Junior Ruby Engineer - London

Join our dynamic team at Trainline as a Junior Ruby Engineer! This is an exciting opportunity for those looking to kickstart their career in software development. You will collaborate with a talented group of engineers to design, develop, and maintain innovative applications that streamline travel for millions of users.As part of our London-based team, you will be immersed in a culture of learning and growth, where your contributions will have a real impact on our products and services. We are looking for a passionate individual who thrives in a collaborative environment and is eager to learn from experienced developers.

About JuniorAt Junior, we are on a mission to revolutionize the investment research landscape with innovative 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 enterprise, we have grown our team to 24 talented individuals across our London and NYC offices, and we achieved a remarkable 10x revenue growth in 2025.Discover more about our mission and values here. Role DescriptionAs our first dedicated Backend Engineer focused solely on our internal go-to-market and operations stack, you will play a pivotal role in shaping our technology framework. Your responsibilities will include:Crafting an AI-first tech stack from the ground up, influencing infrastructure decisions and priorities.Rapidly deploying internal tools and receiving immediate feedback from your team members, who will quickly become your strongest advocates!Developing and managing our data warehouse and internal data architecture.Engaging in innovative projects that leverage LLMs, automation, and advanced agent technologies.Cultivating our engineering culture. Sample Set of ProjectsUser Health Reporting + CRM Data Quality: Automate data pipelines to enhance metrics visibility in BI dashboards and ML evaluations, while establishing alert systems for risk signals.User Feedback Integration: Develop a tool that summarizes user feedback calls, prioritizes feature requests, and communicates findings to our Product team.Billing and Invoicing: Implement complex B2B pricing models encompassing usage-based, seat-based, and platform fees, while automating financial reconciliation processes.Data Warehouse Development: Create a data warehouse to integrate product, CRM, and operational data, and generate tailored dashboards for different teams. About YouWe are searching for a backend/data engineer who...

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.

Join our vibrant and dynamic team at Billetto, where the principle of 'freedom with responsibility' drives our innovative work culture. Our tech team comprises a diverse group of passionate hackers, all dedicated to the startup ecosystem. We embrace the latest technologies and utilize tools that inspire us. If you're eager to dive into the startup world and gain hands-on experience while contributing to a fast-growing company, you've found the perfect opportunity.Your role will encompass a spectrum of backend responsibilities, including Ticketing, Reporting, and Social Event Discovery.We provide a competitive salary along with a range of benefits, all within our centrally located London office.

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.

Ruby DeveloperAbout UsAt New Route Recruitment Limited, we are dedicated to transforming the childcare landscape in London. Our mission is to provide families with easier and more affordable access to flexible and high-quality childcare solutions. With the backing of renowned investors, including prominent VCs who have supported successful companies like Wonderbly, Thread, and Appear, we are proud to have been awarded ‘Best Technology’ at the Business Women Awards in 2017 and are currently shortlisted for several prestigious awards, including Startups ‘Tech Business of the Year’.Role OverviewJoin our innovative team as we develop a marketplace that connects families with exceptional nannies. As a Ruby Developer, you will play a crucial role in designing and implementing technology that simplifies complex matching processes, ensuring that both families and nannies receive seamless solutions. Your contributions will also enhance our recruitment and training initiatives for nannies.Technical EnvironmentIn this position, you will primarily work with Ruby on the backend, utilizing frameworks and technologies such as Rails, PostgreSQL, and Redis. Our frontend development employs modern tools, including ES6 and Tachyons. You will engage with GitHub for pull requests and code reviews, ensuring that our CI/CD pipeline with CircleCI is well-maintained before deployment. Most of our deployments occur on Heroku, with some operations on AWS. We prioritize using the most suitable tools for our tasks and are open to adapting our tech stack as necessary.Product DevelopmentOur product is continuously evolving as we build impactful features that drive significant improvements. Instead of following a lengthy product roadmap, we adopt short development cycles to validate assumptions and make informed decisions quickly. We prefer using feature flags over staging environments, deploying code to production frequently to optimize value delivery. As part of our engineering team, you will collaborate closely with product and operations teams to identify and develop innovative solutions for business challenges, ensuring maximum value for our customers.Candidate ProfileWe welcome applications from Junior, Mid-Level, or Senior developers who thrive in dynamic, fast-paced engineering environments.Key Qualifications:Proven experience in web application developmentFamiliarity with relational databases and SQLA commitment to writing clean, well-structured, and thoroughly tested codeA willingness to engage in pair programming and participate in a collaborative code review culture

