Senior Full Stack Engineer: Improbable

tem

📈 Who We Are: We are rebuilding the energy transaction, making it transparent and fair. Our goal is to put power back where it belongs, in the hands of customers and to take on one of the most critical problems of our century, access to low cost electricity. tem exists to fix a broken global energy market that’s long favoured legacy operators, intermediaries, and opaque pricing. Today’s electricity system was not designed for rapid decarbonisation, AI-driven efficiency or fair access for the actual users - businesses and generators. We’ve built the first AI native transaction infrastructure to reinvent how electricity is bought, sold and priced. Our technology is designed to cut out the inefficient fees, automate complex market flows, and bring transparency and fairness to energy transactions at scale. In late 2025, after extraordinary growth, we closed a $75 million Series B - led by Lightspeed Venture Partners with participation from Albion, Atomico, Allianz, Hitachi Ventures, Hitachi Ventures, Schroders Capital and others - positioning us for global expansion, deeper product innovation and category leadership. We’re scaling internationally and building toward a future where AI-driven infrastructure is foundational to electricity markets worldwide. Since launch, our modern utility product, known as RED, has already facilitated thousands of business customers and billions in energy transaction value, proving that modern software and AI can transform an industry built on legacy systems. At tem, we’re not just building another energy company, we’re rearchitecting market infrastructure so that transparency, efficiency and sustainability become the default, not the exception. 🏅 THE ROLE: We’re looking for Senior Full Stack Engineers to design and build the systems that power tem's core products and internal platforms. We’re hiring across several teams - including Developer Experience, Billing & Payments, Buy-Side Growth, Sell-Side Growth, and Pricing Infrastructure - all of which play a critical role in how we deliver seamless, modern energy technology. As a Senior Engineer, you’ll help shape the architecture and build the features that enable brokers, customers, and internal teams to work smarter and faster. Depending on your team, this could mean anything from enhancing developer tooling and shared services, to building scalable billing and payments infrastructure, to delivering intuitive customer-facing experiences that support acquisition and retention. In your first 12 months, you might: * Lead development of customer- and broker-facing portals that make complex energy workflows simple. * Build and evolve billing and payments systems that are reliable, transparent, and ready for scale. * Improve developer experience and platform foundations - including tooling, CI/CD, shared services, and automation. * Streamline internal operations through intelligent workflows, dashboards, and integrations. Across all teams, you’ll be joining a group that values ownership, clarity, and impact - and you’ll play a key role in building the systems that enable us to grow rapidly and serve customers exceptionally well. 🚀 RESPONSIBILITIES: * Build with impact: Develop full-stack features across modern front-end frameworks and serverless back-end systems, with a focus on performance, reliability, and usability. * Shape the experience: Build intuitive, high-quality interfaces and tools that improve the way customers and brokers interact with our platform. * Improve how we ship: Contribute to internal tooling, frameworks, and engineering workflows that help us deliver faster and with greater confidence. * Collaborate cross-functionally: Partner with Product, Design, and other Engineers to design thoughtful, user-centred solutions to complex problems. * Maintain high standards: Write clean, well-tested code, contribute to code reviews, and help improve team practices and documentation. 🎯 REQUIREMENTS: Must-Haves: * Proven product delivery experience: Experience as a Full Stack Engineer in a startup or fast-paced product environment, with ownership of key projects from start to finish. * Front- and back-end fluency: Strong experience with Python and/or Node.js, and modern JavaScript frameworks like React. * Cloud-native skills: Experience working with AWS services, especially serverless tools like Lambda, API Gateway, and DynamoDB. * User-focused mindset: Comfortable turning product and user problems into simple, elegant technical solutions. * Team-first approach: Experience working in cross-functional teams where Engineers, Designers, and Product Managers collaborate closely. Desirable: * Experience building platforms or tools for brokers, sales partners, or operational teams. * Exposure to the energy sector or other regulated industries. * Familiarity with real-time data systems or internal workflow automation. ✨ BENEFITS & PERKS: * Competitive salary - our current band for this role is £82,700 or equivalent in local currency. * We review salaries twice a year using real-time market data, with transparent, consistent pay for the same role and level. * Stock Options - everyone on the team has ownership in our mission. * 25 days holiday + public holidays - Swap public holidays for ones that matter most to you. Plus, get an extra day off for your birthday 🎉. * Remote & flexible working - We’re fully remote, distributed across Europe with clear core hours, and no internal meetings on Friday afternoons. * Home working & wellbeing budgets: * Up to £1,200 / €1,200 annually to upgrade your remote setup (co-working passes, equipment, etc.). * Up to £150 / €150 monthly on anything that supports your wellbeing - from therapy to gym memberships to meditation apps. 🗣️ INTERVIEW PROCESS: Our processes normally take around 2-3 weeks from first call to offer - please let us know about any adjustments to timelines that may be required. 1. First call with our Talent Team (30 Mins). This is to understand your experience, motivations, and discuss the role in more detail. 2. Behaviour Interview with our Engineering Managers (60 Mins). This is your chance to really understand the role, the expectations, and ensure alignment on ways of working. 3. Technical Interview with the Team (90 Mins). You’ll meet with potential peers in this session and will discuss technical topics and experiences. 4. Culture-Add Interview with Stakeholders (45 Mins). The final session will be with two cross-functional stakeholders, and will explore how your values align with ours, and is designed to be a genuine two-way conversation, your chance to understand what it’s really like to work at tem. We welcome applications from people of all backgrounds, experiences, and identities, including those that are traditionally underrepresented in the tech and energy sectors. If you’re excited about this role but not sure you meet every requirement, we’d still love to hear from you. Your unique perspective could be exactly what we’re looking for.

