical challenges. Responsibilities: Design, analyze, and...

Metallurgical Engineer Location: Onsite in Bloomfield, CT About LiquidPiston: LiquidPiston, Inc. is developing a fundamentally new rotary internal combustion engine based on our patented thermodynamic cycle. With applications across aerospace, defense, commercial, and industrial markets, we are redefining what's possible in compact, efficient power generation. Join our mission to develop game-changing engine technology using advanced materials and manufacturing processes. Position Overview: LiquidPiston is seeking a Metallurgical Engineer to lead materials-focused efforts in support of engine design, development, and testing. This hands-on role is critical to enhancing performance, durability, and manufacturability of engine components operating under extreme mechanical and thermal stresses. The ideal candidate will have deep expertise in metallic materials and coatings, a strong understanding of tribology and fatigue behavior, and the ability to translate theoretical...

About LiquidPiston: LiquidPiston, Inc. is a technology startup reinventing the internal combustion engine based on a patented thermodynamic cycle and novel rotary architecture. Our compact, high-efficiency engines power applications across defense, aerospace, and commercial sectors. At LiquidPiston, you'll be part of a passionate team pushing the boundaries of what's possible in propulsion technology. Position Overview: LiquidPiston is seeking a hands-on, detail-oriented Engine Design & Development Engineer to join our core Skunkwerxs team. This role focuses on the design and development of rotary and piston engine components, supporting efforts from conceptual design through prototype validation. You will play a critical part in shaping next-generation propulsion systems that are smaller, lighter, and more efficient. Key Responsibilities: Design key engine components including pistons, rods, crankshafts, rotors, and housings. Develop CAD models and engineering drawings...

About LiquidPiston LiquidPiston, Inc. is reinventing the internal combustion engine. Our patented X-engine architecture is a compact, lightweight, and fuel-efficient rotary engine that operates on a novel thermodynamic cycle. With applications in defense, aerospace, robotics, and portable power, we're developing the next generation of high-performance, compact engines for critical power systems. We are seeking a Senior Design Engineer to play a key role in the design, simulation, and development of our advanced rotary engines. This is a hands-on, high-impact engineering role ideal for someone with a deep understanding of engine systems, a passion for innovation, and a strong background in mechanical design and simulation. Key Responsibilities: Generate and evaluate new ideas to improve the performance, durability, and manufacturability of LiquidPiston's rotary engines. Create detailed part and assembly models using SolidWorks. Lead early-stage engine architecture and layout...