Backend Engineer at Junior | London

Join Trainline as a Junior Android Engineer and embark on a journey to help revolutionize travel. As part of our dynamic team, you will be engaged in developing cutting-edge applications that enable millions to easily book and manage their travel. This role offers a fantastic opportunity to learn and grow within a supportive environment.

Role overview flohealth seeks a Senior or Lead Android Engineer based in London. The role focuses on developing and enhancing mobile apps that support users in managing their health. This position combines hands-on Android development with technical leadership responsibilities. What you will do Collaborate with designers, product managers, and fellow engineers to deliver new Android features and improvements Design, develop, and maintain Android applications, emphasizing usability and strong performance Influence technical decisions and contribute to the architecture of both new and ongoing projects Mentor junior engineers and share knowledge of best practices within the team Requirements Significant experience building and releasing Android applications Deep knowledge of Android frameworks and design patterns Comfort working collaboratively in cross-functional teams Background in mentoring or leading engineers is considered an advantage

Join SumUp as a Senior Android Engineer, where you'll play a pivotal role in developing our dynamic merchant-focused ecosystem. This is your chance to design and enhance high-impact solutions—such as Kiosks, Kitchen Display Systems (KDS), Customer Facing Displays (CFD), and POS peripherals—that support intricate retail and restaurant operations globally. In this position, you'll seamlessly integrate hardware and software, delivering exceptional experiences for millions of merchants and their clientele.Your Responsibilities:Lead the design and expansion of Android-based merchant solutions, specifically tailored for self-service Kiosks and specialized point-of-sale interfaces.Enhance and develop impactful features that elevate the experience for both merchants and consumers across a diverse range of products.Assist in our transition to Kotlin Multiplatform (KMP) to streamline business logic across various mobile platforms.Craft maintainable, accessible, and high-performing user interfaces utilizing Jetpack Compose.Enhance product reliability through the implementation of comprehensive testing frameworks and increased automated QA coverage for our hardware-integrated software.Work collaboratively with cross-functional teams to deliver integrated features that align with the requirements of global enterprise partners.Conduct code reviews, uphold architectural standards, and guide fellow engineers in the best practices for developing reusable UI components.

Motorway is looking for a Senior Android Engineer to join the team in London. This role centers on developing and refining mobile applications that help both the business and its users. Daily work brings close collaboration with designers, product managers, and fellow engineers to deliver reliable, user-friendly Android features. Key responsibilities Design, build, and maintain Android applications for Motorway Partner with cross-functional teams to launch new features and enhance existing ones Take part in architectural decisions, code quality discussions, and user experience improvements Collaboration and impact This position involves regular teamwork across disciplines, ensuring that the Android experience aligns with Motorway’s goals and user needs. Input on architecture and user experience is valued at every stage. Location The role is based in London.

Join Freetrade as a Mid-Level Android EngineerAt Freetrade, our mission is clear: to simplify investing and make it accessible for everyone. For too long, investing has been an intricate and costly endeavor, preventing millions from maximizing their savings. We're here to change that narrative.As we expand our team, we are on the lookout for individuals passionate about transforming how our customers invest and build their wealth. If you thrive on tackling complex challenges and are eager to develop innovative products, you will find your place with us.With an exciting year ahead, 2026 marks a significant milestone for us. Following our landmark partnership with IG Group, we will maintain our independence while benefiting from the support of an established leader in the industry.This year, we are accelerating our development plans and enhancing our product offerings, introducing features such as mutual funds, bonds, and family investment tools. Additionally, we are exploring the integration of AI to elevate our customers' experience.If you are eager to expand your technical expertise, contribute to innovative products, and work in a dynamic environment that embraces creativity and experimentation, this opportunity is tailored for you!Why Join Our Engineering Team?Become a vital part of a forward-thinking team that is redefining the investment landscape. As an engineer, you will be instrumental in developing and maintaining a resilient, scalable platform utilized by thousands daily. We address complex technical challenges, foster innovation, and create impactful solutions. Your code will not just operate; it will influence investment decisions across the UK.The Freetrade Android mobile application empowers customers to explore investment opportunities across the UK, US, and EU financial markets.We are seeking a skilled Android Mobile Engineer to join our dynamic team.The ideal candidate will possess a solid understanding of the Android mobile platform, demonstrate problem-solving abilities, and have a strong desire to enhance their skills within a collaborative team environment.This is a unique chance to collaborate with experienced mobile engineers across iOS and Android, fostering the development of your skills.As part of our dedicated mobile engineering team, you will implement new features and ensure high levels of customer satisfaction by addressing queries and feedback. Collaborating with design, product, and QA teams, you will craft exceptional user experiences that delight our customers.

