Mechanical Engineer

Monumental

Monumental is automating on-site construction with robotics and software. Our mission is to make construction software-defined and autonomous - a future where beautiful, bespoke buildings go up in a single day, with minimal labour. We're a growing team of engineers, operators and technicians from companies like Palantir, Qualcomm, Dyson, Shopify, Tesla, Meta and Google DeepMind. It's still the early days of building the company, and this is a chance to make an outsized impact on a problem that matters. From day one, you’ll be working with an experienced founding team, backed by a $32M Series B led by Khosla Ventures and Plural. Monumental is based in the city centre of Amsterdam, in a beautiful facility with an fully equipped workshop and robot testing floor. We build the whole stack in-house - hardware and software, we're explicitly not a hybrid or remote-first company - you can't build robots or walls from home, so we're onsite five days a week.   Read more on why we believe you should spend your time working on construction, and learn about our vision and company. You might enjoy Based in Europe’s film on how we’re fixing Europe’s housing shortage, or this video by Andreas Klinger of what our office looks like. About the role Monumental are looking for a mechanical engineer to mature our current robot design and enable us build out and deploy a thousand-strong robot fleet to build beautiful, bespoke buildings. Our robots are deployed on sites across the Netherlands and the UK and will be in the US within a year. Most robotic applications require robots to function in controlled, clean environments. This is not the case at Monumental. Our robots must be reliable enough to withstand the harsh realities of a construction site: rain, dirt, temperature cycles and impact. This role will focus on improving the reliability of our robots, so that our growing fleet will survive months on construction sites with minimal maintenance. Expect to be regularly on site, so you know our product inside out. If you want an office job, this isn't the role for you. For more context on building hardware at Monumental, read Niall’s Substack on why he quit his job and moved country to make robots to fix Europe’s housing crisis. What you'll do * Own making sure our robots can build on construction sites for months with minimal downtime. Like most things at Monumental, we track this using the number of deployment bricks laid. You'll get us to 12,000 bricks laid before a hardware failure. * Rapidly understand how our robots work, the hardware that goes into them, and their failure modes. Systematically improve their design with respect to reliability, and conduct rigorous testing to validate the improvements. * Own the loop from discovering a failure in the field to a validated fix shipped to the fleet. Root cause the failure, design and test the fix in the office, then validate it holds up in the field. * Make sure R&D hardware is validated before it scales. Define validation criteria for hardware, design rigs for reliability testing, and raise the bar for validation within the hardware team. * Work with the maintenance team, both in the office and on deployments. Find maintenance pain points and fix them. What we're looking for * 2+ years of experience in reliability and test engineering, ideally in robotics. You have taken hardware that didn't survive its environment and made it robust. * Strong experience with environmental and mechanical reliability tests: IP, temperature, vibration and shock. You have designed and built the test rigs and run the analysis yourself. * Experience making and repairing electromechanical assemblies. * Experience shipping hardware from prototype through to medium-series production. * Strong knowledge of GD&T, and producing 2D and 3D drawings. Nice-to-haves * BSc in Mechanical, Electrical, Manufacturing or Industrial Engineering, or equivalent. * Examples of delivering complex electromechanical assemblies that operated at scale in harsh environments. * Experience developing accelerated life reliability tests. * Experience with electric motors, gearboxes, or actuators Why Monumental? Joining Monumental means being at the forefront of a movement aimed at making significant strides in the construction industry. Here, your work has the potential to impact not just the company but the future of how we build. If you're driven by innovation, eager to tackle complex challenges, and ready to make a tangible difference, we want to hear from you.   For open applications (where you don’t see an exact role match), please reach out to us at: iwanttojoin@monumental.co - share with us the most interesting or challenging project you’ve worked on, why you want to join and your CV or portfolio.   Unfortunately we do not currently support internships.   If you don’t meet all the qualifications here but are excited about Monumental and feel you’d still be able to help us solve difficult problems, do get in touch. We welcome generalists who focus on outcomes and are eager to learn on the job.

