Senior Backend Engineer (all genders)

Sumup

ABOUT THE TEAM At SumUp, we're on a mission to bring merchants and consumers closer together and help local communities thrive. Within the Consumer Mission, we're building a rewarding banking experience that connects people to the small businesses they love while tackling some of the most technically demanding challenges in fintech: critical infrastructure migrations, smooth, uninterrupted payment experiences, seamless open banking integrations, and high‑availability banking systems that can’t afford to fail – all while enabling free transactions for our merchants. This role sits at the heart of that work — you’ll take real ownership of backend services that are close to our consumers, directly shaping their everyday experience, with impact that’s visible and felt across the entire platform. 🎥 Take a look inside our London office WHAT YOU'LL DO * Build and maintain Backend services for Core neobanking features including bank transfers, open banking, savings accounts, and payment processing * Take end-to-end ownership of features and projects, covering scoping, design, development, testing, deployment, and maintenance, leveraging Go along with Docker and Kubernetes for container orchestration. * Take ownership of critical infrastructure migrations — including our banking core system transitions — without disrupting live customer experiences * Collaborate closely with cross-functional teams including product, design, data science, security, and operations) to understand requirements, provide technical insights, and contribute to architecture discussions that ship meaningful banking features end-to-end * Support fellow developers and actively help build a collaborative, innovative engineering culture * Shape technical architecture and lead code reviews, helping define and promote best practices in code quality, testing, automation, and security to raise the overall engineering bar. * Build and integrate tools and systems that improve operational efficiency and reliability, with strong observability through monitoring, alerting, and hands‑on involvement in incident response and post‑mortems. YOU'LL BE GREAT FOR THIS ROLE IF YOU HAVE… * Strong proficiency in Go, Kotlin or Python, with a track record of building scalable, production-grade backend services * Experience working with cloud platforms (AWS or comparable) and container orchestration tools such as Docker and Kubernetes * Solid understanding of SQL and NoSQL databases, distributed systems, and the trade-offs that come with high-availability requirements * Comfort navigating complex, regulated environments — whether that's financial services, payments, or similarly high-stakes domains * A collaborative, product-oriented mindset with the ability to work independently, communicate clearly, and adapt when priorities shift Any of the following would be considered a plus * Previous experience in a Growth-focused engineering team. * Familiarity with the Fintech or Banking regulatory landscape. No visa sponsorship available with this position WHY YOU SHOULD JOIN SUMUP * 🌎 Opportunity to work with a truly global, multicultural team from our central London Bridge location. This involves an office-first setup * 🌈 Commitment to Diversity and Inclusion: be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced * 🚀 Enrolment onto our Virtual Stock Option programme: you will own a stake in SumUp's future success * 🏖 Generous time off: enjoy 28 days of paid leave, plus bank holidays and special leaves * 📚 A dedicated annual L&D budget for attending conferences and/or advancing your career through further education * 🏥 Health matters: private health insurance, including optical and dental * 🚗 Life made easier: salary-sacrifice commuter benefits via Gogeta * 💼 Financial security: retirement scheme (SumUp matches 7% when you contribute 5%) * 🛡 Peace of mind: life insurance from MetLife for 2× your salary * 🌴 Break4me: 1-month sabbatical after 3 years of service * 🔗 Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team ABOUT SUMUP Be empowered to do more that matters. At SumUp, we're on a mission to empower small businesses across the globe by providing simple and affordable tools that allow them to thrive. Today, over 4 million businesses in 37 markets rely on SumUp as their financial partner to manage payments, finance and customer relationships. Our commitment to small businesses is reflected in our diverse team of over 3,000 SumUppers from over 90 nationalities, united by global collaboration and an innovative mindset. Our core values lay the foundation for who we are and what we stand for, shaping our work culture and driving our success. We foster inclusivity and a continuous learning culture, providing a safe space for personal and professional growth. Our differences make us unique and strong as we strive to create an environment where everyone belongs and feels supported, no matter how they identify. SumUp is proud to be an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce. We don't make hiring or employment decisions based on race, colour, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age or any other basis protected by applicable laws or prohibited by company policy. Our commitment extends beyond recruitment to creating a safe and respectful workplace where harassment of any form is strictly prohibited. Discover more about our culture and opportunities on our careers website, and follow our journey on LinkedIn, Instagram, and TikTok. 📽 Want to bring this role to life visually? Check out our Global Employer Brand video library to add a video to your job post or create LinkedIn content. Job Application Tip We recognise that candidates feel they need to meet 100% of the job criteria in order to apply for a job. Please note that this is only a guide. If you don’t tick every box, it’s ok too because it means you have room to learn and develop your career at SumUp.