Our Story Welcome to Zopa! Since our inception in 2005, we have pioneered the peer-to-peer lending space, and in 2020, we proudly launched Zopa Bank. Our mission is to reshape the financial landscape by prioritizing our customers' needs and preferences. We are dedicated to creating a banking experience that is accessible, empowering, and innovative. Discover more about our exciting offerings at Zopa.com! We celebrate our remarkable achievements, thanks to our incredible team. Recognized not just for industry accolades, we have also been named among the top three Most Loved Workplaces in the UK. If you thrive on tackling unconventional challenges, embrace innovative thinking, and are motivated by the desire to make a significant impact, Zopa is the place for you. Join us and make a difference! Want to see our journey? Follow us on Instagram @zopalife.About the TeamWe are on an exciting journey to enhance our mobile application, and we are seeking a talented individual to assist in developing our new Android app, utilizing Kotlin.As part of our Mobile Platform team, you will be instrumental in shaping the app's architecture, shared capabilities, libraries, core experiences, and analytics infrastructure. The team is a vital contributor to Zopa’s mobile community and plays a key role in advancing our mobile technology.With an aspiration to become Britain's leading bank, we have recently unveiled the Zopa Account — a highly engaging product aimed at the mass market. Our mobile app serves as the primary touchpoint for our customers, and it must be high-performing, dependable, and user-friendly. Therefore, we are investing significantly in the quality and evolution of our mobile technology.Currently, our app is developed using React Native, but we are progressively adopting native capabilities in Swift and Kotlin. We are in the midst of a comprehensive transformation of the Android experience, transitioning towards a more native approach, and we invite you to join us on this exciting journey.

About Tripadvisor The Tripadvisor Group is dedicated to connecting travelers with experiences that are truly worth sharing. Our mission is to be the world’s most reliable source for travel information and experiences. Using our innovative brands, advanced technology, and extensive capabilities, we link our global audience to partners through engaging content, travel insights, and dynamic marketplaces for accommodations, activities, dining, and various travel categories. Tripadvisor, Inc. (Nasdaq: TRIP) oversees a diverse portfolio of travel brands, including Tripadvisor, Viator, and TheFork. About the Role We are seeking a talented Software Engineer II (Android) to join our rapidly expanding mobile team. This position is available to candidates who are within a commutable distance (generally within 2–3 hours) of our office hubs in Oxford or London. We value a flexible work environment while cherishing meaningful in-person interactions for collaboration. Expect a remote-first working model with occasional in-person gatherings at your nearest office for team alignment, planning, and other significant events. At Tripadvisor Experiences, we foster a friendly and engaging atmosphere where our primary goal is to accomplish tasks effectively. Our engineers collaborate closely with product managers and designers, engaging in every stage of the development process from design to deployment and feedback. Most of our engineers are involved in releasing code to production every few days, supported by a daily release cycle. What You'll Do As a member of Tripadvisor Experiences, our engineers are adaptable problem-solvers ready to tackle a variety of technical challenges. This full-stack role primarily focuses on Android development, with opportunities for backend projects as well. You don’t need to be an expert in every area; if you’re enthusiastic about learning, we’ll provide the support you need to enhance your skills. Our technology stack includes Kotlin, Coroutines, Jetpack Compose, Cursor, and GraphQL, organized in a modular layout following the clean architecture principles with MVVM. Write code! Our engineers prioritize their passion for coding and do what they excel at. Engage with code at all levels – while the primary focus is on app development, you will also have chances to work on backend microservices. Collaborate closely with Product and Design teams to create user-centric solutions.

