Research Engineer

Security Engineer

Primer

An Introduction to Primer Primer is the unified infrastructure for global payments. We give finance and payments teams the visibility and control to reduce complexity, improve performance, and capture more revenue - all from a single platform. Backed by Sofina, Peak XV Partners, ICONIQ, Tencent, Accel, and Balderton, we're building the payments layer the world's best companies rely on. Watch our showcase > Read up on our $100m Series C Learn more about our culture > WHICH TEAM WILL YOU BE JOINING? You’ll help build the entire product security surface for a company processing payments at scale: threat modelling, security review, compliance, incident escalation, and the multi-year AppSec roadmap. You'd be the second hire, and the person that function finally gets to share the work with. This is a hands-on delivery role, and a genuinely formative one. You’ll help set the security strategy and architecture; you take real ownership of the work that turns it into reality, reviews, research, automation, and the day-to-day partnership with engineering teams. You'll have a clear direction to work within and someone senior to learn from, while still owning your projects end to end. Security at Primer sits close to the engineering teams it protects rather than off to one side, so you'll spend real time embedded with the people building Cloud, Infra, and product. For someone who wants to go deep in product security with room to grow, there are few better seats than being the second engineer in a function that's only now scaling. WHAT WILL YOU BE DOING? * Running security reviews and threat modelling on features and systems across Primer's product, and turning findings into clear, actionable guidance for the teams shipping them * Independently planning and delivering your own security projects, from initial design through to rollout * Building tooling and automation that makes future reviews faster and cheaper to run * Coordinating penetration testing and tracking remediation through to closure * Supporting the recurring compliance work (SOC2, PCI), including evidence collection and remediation tracking against fixed audit windows * Contributing to AppSec roadmap initiatives across areas like application threats, AI security, supply chain security, and ASPM * Picking up proactive security work, threat research and hands-on investigation, that a one-person function has never had the capacity for * Working alongside Cloud, Infra, and GRC on the security aspects of their projects WHAT WE'RE LOOKING FOR * Working experience in product or application security: you've done security reviews or threat modelling and can spot the risks that matter * The ability to read and write code, not just review it. You're comfortable building small tools and automation rather than only filing findings * Sound judgement about risk. You can weigh a real threat against a theoretical one and explain your reasoning clearly * The ability to plan and deliver your own work independently once you understand the direction, while knowing when to pull in the senior engineer * Clear communication with engineers who aren't security specialists, since most of your impact lands through their work Nice to have: * Exposure to compliance frameworks like SOC2 or PCI, or genuine appetite to learn them * Background in payments, fintech, or another regulated, high-stakes domain * Interest in areas like supply chain security, detection engineering, or AI security YOU MAY NOT LIKE IT HERE * It's remote-first and high autonomy. You'll get direction, but nobody checks your progress daily. If you need close structure, this will be uncomfortable * You'll move between proactive project work and reactive BAU, and priorities will shift as audits and incidents land. Tolerating that change is part of the role.   ✅ A TYPICAL INTERVIEW PROCESS * An initial intro call with a Talent Partner * An interview with the Hiring Manager * Challenge Stage - Contextualised to the role * A final, values-alignment interview WHAT'S THE CULTURE LIKE AT PRIMER? We're building a culture where people can do their best work and be proud of the impact they have. You'll be working with people who are mission-driven, smart, and reflective, and who are genuinely invested in building exceptional products and delivering success for our merchants. We work remotely, and have done since day one. We believe that building a successful, profitable company goes beyond proximity. We invest in our relationships through great remote working practices and thoughtfully designed face-to-face time, including workations, our annual company retreat, and access to co-working spaces across most major cities. The work is challenging. Scaleups are a challenge, and building category-defining products is a challenge. But there's a meaningful difference between a challenge and a struggle. At Primer, the right challenge comes with the right support: strong onboarding, a collaborative environment, and a team that is genuinely invested in your success. It's never something you face alone. OUR BENEFITS 🌍 We are fully remote and globally distributed; and have been since day one 💰 Competitive share options 🌴 Uncapped holiday, with 25 days minimum to be taken 🗣️ Co-working space access across major cities 📅 Workations & Company Retreat 💻 The best equipment for your role 🏠 £500 towards your home office setup 🔎 Generous learning budget 🏥 Private Medical Insurance 📈 A broad set of additional perks and benefits (depending on location) DON’T MEET EVERY SINGLE REQUIREMENT? At Primer, we're dedicated to building a diverse, inclusive, and authentic workplace. If you're excited about this role but your experience doesn't align perfectly with every qualification listed, we encourage you to apply. You may be the right candidate for this or other roles. Primer is committed to the equal treatment of all current and prospective employees and adopts a zero-tolerance approach to discrimination, regardless of age, disability, sex, sexual orientation, pregnancy and maternity, race or ethnicity, religion or belief, gender identity, marriage and civil partnership, or any other background or belief.