Join Tracer as a Junior Engineer and kickstart your career in engineering. This exciting role offers the opportunity to work on innovative projects while collaborating with a talented team in a dynamic environment. You will contribute to the development of cutting-edge solutions, gaining hands-on experience and advancing your skills in the engineering field.

Join our innovative team at Upbeat Ideas UK Ltd as a Senior Ruby Developer. In this role, you will leverage your extensive experience in Ruby on Rails to design and develop scalable web applications that enhance our client's digital presence. You will collaborate with cross-functional teams, ensuring high-quality code through best practices and effective testing methodologies.We are looking for a creative problem-solver who thrives in a fast-paced environment and is passionate about technology and user experience.

Join our innovative team at Upbeat Ideas UK Ltd as a Senior Ruby Developer. We are looking for an experienced developer who is passionate about building high-quality applications using Ruby on Rails. You will play a crucial role in designing, developing, and maintaining scalable web applications that enhance user experience and drive business success.The ideal candidate will have a strong background in software development, a knack for problem-solving, and the ability to work collaboratively in a dynamic environment.

Fraud Alert:At Sensor Tower, we prioritize your safety during the application process. To be considered for a position, please apply exclusively through our official website or directly through recognized platforms like LinkedIn, Indeed, BuiltIn, or Hackajob. We will never request payment or sensitive information such as credit card or bank details for job applications. All communications from us will originate from email addresses ending with sensortower.com. Interviews will be conducted via phone or Zoom, and no communication will occur through unverified email or text. If you encounter any suspicious activity, please let us know. Remember to attach your resume when applying.Recruitment Agency Notice:Sensor Tower does not accept unsolicited resumes from third-party recruitment agencies. Please refrain from sending resumes to our job alias, employees, or any other company locations. Sensor Tower will not be liable for any fees related to unsolicited resumes and will only pay agencies with a signed agreement.Role Overview:We are on the lookout for a talented Back End Engineer to join our team. You will play a crucial role in scaling our database operations and managing vast amounts of data (up to tens of terabytes). Your creativity and technical skills will be essential in deriving valuable insights and data.As a member of the Sensor Tower engineering team, you will contribute to developing top-notch products and features that enhance our user experience. In our agile and flat organizational structure, your input will directly influence the direction and execution of our projects.A Day in the Life:Interviewee: Engineering Team Lead - Sasha YelkovenkaDescribe a typical day as a Software Engineer.My role involves working extensively with large datasets, which are continuously growing. My primary responsibility is ensuring our customers can access this data swiftly and providing them with user-friendly tools for data utilization. I appreciate the culture of ownership at Sensor Tower.How do you collaborate with your remote team?We foster an excellent remote work environment, frequently collaborating via Zoom to leverage each other's expertise for improved outcomes.