Senior Android Software EngineerAt Deliveroo, we are on a mission to revolutionize the shopping and dining experience, powered by our commitment to impact, innovation, and growth. Our Engineering teams face complex technical challenges in a global, three-sided marketplace, creating and enhancing systems that serve millions of customers, riders, and partners every day.From real-time logistics to robust infrastructure and marketplace optimization, we design, build, and maintain technology that fuels Deliveroo’s expansive growth.We are seeking a Senior Android Software Engineer to join our dynamic team in London. In this role, you will contribute to the development and scalability of our top-tier mobile applications, ensuring an uninterrupted and high-performance experience for our diverse user base. This position is based in our London office with a hybrid work arrangement, typically requiring three days in the office.Explore our Engineering team to learn about what motivates us, our collaborative work environment, and what you can expect from us.Your ResponsibilitiesAs a member of the Consumer Tech team, you will focus on the complete customer journey—from the moment they launch the app to when their meal arrives—ensuring each interaction is seamless, quick, and dependable.Your daily activities will include:Lead technical execution by designing, developing, and scaling Android applications that manage complex, real-time interactions on a global scale.Enhance architectural frameworks and conduct code reviews to ensure the maintainability, visibility, and operational health of our mobile codebase.Collaborate with cross-functional teams (PMs, Experience Designers) to plan projects, guide technical decisions, and influence the team’s roadmap.Take ownership of large-scale features from conception to delivery, streamlining maintenance and ensuring operational readiness across our production systems.Foster the development of team members by mentoring peers, promoting efficiency, and actively participating in the engineering hiring process.What We’re Looking ForThe ideal candidate will possess substantial expertise in several of the following areas, with an eagerness to expand their knowledge in others:Extensive experience in developing Android applications, showcasing a robust understanding of the platform and its ecosystem.

Join Spotify as a Senior Android Engineer within our innovative Data Platform team. In this role, you will leverage your extensive Android development experience to enhance our data services and deliver optimal user experiences. You will collaborate with cross-functional teams, including product managers and data scientists, to design and implement robust solutions that support our growing user base.

About xAIAt xAI, our mission is to develop AI systems that accurately comprehend the universe and support humanity’s quest for knowledge. Our dedicated team is small yet highly driven, focused on achieving engineering excellence. We invite individuals who are eager to challenge themselves and thrive on curiosity. Embracing a flat organizational structure, we encourage hands-on contributions towards our mission. Initiative and consistent excellence are rewarded with leadership opportunities. Strong communication skills are essential for sharing knowledge concisely and effectively with team members. About the RoleWe are on the lookout for a talented Android engineer to join our impactful team focused on developing the most valuable AI application in the world, defined by the positive effect it has on users. You will have the opportunity to craft innovative mobile experiences, merging technical expertise with a strong product vision to create outstanding solutions that resonate with users.Your responsibilities will include tackling critical product or technical challenges at any given time.