think-cell

About The Role  At think-cell, we are continuously improving how professionals create business presentations by introducing smarter automation and assistance features into our product. In this role, you will help turn new ideas and early AI-driven concepts into reliable features used by more than 1.3 million users worldwide.  You will build production-ready systems that connect modern backend services with intuitive user interfaces. In this role, you will work closely with both C++ engineers developing the core product and AI engineers exploring new automation capabilities, helping bring new functionality from concept into everyday product usage.  This role is ideal for engineers who enjoy building clean, scalable systems, care deeply about code quality, and are motivated by shipping impactful features in a highly collaborative engineering environment.    What you will do  * Build and maintain production-ready backend and full-stack features using TypeScript  * Integrate AI-powered functionality into the think-cell product, such as text editing assistance and automated slide creation  * Work closely with C++ engineers and AI engineers to translate ideas and prototypes into robust product features  * Contribute to a strong engineering culture with rigorous code reviews and high standards for code quality    You will be great for this position if you have  * A degree in computer science, mathematics, physics, or a similar technical field * Relevant experience as a backend or full-stack engineer  * Strong experience with TypeScript and Node.js in production environments  * Curiosity about AI technologies and interest in integrating them into real-world products  * Experience with Python or C++  is a plus     What We Offer * Brilliant Team: Work with international colleagues with strong academic and professional experience  * Work–life balance: Flexible working hours and an environment that respects your time and focus. * Stable Environment: Join a market leader with a reliable product. * Direct Exposure to C-level * Competitive salary & Relocation Support to Berlin   Why is think-cell the right place for you?   At think-cell, we’re not just building innovative software – we’re empowering over 1.3 million business users across 35,000 companies, including the world’s top consulting firms, DAX 40 leaders, and the biggest US blue-chip enterprises. With offices in Berlin, Denver, Boston, London, Tokyo, and Dubai, we are a diverse, passionate team of over 220 people, united by a shared commitment to excellence and innovation.   Our proprietary technology sets the standard in business document creation, and we're in a dynamic, growing market with enormous potential. As we continue to lead the way in our industry, we’re looking for talented individuals who can help us shape the future of business productivity.     Our Values    At think-cell, our values are at the heart of everything we do. They guide how we work, collaborate, and create value for our customers. As part of our team, you will embody and help shape the following principles that define us:   * Forward Thinking: We are adaptable innovators – we embrace change, value progress, and challenge the status quo to find the best solutions.   * Ownership: We take pride in our work – we own our mistakes, learn from them, and go the extra mile to deliver exceptional results.   * Customer First: We are committed to our customers – we understand, prioritize, and deliver lasting value through meaningful solutions.   * Unified Team: We cultivate collaboration and value every voice – we prioritize integrity and respect, ensuring everyone feels heard, supported, and aligned in our shared mission.   * Strive for Excellence: We are driven by excellence – we set ambitious goals, pursue quality relentlessly, and foster growth through exceptional talent.     Join Our Journey   We encourage you to apply even if you feel you don’t meet every single requirement. At think-cell, we celebrate diversity because we know it drives creativity and excellence. We welcome individuals from all backgrounds who are passionate about making a real impact.   Joining us means more than just a job – it’s an opportunity to be part of an inclusive, innovative, and supportive team that values collaboration and growth. Together, we can push boundaries and achieve great things.   Let’s shape the future of productivity together. We can’t wait to see what you’ll bring to our team.