Our MissionAt Omnea, we are transforming the way enterprise businesses function, focusing on the most challenging aspects: procurement. Here, a single purchase can extend for months, entail over 50 emails, and involve multiple departments such as Finance, Legal, Security, and IT just for approval.With an investment of $75M from Khosla Ventures, Insight Partners, and Accel, we aim to revolutionize this process. Our AI-driven platform integrates all stakeholders, ensuring that buying is swift, secure, and efficient. It offers a centralized location for requests, automated approvals and renewals, real-time supplier risk assessment, and complete visibility into spending.The procurement sector represents a $7B+ untapped market, and our growth underscores the opportunity: we have increased our annual recurring revenue (ARR) tenfold to double-digit millions within just 18 months and gained the trust of large enterprises like Spotify, MongoDB, Monzo, and Albertsons. We are now recognized as the 4th fastest growing startup in Europe.Our team previously scaled Tessian (a leading cybersecurity technology company supported by Sequoia, Balderton, and Accel, acquired after Series C), comprising ex-founders and operators who have successfully grown unicorns, delivered top-tier products, and achieved outstanding execution. You will collaborate with industry leaders including Ben, Abs, Sabrina, and Rebe.What We're Looking ForWe seek talented, product-focused full-stack software engineers to drive Omnea's next growth phase.In the past 18 months, we have accelerated our revenue tenfold, tripled our customer base, and maintained a retention rate exceeding 99% with enterprise clients such as Spotify, Wise, Albertsons, Adecco, and McAfee. Our talent standards are exceptionally high — it took over 10,000 interviews to recruit our first 50 team members. We are now expanding from a low double-digit count to over 200 enterprise clients, aiming for another tenfold increase in revenue in the next 2 to 3 years.This is an exciting opportunity to join us at a pivotal moment: we have achieved product-market fit, yet there is still ample room for you to influence our trajectory.

Join our dynamic team at bbc-maestro, a leading SME with a global clientele, as a Senior Full Stack Engineer. Your primary mission will be to enhance and maintain our core platforms while collaborating with a talented group to craft scalable software that truly resonates with our users.In this role, you will actively engage in building and maintaining our Ruby on Rails platform and React Native mobile app infrastructure. You will also play a pivotal role in shaping our technical direction, mentoring your teammates, and ensuring high-quality delivery.This position is ideal for individuals who thrive in environments that encourage autonomy, love tackling real-world user challenges, and wish to have a hand in guiding technical decisions while remaining immersed in coding.You will report directly to our Engineering Manager.

Join Our Team as a Ruby on Rails Developer!Location: London (Proximity to Liverpool Street Station)We are on the lookout for a talented Mid to Senior Ruby Developer to drive growth in our innovative property technology firm.At our company, we serve as the leading information hub for the Real Estate sector, connecting professionals with vital company insights through our advanced digital platform.We are proudly backed by esteemed angel investors from the Real Estate field and are experiencing rapid growth:Over 17,000 members and 450+ companies contributing content on a global scale, utilized by industry professionals worldwide.What We’re SeekingWe require a Ruby Developer with a strong background in the following technologies:Proficiency in Ruby on Rails and/or Sinatra, API Integration with REST, Git, RabbitMQ, Microservices Development, CI/CD, PostgreSQL, Test-Driven Development, and AWS.What We OfferWe provide a competitive compensation package, tailored to your skills and experience as a Ruby on Rails Developer:·Attractive salary·Equity in the company·Pension plan·Flexible working hours·Regular team-building activities·A fun and dynamic workplace·Shorter working hours during summer months

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.

At OakNorth, we are dedicated to empowering the UK's most ambitious enterprises. Since our inception in 2015, we have successfully lent over $21 billion across the UK and the US, contributing to the creation of more than 58,000 new homes and 36,000 jobs, while supporting hundreds of thousands of personal savers and bolstering the UK economy.We are on the lookout for Junior Software Engineers, particularly recent Computer Science graduates or those in the early stages of their development careers. You will become a part of our innovative AI-native engineering team, where small, highly autonomous pods operate in a groundbreaking manner. Alongside your peers, you will engage in the complete product development lifecycle—designing, building, testing, and deploying—within a highly independent team structure.This initiative represents a pivotal shift in our development practices at OakNorth, placing you at the forefront of technological innovation.Your role will involve pushing the boundaries of modern AI tools and transforming those capabilities into effective systems utilized by real teams. We are seeking curious creators—individuals who naturally test, compare, break, rebuild, and optimize. Your contributions will be instrumental in shaping the AI-native engineering culture within the bank, with a strong emphasis on execution: rapid prototyping, deployment, and measurable impact.