About the Team Join SumUp's Mobile Platform Squad as a Senior Android Engineer and play a pivotal role in the development of our rapidly expanding Android ecosystem. With substantial investments in our flagship products, we empower our feature teams to create world-class experiences. You will be crucial in establishing a robust foundation that allows over 40 Android engineers to maximize their productivity and efficiency, directly influencing the future of mobile payments for millions of merchants. Our engineering culture promotes autonomy, collaboration, and innovation. Your contributions will have a significant impact, connecting mobile engineers across the organization. This role is vital for: Eliminating Bottlenecks: Strategically addressing and resolving critical bottlenecks in CI/CD pipelines and app infrastructure that may hinder the delivery of new features and enhancements. Enhancing Developer Experience: Designing and implementing state-of-the-art tools and infrastructure that markedly improve the developer experience, reduce build times, and streamline workflows for our extensive Android engineering team. Modernizing a Mature Codebase: Leading the evolution and enhancement of our Android codebase, with an emphasis on code simplicity, maintainability, and overall health across all SumUp Android products. Ensuring Product Stability & Scalability: Offering foundational support and guidance across our diverse Android product portfolio, ensuring consistency, reliability, and smooth operation for products such as Register, Android Terminal, SumUp Go, and the Merchant app. What You’ll Do: Strategic Impact: Lead initiatives to shape the core experience for both merchants and our internal Android developers, directly contributing to SumUp's ambitious Android product roadmap. Technical Leadership: Architect, develop, and maintain critical tools, frameworks, and infrastructure that significantly enhance the consistency, scalability, and reliability of our mobile applications, ensuring no adverse effects across our various Android products. Performance & Efficiency: Drive initiatives in CI/CD systems, advanced developer tooling, and performance optimizations to dramatically streamline mobile development processes and reduce build times for our expanding team. Codebase Evolution: Proactively address technical debt, enhance code health, and introduce best practices to a complex, mature codebase, ensuring its long-term viability.

About JuniorAt Junior, we are at the forefront of innovation, creating powerful LLM-driven tools designed to enhance the investment research experience for private market investors. Our esteemed clientele includes several of the world's top 10 private equity and consulting firms, collectively investing billions of dollars each year. As a profitable, bootstrapped company, we have a thriving team of 28 professionals located in both London and New York City. Notably, we achieved a remarkable 10x revenue growth in 2025. Role OverviewJunior has positioned itself as the premier AI platform for consulting and private equity teams at leading firms globally. Following our 10x growth last year, we aim to triple our success this year.1) Development of GTM Systems (Core)Manage the lead → account → opportunity workflow, focusing on stages, fields, and rules.Automate processes related to routing + hygiene (deduplication, enrichment, stage/task updates).Establish consistent cadences for pipeline reviews, next-step follow-ups, and stale/renewal alerts.Ensure Attio serves as the single source of truth for definitions, naming conventions, and required fields.Create targeted and semi-templated content (such as deal-specific one-pagers and demo workspaces).2) RevOps Processes, Automation & ToolingImplement automations across platforms including Claude Co-work, Attio, Slack, email, and calendar.Oversee legal and information security processes, enhanced by cutting-edge AI tools.Maintain straightforward dashboards tracking inbound speed, conversion rates, outbound pipeline, and pilot health.Conduct monthly operational sweeps to resolve issues, simplify processes, and introduce further automation.3) SDR Execution (Targeted)Engage in prospecting and outbound initiatives targeting our ideal customer profile through Clay, LinkedIn, and Superhuman.Continuously refine high-converting messaging and outreach sequences.Schedule and qualify meetings, ensuring clear next steps are logged in Attio.Develop repeatable outbound strategies (including lists, triggers, and collateral).4) Experiments & Growth OperationsConduct 2–4 GTM experiments per month.Analyze results and convert successful strategies into SOPs and playbooks. About You2-4 years of experience in RevOps, Sales Ops, or Growth Ops.Strong analytical skills with a data-driven approach.Proficiency in automation tools and CRM systems.Excellent communication and interpersonal skills.A proactive mindset with a passion for experimentation and growth.

About JuniorAt Junior, we are revolutionizing the investment research landscape with state-of-the-art LLM-powered tools designed specifically for private market investors. Our clientele includes some of the world's leading private equity and consulting firms, collectively managing billions in annual investments. As a profitable and bootstrapped organization, we take pride in our dynamic team of 24 based in both London and NYC.Discover more about our mission and values here. Role DescriptionAs a pivotal member of our Customer Success team, you will play a crucial role in ensuring our clients' success. We seek individuals who possess genuine empathy for the challenges faced by consultants and investors during due diligence work, and who can effectively demonstrate how Junior can enhance their efficiency and impact.Your responsibilities will include managing global deployments involving thousands of users, acting as the Voice of the Customer, and collaborating closely with our product team to eliminate pain points from our customers' workflows.In this role, you will:Develop and maintain robust relationships with clients, including key decision-makers at large-cap funds and consultancies, serving as their primary contact and trusted advisor throughout the onboarding and feedback processes.Oversee the execution of large-scale AI deployments for thousands of users.Transform customer feedback into actionable insights for product development, guiding our team on essential features to meet client demands.Co-create and deliver tailored training programs alongside our customers.Utilize data-driven strategies to enhance customer engagement, satisfaction, and retention.Advance into a managerial position as our Customer Success team expands.Contribute to the evolution of our team structure and the overall company culture. About YouWe are in search of a seasoned Customer Success Lead who:Has demonstrable experience in customer success roles, especially within the investment or consulting sectors.Is skilled in relationship management, with a track record of engaging effectively with senior stakeholders.Possesses strong analytical skills and the ability to leverage data for customer insights.Can effectively communicate and translate customer needs into product enhancements.Is passionate about driving user satisfaction and retention.

