Applications and Systems Integration Engineer

Job description

You will be one of the earliest hires shaping how our heat pump systems move from customer conversation to deployed infrastructure. This role sits within the Technical Operations team while collaborating cross-functionally with the entire team. The position was created to ensure tight alignment between customer deployments, system integration, and operational execution. By nature of being an early-stage, fast-moving start-up, you will initially operate as an individual contributor across multiple phases of the product lifecycle. As we scale, and with the right fit, this role could naturally evolve into building and leading this function.

The role is hybrid (with an expectation of 2-3 days in our office in Datchet), with regular travel for customer engagement, site surveys, commissioning support, and early deployments. We are based in an industrial unit based in Datchet (near Windsor, Slough, Greater West London).

Key Responsibilities

1) Intake & Pre Sales

• Lead technical discovery calls and site readiness assessments to support Commercial team.
• Build/validate steam profiles, thermal loads, duty cycles, and temperature requirements.
• Size and select heat pumps; define operating envelopes, temp outputs, flow rates, and integration points.
• Structure feasibility analyses (what’s possible, trade‑offs, quick go/no‑go).
• Set realistic expectations; avoid over‑promising while enabling a compelling commercial path.

2) Post Sales Integration & Delivery

• Own the technical handoff and integration plan (mechanical/electrical/process scope).
• Coordinate contractors, rigging, commissioning, and on‑site testing; provide hands‑on support where needed.
• Interface with OEMs/integrators (e.g., Copeland/GEA) and EPCs; conduct design reviews and ensure alignment on P&IDs and controls.
• Oversee integration of relevant subsystems to existing gas boiler systems where applicable.
• Document performance, lessons learned, and support issue resolution through commissioning.
• Support Operations in site readiness level assessment and deployment activities.

3) Partners, Compliance & Permitting

• Work with EPCs/integrators and permitting partners to de‑risk delivery (method statements, risk assessments, local building/industrial permits).
• Ensure conformance to site standards (HSE, electrical, pressure systems, etc.).

 

4) Data, Documentation & Enablement

• Gather and structure customer data (profiles, metering, historical loads).
• Maintain technical documentation, BoMs, and commissioning records.
• Provide technical support to commercial pilots (especially in the Mar–Apr timeframe noted) and help mature that pipeline.

Required Skills & Qualifications

• Strong systems integration and mechanical design capability with experience progressing projects from concept and proposal to deployment and commissioning.
• Ability to produce high quality design documentation and schematics/P&IDs and project reporting.
• Ability to identify plant and process specific challenges and develop effective engineering solutions to support the integration of HotGreen heat pumps.
• Several years’ experience with complex system integration in heavy-industries, steam systems, process systems, and/or hybrid heating solutions with a focus on industrial deployment. Additional experience in HVAC and refrigeration cycles is preferred.
• Strong techno-economic analysis capability and comfort working with customer operational data.
• Understanding of thermodynamics, fluid mechanics, and heat transfer as applied to industrial energy systems.
• Strong communication skills with ability to support engineer-to-engineer sales and interface effectively with clients, project teams, and field engineers.
• Willingness to travel for site surveys, installation support, and customer meetings (domestic/international as needed).
• Bachelor’s or Master’s degree in Engineering or equivalent degree, or prior experience as an Applications or Systems Integration Engineer.
• Right to work in the UK.

Preferred Skills

• Heat pump knowledge: Proven experience with industrial heat pumps (selection, sizing, temperature lift, COP trade‑offs, integration with existing systems).
• European language (German preferred) working proficiency preferred.
• Familiarity with design and construction frameworks (i.e. RIBA or HOAI).

If you fulfil some but not all the criteria above but believe you would be well suited for the role, then we still encourage you to still apply.

30-60-90 Day Plan

While priorities may evolve in a fast-moving start-up environment, the following outlines the intended focus areas and objectives for the first three months in role.