envelio

ÜBER DAS ARBEITEN BEI ENVELIO Zu einfach ist langweilig! Gemeinsam haben wir die Mission, die Energiewende voranzutreiben. Wir lieben, was wir tun und dabei ist uns kein Thema zu groß. Wir übernehmen Verantwortung für unsere Arbeit und wachsen an jeder neuen Aufgabe. Kurz gesagt: Own it, love it, grow with it. Wir sind ein bodenständiges Team aus Kaffee- und Mate-Liebhaber:innen. Unser Geek-Humor resultiert in einer rituellen Nutzung von Emojis und der enzyklopädischen Herausarbeitung von unnützem Wissen. Mehr als 150 envelianer:innen mit über 20 verschiedenen Nationalitäten sind bereits an Bord. Komm dazu und wachse mit uns! DEINE ROLLE Als Senior Expert - Energy Grid Solver & Calculations (all genders) bist du Teil eines Engineering-Teams mit fundierten Kenntnissen in den Bereichen Elektrotechnik, Coding, Datenbanken und Softwarearchitektur. Gemeinsam mit dem Team treibst du die Themen rund um elektrische Energietechnik und elektrische/mathematische Modelle und Algorithmen voran und hast Einfluss auf die User Experience, unser Unternehmen und unsere Entwicklungspraktiken. Ein besonderer Schwerpunkt liegt auf Modellen und Berechnungsmethoden/mathematischen Solvern für asymmetrische Netzstrukturen und verwandte Komponenten. WIE DU ETWAS BEWIRKST * Du bist Teil einer funktionsübergreifenden Abteilung und eines Teams (Backend-, Frontend-, DevOps-Entwickler, Design und Product Manager) und entwickelst modernste elektrotechnische Anwendungen, die einen effektiven Kundennutzen bringen * Du konzipierst, erweiterst und implementierst elektrotechnische Workflows und mathematische Solver nach dem aktuellen Stand der Technik und Best Practices * Du bist Teil der Konzeption und Entwicklung professioneller Backend-Lösungen zur kontinuierlichen Weiterentwicklung unseres Produktes in einer agilen Arbeitsumgebung zusammen mit den anderen funktionsübergreifenden Teams in der Engineering-Abteilung DEIN PROFIL Perfektion ist ein Mythos! Viel mehr interessiert uns der Mensch hinter dem Bildschirm. Diese Kriterien sind also eher als Orientierungshilfe für dich gedacht. Wir sind gespannt, wie deine individuellen Fähigkeiten zu uns passen. * Du hast einen elektrotechnischen Hintergrund und verfügst über fundierte Kenntnisse bezüglich der Struktur und Modellierung der Komponenten des elektrischen Verteilnetzes (z. B. Leitermodellierung einschließlich Kopplungen, detaillierte Transformatormodellierung, Erdungskonzepte und -Betriebsmittel). Erfahrung mit asymmetrischen Elementen wie z.B. Center-Tapped/Split-Phasen-Transformatoren und Trafobänken ist ein Plus. * Du hast fundierte Kenntnisse und Erfahrungen mit der Implementierung von Methoden für Netzberechnungen (verschiedene Leistungsflussverfahren symmetrisch und mehrphasig, Kurzschluss-/Fehlerberechnungen). Idealerweise verfügst Du über Kenntnisse bezüglich Zustandsschätzungen und allgemeiner Optimierungsprobleme. * Du verfügst über fundierte (praktische) Erfahrung in der Programmierung - 5 Jahre oder mehr - im Kontext von Elektrotechnik und mathematischen Algorithmen (Python, idealerweise auch C++, Go oder Rust), Softwaredesign und Architekturprinzipien im Kontext von großen Softwareprojekten. * Du schreibst mit Begeisterung und Leidenschaft modernste Software als Hauptbestandteil deiner täglichen Arbeit * Du bist ein Teamplayer und arbeitest leidenschaftlich gerne mit talentierten und inspirierenden Menschen zusammen * Du suchst nach technischen Herausforderungen und bist stolz darauf, intelligente und kreative Lösungen zu finden * Du verfügst über verhandlungssichere Englischkenntnisse (Niveau C1) * Idealerweise bist du mit Teilen unseres Tech-Stacks vertraut, kennst aktuelle Software-Design-Prinzipien und freust dich darauf, mit den aktuellen Best Practices der Branche Schritt zu halten WIE WIR SOFTWARE ENTWICKELN * Agile Arbeitsweise mit Kanban in interdisziplinären Squads   * Continuous Integration / Continuous Delivery * Sauberer und einfacher Code und zielgerichtete Dokumentation * Hohe Unit-Test-Abdeckung und regelmäßige Code-Reviews * Wissensaustausch zwischen den Entwicklern   * "You Code it - You Own it" – Squad-Verantwortung für bestimmte Funktionsbereiche des Produkts UNSER TECH STACK * Python, inkl. zusätzlicher Pakete/Frameworks, Pytest und Celery   * Modernes C++20 für berechnungsintensive Aufgaben  * PostgreSQL   * RabbitMQ, Redis   * Docker, Kubernetes DEINE BENEFITS * Passe den Arbeitsmodus an deinen Lifestyle an – fully remote oder hybrid mit Office-Option * Option zum mobilen Arbeiten aus dem Ausland (bis zu drei Monate pro Jahr von überall in der EU oder den USA) * 30 Urlaubstage + 3 corporate holidays * State of the art Technologie und moderner Tech Stack * Sehr gute Hardware (MacBooks, 2 Bildschirme je Arbeitsplatz im Büro) * Unterstützung deiner Gesundheit mit der Urban Sports Club Kooperation * Professionelle Unterstützung rund um mentales Wohlbefinden für dich und deine Familie durch unseren Partner nilo * Flexible Nutzung eines monatlichen Mobilitätsbudgets (z.B. Jobrad, ÖPNV) * Zeit und Budget für individuelles Wachstum * Regelmäßige Tech & Growth Talks für internen Wissensaustausch  * optionale betriebliche Altersvorsorge * Regelmäßige Company und Team Events