About JuniorAt Junior, we are at the forefront of innovation, developing advanced LLM-powered workflow tools designed to enhance investment research for private market investors. Our esteemed clientele includes the majority of the top 10 global private equity and consulting firms, and we currently facilitate the investment of hundreds of billions of dollars annually. As a profitable and bootstrapped company, we are proud to have a dynamic team of over 30 professionals based in London, New York City, and Sydney, achieving a remarkable 10x revenue growth in 2025.Explore more about our mission and values here. Role OverviewWe are searching for our inaugural Product Marketing Lead to define our positioning, messaging, and marketing strategies for Junior, targeting the world's most discerning enterprise software buyers. You will act as a vital link connecting our state-of-the-art AI product with decision-makers at prestigious consulting firms and private equity funds.In this pioneering role, you will have the chance to:Lead product launches and messaging for feature releases: Ensure new features are effectively communicated to the right audience, helping users maximize their value from Junior.Develop our content strategy: Create engaging case studies, thought leadership articles, and sales enablement resources that demonstrate tangible ROI.Shape our go-to-market strategy: Develop impactful messaging that stands out in the crowded AI landscape and resonates with sophisticated buyers by deeply understanding customer segments, market dynamics, and decision-making personas. About YouWe are looking for a strategic product marketer who possesses:5+ years of B2B product marketing experience, ideally within enterprise software, AI/ML platforms, or technology services.A deep understanding of complex sales cycles, with experience engaging sophisticated buyers who navigate 3-9 month decision-making processes involving multiple stakeholders.Fluency in AI/LLM products, with the ability to articulate the technological shifts we are experiencing and create compelling messaging around customer use cases.A tinkerer’s mindset: Experimentation with LLMs and AI tools, showcasing several examples of processes developed or improved through generative AI.

About FreetradeAt Freetrade, our vision is to simplify investing and make it accessible to everyone. By removing the complexities and high costs associated with investing, we empower millions to maximize their savings.Join us as we transform the investment landscape!We are expanding our team and seeking individuals who are eager to redefine the investment journey for our customers. If you are passionate about solving intricate problems and developing cutting-edge products, you will thrive in our environment.2026 is set to be a transformative year for us. Following our groundbreaking partnership with IG Group, we will continue as an independent entity while benefiting from the backing of a market leader.This year, we are ramping up our product development, introducing exciting features such as mutual funds, bonds, and family investment tools. We are also investigating how AI can enhance customer experiences.If you want to expand your technical expertise, develop new products, and work in a creative and innovative environment, this is the perfect opportunity for you!Why Join Our Engineering Team?Be part of a team that is revolutionizing the investment sector. As a Mobile Engineer, you will play a crucial role in creating and sustaining a scalable platform utilized by thousands daily. We embrace technical challenges, foster innovation, and provide solutions that truly matter. Here, your code will impact investors across the UK. Join us to turn your ideas into reality.The Freetrade Android application offers customers easy access to various investment opportunities in the UK, US, and EU markets.We are seeking a Mobile Engineer (Android) to join our dynamic team at Freetrade.This role requires a solid understanding of the Android platform, strong problem-solving abilities, and a commitment to skill enhancement while collaborating within a team-oriented environment.This is a unique chance to collaborate with experienced mobile engineers across both iOS and Android, enhancing your skills significantly.As part of our mobile engineering team, you will work on implementing new features while ensuring high customer satisfaction by addressing user queries and feedback. Collaborating with design, product, and QA teams, you will create user experiences that delight our customers.