tem

📈 Who We Are: We are rebuilding the energy transaction, making it transparent and fair. Our goal is to put power back where it belongs, in the hands of customers and to take on one of the most critical problems of our century, access to low cost electricity. tem exists to fix a broken global energy market that’s long favoured legacy operators, intermediaries, and opaque pricing. Today’s electricity system was not designed for rapid decarbonisation, AI-driven efficiency or fair access for the actual users - businesses and generators. We’ve built the first AI native transaction infrastructure to reinvent how electricity is bought, sold and priced. Our technology is designed to cut out the inefficient fees, automate complex market flows, and bring transparency and fairness to energy transactions at scale. In late 2025, after extraordinary growth, we closed a $75 million Series B - led by Lightspeed Venture Partners with participation from Albion, Atomico, Allianz, Hitachi Ventures, Hitachi Ventures, Schroders Capital and others - positioning us for global expansion, deeper product innovation and category leadership. We’re scaling internationally and building toward a future where AI-driven infrastructure is foundational to electricity markets worldwide. Since launch, our modern utility product, known as RED, has already facilitated thousands of business customers and billions in energy transaction value, proving that modern software and AI can transform an industry built on legacy systems. At tem, we’re not just building another energy company, we’re rearchitecting market infrastructure so that transparency, efficiency and sustainability become the default, not the exception. 🏅 THE ROLE: We’re looking for Staff Engineers to accelerate product delivery and enable scale across our customer acquisition, customer success and developer experience platforms. You’ll contribute through hands-on coding, drive architectural direction, and raise the technical bar across the team. In your first 12 months, you’ll lead the development of systems that redefine how brokers, customers, and internal teams interact with energy services - from real-time pricing workflows to intuitive self-serve tools. You’ll help us launch new products that streamline onboarding, improve service transparency, and lay the groundwork for rapid, sustainable growth. 🚀 RESPONSIBILITIES: * Build with impact: Architect and deliver end-to-end systems, from internal automation to customer-facing portals, ensuring they are scalable, fast, and user-friendly. * Own the platform: Improve and extend core platforms and developer tooling, making it easier for teams to build, test, and ship quality software. * Drive innovation: Rapidly prototype and iterate on new workflows and product ideas that expand our offering and improve the broker and customer journey. * Partner cross-functionally: Collaborate with Product Managers, Designers, and other Engineers to scope, design, and deliver high-impact solutions. * Raise the bar: Lead by example through code reviews, mentorship, and championing engineering best practices across the team. 🎯 REQUIREMENTS: Must-Haves: * Track record in fast-paced environments: Experience as a Senior or Staff Engineer in a high-growth startup or scale-up, with a strong bias toward shipping. * System design at scale: Proven ability to design and build complex systems that power both back-end automation and front-end experiences. * Modern tech expertise: Deep experience with Python, Node.js, and AWS serverless architecture (e.g., Lambda, API Gateway, DynamoDB). * Front-end capabilities: Skilled in developing responsive, performant front-ends using modern JavaScript frameworks such as React. * Product-minded mindset: Experience working closely with product and design teams to solve user problems, not just deliver features. * Can deal with ambiguity: Comfortable navigating changing priorities and incomplete information to make strong technical decisions. Desirable: * Exposure to the energy sector or other regulated industries. * Experience building internal tools or platforms for brokers, sales teams, or support agents. * Familiarity with real-time data processing or agentic/AI-driven systems. ✨ BENEFITS & PERKS: * Competitive salary - our current band for this role is £104,000 or equivalent in local currency. * We review salaries twice a year using real-time market data, with transparent, consistent pay for the same role and level. * Stock Options - everyone on the team has ownership in our mission. * 25 days holiday + public holidays - Swap public holidays for ones that matter most to you. Plus, get an extra day off for your birthday 🎉. * Remote & flexible working - We’re fully remote with clear core hours, and no internal meetings on Friday afternoons. * Home working & wellbeing budgets: * Up to £1,200 / €1,200 annually to upgrade your remote setup (co-working passes, equipment, etc.). * Up to £150 / €150 monthly on anything that supports your wellbeing - from therapy to gym memberships to meditation apps. 🗣️ INTERVIEW PROCESS: Our processes normally take around 2-3 weeks from first call to offer - please let us know about any adjustments to timelines that may be required. 1. First call with our Talent Team (30 Mins). This is to understand your experience, motivations, and discuss the role in more detail. 2. Behaviour Interview with our Engineering Managers (60 Mins). This is your chance to really understand the role, the expectations, and ensure alignment on ways of working. 3. Technical Interview with the Team (75 Mins). You’ll meet with potential peers in this session and will discuss technical topics and experiences. 4. Culture-Add Interview with Stakeholders (45 Mins). The final session will be with two cross-functional stakeholders, and will explore how your values align with ours, and is designed to be a genuine two-way conversation, your chance to understand what it’s really like to work at tem. We welcome applications from people of all backgrounds, experiences, and identities, including those that are traditionally underrepresented in the tech and energy sectors. If you’re excited about this role but not sure you meet every requirement, we’d still love to hear from you. Your unique perspective could be exactly what we’re looking for.