First 30 Days: Product & Customer Immersion

• Develop deep understanding of heat pump systems and site integration architecture
• Learn pilot deployment requirements and customer profiles
• Shadow customer and partner conversations
• Review active opportunities and feasibility approach
• Support technical proposals using customer heat usage data

60 Days: Deployment Enablement

• Start owning technical commercial support
• Support pilot site project planning
• Contribute to integration scoping and site readiness planning
• Conduct or support site visit to assess infrastructure constraints

90 Days: Deployment Ownership & Optimisation

• Support P&ID reviews (contractor and customer)
• Contribute to FAT validation and commissioning support
• Serve as technical POC through site acceptance and startup
• Feed deployment insights back into product and applications development
• Start building tools/frameworks to standardise feasibility analysis

How to apply

Send a PDF CV and Cover Letter to careers@hotgreensolutions.com with the subject: "[FIRST NAME, SURNAME] Applications and System Integration Engineer".

Within your cover letter, answer the following three questions:

1. Why are you interested in applying for HotGreen?
2. Describe a project where you had to take a complex thermal or mechanical system from customer need through to real-world deployment. What were the biggest integration risks, and how did you mitigate them?
3. What frustrates you about how industrial systems are installed today? 

Disclaimer: Only applications via the provided email address will be reviewed.

 

Who we are

HotGreen was founded out of a frustration with the lack of affordable green heating solutions for industry. With industry facing mounting cost pressures and shrinking margins alongside the climate crisis, we identified an urgent need for technologies that enabled profitable decarbonization of industrial heat - helping plants save money while cutting emissions. This comes from a fundamental belief that only by making decarbonization profitable and technologies accessible can the transition to net zero be accelerated across industrial sectors.

As engineers, we believe technology can provide an economically-driven pathway that doesn't rely on subsidies or regulation to achieve mass industrial decarbonization. The industrial heat we're targeting - low and mid temperature ranges below 250°C - represents 10% of global emissions. We're building the most commercially viable heat pump to tackle this massive opportunity, creating solutions that industry is actively incentivized to adopt and that will finally retire fossil-fuel powered boilers.

Our values

As an early stage team, we think of ourselves as playing ‘Jazz’. We trust each other with our respective instruments and parts in the piece, and lean into playing music that’s never been played before and without a musical score. While each of us can respectively hold an incredible ‘solo’, collectively we can create something exceptional. We are looking to bring on new ‘band members’ who are exceptional at their respective skillsets, but also work well as part of the team and complement those around them.

HotGreen has been built with the following values:

•Bold: We are bold in our ambitions, and unafraid to look, act and think differently to the fossil-fuel powered boiler industry, or to our other heat pump allies. We are not afraid to go where others have not.

• Simple, transparent and direct: Simplification runs through everything we do, from the design of our systems to the way we communicate. We actively identify simpler pathways, work hard to avoid overcomplication, and put effort into communicating in a way that is straightforward, and concise.

• Acting with Compassion and Integrity: We approach every interaction with empathy, respect, and honesty. We consider the human impact of our decisions, listen with the intent to understand, and treat others with fairness and dignity. We hold ourselves to high ethical standards, follow through on our commitments, and choose to do what is right.

• Purpose driven and Impact-focused: We relentlessly focus our work on the outcome in mind and the impact we are looking to achieve. Our purpose guides where we spend time, energy, and resources. We say no and set boundaries on tasks which do not support impact.

•Reliable and customer-oriented: We are open, honest and transparent about what we are able to do and achieve. We are endlessly curious about our customers, their needs and desires, and how they work. We are committed to delivering excellent results for our customers. 

• Cross-domain problem-solvers: We are pragmatic problem solvers, who iterate, innovate and work our way to solving problems large and small. We find our way to solutions regardless of whether those problems lie inside or outside our field of expertise and responsibility.

• Uncompromising excellence: We believe the climate crisis and our customers demand exceptional work. We maintain high standards across every dimension of what we do, while creating an environment where people can ask for help, learn from mistakes, and grow. Excellence is achieved together, not at the expense of one another.