Hypersonica develops advanced defence technology across Europe, with a focus on speed, resilience, and strengthening technological independence. The company values technical excellence and seeks people who approach complex problems with creativity and urgency. Role overview This Junior Systems Engineer position is based in London and sits within a close-knit, skilled team. The role involves hands-on work on projects that influence the future of defence technology. Junior engineers here contribute directly to Hypersonica’s mission and ongoing growth. What makes this role unique Collaborate with experienced professionals in an environment where each team member’s work matters Tackle meaningful challenges and help develop quick, effective solutions Shape the position over time by drawing on your own strengths and interests Support projects that advance Europe’s technological autonomy Who succeeds at Hypersonica People with strong technical abilities and sound judgment Those who thrive both independently and within a team Candidates who have achieved results that others considered unlikely, or who bring a unique mix of skills Individuals ready to take on evolving responsibilities as their contributions grow Applicants with unconventional backgrounds or skills are encouraged to apply, especially if they have a record of delivering results in demanding situations.

Join Us as a Mid/Senior/Staff Android Engineer in London!Relocation and visa support are available if required, but candidates must currently be located in the United Kingdom or Europe.Bring Your Best Work to LifeAt Trade Republic, we are Europe's leading savings platform, operating across 18 countries and serving over 10 million customers who have entrusted us with more than 150 billion in assets. Our mission is ambitious: to empower everyone to build wealth through easy, safe, and free access to financial systems.As part of our team, you will collaborate with top talents and cutting-edge technology, contributing to a positive and lasting impact for millions of users.Your Role and ResponsibilitiesLeverage your expertise to enhance the Android guild, ensuring technical excellence across the board.Mentor fellow engineers while receiving guidance from a coach to foster your professional growth.Take ownership of product development by collaborating with various roles to ensure quality and timely delivery.Thrive in a dynamic, goal-oriented agile environment.What We SeekA minimum of 5 years of experience in software engineering, preferably within the JVM ecosystem.Proven experience in developing and launching scalable features within a service-oriented architecture.A strong commitment to delivering reliable and maintainable software through iterative development and continuous delivery practices.Experience in building platform services that accelerate product development; prior experience in platform-focused teams is a plus.Our Android Tech StackNative Android application development using Kotlin.Reactive programming frameworks: RxJava2, Kotlin Flow.Architecture patterns: MVVM.Jetpack Compose for UI development.Dependency Injection with Anvil.Why You Should Apply TodayWe cultivate a culture of ownership, excellence, and high energy. We hold ourselves accountable to achieving impactful outcomes, tackling one of the biggest challenges facing Europeans today—closing the pension gap and democratizing wealth. If this resonates with you, we invite you to reach out!

Join our innovative Client Platform team at Spotify, an R&D studio dedicated to enhancing the productivity of client developers. Our mission is to optimize performance and stability across the Spotify applications, ensuring that users enjoy an exceptional experience.We achieve this by offering advanced observability and tools that capture critical performance metrics and stability data, presenting it to feature squads in a clear and actionable format. Our collaborative approach involves working closely with internal stakeholders to comprehend their needs and create a platform that seamlessly integrates with their workflows. Occasionally, we partner directly with feature squads to implement our tools and pinpoint areas for improvement within the app.Currently, we are developing the next-generation observability platform that consolidates various client observations into a unified view, empowering engineers to diagnose issues in real-time, identify bottlenecks, and effectively address bugs and regressions.

Join Trainline as a Junior Data Engineer and embark on an exciting journey to revolutionize the rail travel experience through data-driven solutions. In this role, you will collaborate with a dynamic team of professionals, utilizing cutting-edge technologies to manage and optimize our data infrastructure. Your contributions will directly impact our mission to simplify rail travel for millions of customers.