Senior Software Engineer

e.construct

e.construct We are an engineering firm that specializes in providing elegant engineering solutions for complex challenges. e.construct is a fast-growing firm with 7 offices around the world. At our core, we question how the very nature of how to evolve the structures that we inhabit to increase their performance and value. we design structures such as bridges, high-rise design, precast concrete engineering and post-tensioning design. The firm's core work is structural engineering; however, e.construct is increasingly holistic at its approach to buildings and it has divisions in MEP, Geotechnical and emerging construction technology such as 3D printing of concrete, technology and 3D laser scanning. VAES.ai We are a tech startup that is being incubated in the technology lab of e.construct and we employ technology to empower and eventually transform engineering. VAES’s mission is to reduce the amount of raw materials we design in our buildings and bridges by using optimization algorithms and machine learning. VAES consists of a team of software developers, civil engineers, machine learning experts, architects and graphic designers that builds tools that engineers can use to design and manufacture the next generation of cities. At VAES.ai, we’re building more than just a company—we’re shaping the future of technology, research, and sustainable solutions. We’re looking for a passionate Senior Software Engineer to join our growing team. What’s it like to work with us? ✨ Top Talent, Multidisciplinary Teams: Collaborate with designers, researchers, software engineers, and structural experts across borders. 🔧 We Build What We Need: From our performance evaluation system to internal tools—we don’t rely on external software. We design what works for us. 🌱 Sustainability Is in Our DNA: This isn’t a slogan. VAES was founded with the environment in mind—from how we build to why we exist. 🛡️ Stability with Heart: We prioritize long-term growth and people-first decisions. We support our team through every phase of their journey—including when they explore new paths beyond our walls. 📣 Open Channels, Real Leaders: Leadership is accessible and involved. We don’t do the fake open-door thing. We know our strengths—and we know our gaps. If you’re someone who wants to make a visible, measurable impact, you’ll find a place here. As a Senior Software Engineer, you will collaborate with Computational Structural Engineers to develop automation tools for Engineering Design. Amongst other libraries, you will be using Python libraries for QT (PySide6), VTK (pyvtk and pyvista), Numpy, Shapely, matplotlib, and scikit-spatial . Your software will integrate with existing industry standard Structural Engineering Software such as ETABS, Autodesk Revit and Opensees. Having solid geometrical and mathematical backgrounds will be extremely helpful in this role.

Senior Technical Researcher/Engineer

RTB House

Location: Poland We Are: RTB House is a global company that provides state-of-the-art marketing technologies for top brands and agencies worldwide. Its proprietary ad-buying engine is the first in the world to be powered entirely by Deep Learning algorithms, enabling advertisers to generate outstanding results and reach their goals at every stage of the funnel. You Will: As a Senior Technical Researcher/Engineer within the AdTech Technical Research Team, you'll play a pivotal role in exploring and understanding the latest technologies in the ad tech domain. You'll be responsible for conducting in-depth research, experimenting with new technologies, and collaborating with cross-functional teams to assess their potential for integration into our systems. Your role will involve a blend of programming, research, and analytical skills to evaluate the effectiveness and feasibility of various ad tech solutions. Desired Experience: * 5+ years of experience as researcher or engineer. * Strong technical proficiency: programming skills and the ability to understand large and complex systems and architectures. * Openness and willingness to experiment & learn: readiness to take on new challenges, explore new technologies, and continuously expand knowledge in the ad tech domain. * Independence & proactive attitude: ability to take initiative, make decisions, and act without excessive supervision while maintaining a high standard. * Goal-oriented mindset: focus on achieving specific project goals and adaptability in a dynamic environment. * Collaboration & communication: ability to cooperate effectively with teammates and other teams, clearly sharing knowledge and cooperating with external organizations (e.g. major browser vendors, W3C, GitHub discussions). * Ability to build Proof of Concepts (PoCs): creating prototypes and experimental solutions to evaluate effectiveness and utility. Selected Technologies & Projects: * Python, Java, Scala, TypeScript/JavaScript * PyTorch, NumPy, Pandas * Jupyter Notebooks * BigQuery, GCP * Browser Engines * Assessing new privacy mechanisms (e.g. Privacy Sandbox APIs) by building PoCs, testing, and suggesting improvements (via GitHub issues or meetings). The goal is to evaluate their feasibility, ensure compliance, and enhance user privacy. * Exploring solutions for Android and iOS, including creating prototypes to improve performance on mobile platforms. This requires close collaboration with other teams and leveraging ML opportunities. * Many more - including your own ideas!   We Offer: * Technology: access to the latest technologies and real opportunity to use of them in a large-scale and highly dynamic projects; extensive and rich datasets * Impact: your contribution will directly influence the company's business results and outcomes globally, while also giving you the chance to mentor less experienced colleagues in the team * Wellbeing: extremely flexible conditions – you act when it is convenient for you and devote as much time as you can; you can operate fully remotely * Culture: be part of a team of enthusiasts with wide experience in ML who willingly share their knowledge and learnings on a daily basis, no BS environment * Contract Types: B2B   Apply now!  You don't need to tick every box to apply. If you are passionate about digital marketing, send us your CV, and we'll review it.