Ore Energy

THE ROLE At Ore Energy, we are on a mission to fundamentally expand the amount of energy society can reliably harness and use, helping move civilization toward a more abundant energy future. We are doing this by developing long-duration, utility-scale iron-air batteries that provide safe, low-cost, multi-day energy storage for electricity grids and data centers. We are expanding our technical development capabilities and are looking for two Junior Mechanical Engineers to join our team in Amsterdam. In this role, you will support the mechanical design, prototyping, and testing of our breakthrough iron-air battery cells, modules, and supporting hardware systems. Operating at the intersection of electrochemistry, materials science, and physical systems engineering, you will translate theoretical product requirements into practical, physical, and testable mechanical designs. This is a highly collaborative, hands-on, and iterative role for a curious, creative, and detail-oriented engineer who loves building, testing, and troubleshooting hardware in a fast-paced laboratory and workshop environment. KEY RESPONSIBILITIES * CAD & Design Ownership: Create, update, and manage high-quality 3D CAD models, complex assemblies, and detailed engineering drawings for battery housings, seals, supports, and internal components. * Hands-on Prototyping: Build, modify, and inspect physical prototypes for development, structural analysis, and validation testing. * Testing & Troubleshooting: Actively participate in mechanical testing, experimental setup, and troubleshooting of prototype designs to assess tolerance, sealing, fit, and durability. * Root-Cause Analysis: Identify design weaknesses, contribute to root-cause failure analysis, and propose creative engineering improvements to simplify assembly, safety, and reliability. * Basic Engineering Calculations: Perform fundamental mechanical calculations, tolerance stack-up analyses, and basic structural design assessments. * Cross-Functional Collaboration: Partner closely with electrochemical, materials, and testing teams to ensure mechanical designs seamlessly support chemistry and performance requirements. * Technical Documentation: Systematically document design iterations, test observations, engineering changes, and key learning outcomes. YOUR PROFILE * Education: Bachelor’s or Master’s degree in Mechanical Engineering, Product Design, Aerospace Engineering, or a highly related technical field. * CAD Proficiency: Strong foundational proficiency in 3D CAD modeling software (such as SolidWorks, Inventor, or similar) and a clear understanding of technical drawing standards. * Hands-on Mindset: A proactive, physical problem-solver who genuinely enjoys working with tools, building experimental setups, and handling hardware in a workshop or lab. * Analytical Curiosity: Strong analytical and detail-oriented mindset with a fast learning curve and a deep curiosity for battery technology and energy storage systems. * Navigating Ambiguity: Comfortable working in an iterative design environment with evolving technical requirements and challenges. * Collaboration & Communication: Highly collaborative, open to feedback, and possessing excellent communication skills in English to work effectively across multidisciplinary teams.

Mollie

Build with us Since 2004, we've had one clear goal: to make payments and money management effortless for every business in Europe. Today, more than 250,000 companies use Mollie to get paid, manage money and grow – with products designed to be simple, scalable, and dependable. With 950+ Mollies across 14+ locations, we care deeply about autonomy and craft. So we work in small teams, with real ownership, and we trust you to make the right decisions. We're building for the long term, so we provide the tools you need, processes you can rely on, and a balanced work environment to help you do work you're proud of. Sound like your kind of place? Let's build together. Your impact As a Sales Engineer at Mollie, you sit at the intersection of technology and business, supporting our sales team through the pre-sales phase with solutioning, demos, and technical presentations. You are the technical voice in the room for our Netherlands commercial team, helping mid-to-upmarket customers understand exactly how Mollie's payment solutions solve their challenges and close deals through genuine technical value selling. This role sits within a newly formed professional services structure, separate from the commercial organisation. That means real autonomy in how you work, dedicated leadership focused on craft and efficiency, and a direct line to product teams. You will own the full customer lifecycle from initial discovery through to deal closure, going deep on complex API integrations and custom solutions rather than off-the-shelf implementations. You are joining at a pivotal moment. Mollie is growing fast in the Netherlands, moving upmarket into more complex, longer deal cycles, and building out Sales Engineering as a true centre of excellence. The work you do here will directly shape how we win in one of our most important markets. What you'll ship * Custom technical demos and solution pitches tailored to specific customer problems, built using tools like Postman and AI to bring Mollie's API capabilities to life in a compelling and relevant way * Deep technical discovery across complex customer cases, from initial sales qualification through to contract signature, ensuring every deal is grounded in a thorough understanding of the customer's environment * Scalable solutions architecture work that addresses mid-to-upmarket customer challenges, focusing on custom API integrations rather than standard plugin implementations * Collaborative upsell and revenue initiatives with the CSM team, contributing technical expertise to identify and unlock growth opportunities within existing accounts * Knowledge-sharing sessions and internal training on Mollie products and the payments market, raising the technical bar across the broader sales and commercial teams * Structured handovers to post-sales implementation management at contract signature, ensuring a clean and high-quality transition that sets customers up for success What you'll bring * 2 to 3 years of experience in a sales engineering, solutions engineering, or pre-sales technical role, ideally with a background in engineering (mechanical, software, or similar) * A solid understanding of APIs and REST APIs, with hands-on experience using tools such as Postman to build and demonstrate integrations * Fluency in Dutch and English, with strong communication and presentation skills that allow you to translate complex technical concepts clearly for both technical and non-technical stakeholders * Proven ability to bridge business and technology perspectives, turning difficult technical problems into clear product solutions and pitching those solutions confidently to customers * Experience in a SaaS or e-commerce environment, with exposure to external customers and merchant interactions * Strong stakeholder management skills, with the ability to work effectively across internal teams and with customers at varying levels of seniority, including examples of using AI in demos or pitches Grow your way   At Mollie, growth is personal. We believe everyone should have the chance to develop their skills, explore new challenges and shape their career on their own terms. You'll get regular feedback and performance reviews to support your development, with fair and transparent salary reviews along the way. Many Mollies move into new roles or take on new projects to stretch themselves, and we actively hire from within to help you take the next step. No matter if you're aiming for promotion, exploring a different career path or building new skills, you'll be supported with the tools, trust and opportunities to grow your way. Unlock your full potential and join us to eliminate financial bureaucracy If you're excited by the idea of building what's next, for yourself and for thousands of businesses across Europe, we'd love to hear from you. Apply with your CV (in English) using the form below. Want a peek behind the scenes? Check out what life at Mollie is really like. AI at Mollie   We believe in Always Be Shipping, and AI brings that philosophy to life across every team, every role, every day. AI is core to how we build. It helps us move faster, simplify work and make smarter decisions, creating real impact for the businesses we serve. We're looking for people who are excited to use AI to shape the future of finance with us.