Avelios Medical

ABOUT US Our mission at Avelios is to unlock clinical data to power seamless healthcare operations for better patient care. To do so, we have built a modular software platform that digitizes and optimizes workflows in hospitals with cutting-edge technology in a user-friendly way. With our software, we enable hospitals, doctors & nurses to provide their patients with the best possible care. We are growing fast and want to keep expanding our team and business to fundamentally digitize healthcare for the better. We appreciate different backgrounds and see diversity as one of our strengths. THE TEAM AND ROLE As a (Senior) Backend Engineer (all genders), you’ll help build the robust, secure infrastructure that powers our platform in clinical environments. You’ll be part of our core development team, designing scalable services, optimizing performance, and applying best practices in backend engineering to help deliver real impact in healthcare. YOUR RESPONSIBILITIES * Collaborate closely with our core development team to build secure and reliable backend services * Design, test, deploy, and maintain critical Avelios services and infrastructure * Develop scalable, high-performance software in a healthcare context * Apply and advocate best practices in fast, secure software engineering * Work with modern technology to solve complex challenges in clinical digitization * Contribute ideas to improve system architecture, usability, and performance YOUR QUALIFICATIONS * Degree in Computer Science, Informatics, Business Informatics, or equivalent practical experience * Proficiency in at least one of the following: Java, C++, or Rust * Demonstrated coding experience — GitHub contributions or personal projects are a plus * Eagerness to learn and work with new technologies and tools * Strong problem-solving skills and a hands-on, solution-oriented mindset * Fluency in English YOUR BENEFITS * Variety in your tasks and the opportunity to take ownership * An international, informal team structure in a motivating start-up atmosphere, allowing you to participate directly in our customer growth story and the overall success of Avelios * Ability to gain valuable hands-on experience in a startup backed by leading international VCs * Support for your personal development through continuous learning and feedback * Set your own rhythm with flexible working hours and trust-based time tracking * A virtual stock option package (VSOP) that lets you participate in Avelios’ long-term value creation * A monthly meal allowance up to 75 euros, full coverage of the Deutschlandticket, Urban Sports Club or a subsidized Wellpass membership, a bike leasing program and Corporate Benefits that give you access to discounts from a wide range of providers in various areas