About JuniorAt Junior, we're innovating at the forefront of investment research with our state-of-the-art LLM-powered tools. Our mission is to empower the world's most discerning deal teams, including some of the top 10 global private equity firms, Big 4 professional services, and leading consulting practices, who collectively manage billions in investments annually.As a profitable, bootstrapped company, we've grown our team to approximately 28 dynamic individuals across our London and New York offices. Following a remarkable 10x revenue increase in 2025, we are poised for another thrilling growth phase, aiming to double or triple our success this year. Our clients benefit significantly, saving an average of 10 hours per diligence weekly, as we facilitate their deal workflows. The RolePrivate equity is where we excel. We've established a robust product-market fit, with firms leveraging Junior for their due diligence, expert consultations, and portfolio management processes. Our ambition is to onboard 20-35 new private equity customers this year, and this role is crucial in propelling that growth.You will engage with CTOs, CCOs, Managing Directors, and Heads of Portfolio Operations within mid-market and top-50 PE firms, guiding them through consultative sales cycles. This role demands an understanding of technical solutions and the ability to navigate complex stakeholder environments. Deal values range from $100k to $2M ACV, encompassing security assessments, compliance reviews, and firm-wide implementation strategies.This is not just order fulfillment; you will actively seek new opportunities, construct tailored account strategies, and finalize sophisticated enterprise agreements in a market where our product has already gained notable traction. As an Account Executive, you will have the unique opportunity to:Hunt and close new logos within the private equity sector, focusing on enterprise deals ranging from $100k to $2M ACV.Develop and execute comprehensive account plans for targeted firms, identifying CTOs, Heads of Portfolio Operations, deal leads, and other essential contacts.Conduct discovery sessions and product demonstrations with senior finance professionals, articulating Junior's value in the context of due diligence, expert networks, portfolio monitoring, and deal execution.Overcome complex enterprise procurement hurdles: including security evaluations, data residency stipulations, IT integration, and planning for organization-wide rollouts.Craft and present a compelling value proposition and ROI framework tailored to PE workflows, illustrating how Junior can save clients significant time and resources.

Your impactful mission. As a Junior Game Developer, you will...Design and implement high-performance game simulations utilizing our proprietary libraries and tools to validate and test intricate mathematical models.Provide game producers with the essential tools, data, and insights necessary to create successful gaming experiences.Analyze and report statistical data derived from extensive sample sets of billions of games.Develop game prototypes to explore and enhance innovative game concepts.Create technical specification documents that articulate and clarify complex models in a precise manner.

Position Overview: Join our dynamic team at Squarepoint Capital as a Junior UX/UI Engineer. We are seeking a creative technologist who marries exceptional design capabilities with a robust foundation in front-end development. In this exciting role, you will collaborate closely with our team to design and implement intuitive user experiences for our web-based trading and enterprise platforms. You'll be instrumental in translating complex, data-rich interfaces into engaging designs using Figma and React. Your coding skills will allow you to work effectively alongside engineers, keeping technical constraints in mind while contributing to front-end development when necessary. This is a remarkable opportunity to evolve into a well-rounded UX/UI Engineer, enhancing your design expertise and engineering skills in a fast-paced financial technology space. You'll be involved in the full product development life cycle—from conceptualizing ideas to delivering polished outputs, iterating based on user feedback and technical limitations, and performing QA testing before launch.

Join Advancy as a Junior Consultant (Full-time)As a Junior Consultant at Advancy, you will be seamlessly integrated into diverse projects, contributing to in-depth analyses and impactful deliverables while receiving mentorship from your immediate supervisors, including Consultants and Senior Consultants.We are looking for candidates who are equally comfortable with quantitative and qualitative tasks, exhibit agility and curiosity, and thrive in a dynamic, fast-paced environment.Your daily responsibilities will include:Identifying objectives and gathering data from various sources to address complex business challenges.Designing and executing quantitative analyses that enhance the client's market positioning and growth strategy.Actively participating in the creation of deliverables throughout project lifecycles.As a Junior Consultant at Advancy, you can expect:Direct engagement with senior management at prestigious global firms.Involvement in stimulating and challenging projects as a proactive team player.A meritocratic culture that encourages participation in projects across our global offices.Comprehensive training and skill development through an intensive program at our Paris headquarters.We offer a competitive remuneration package, featuring a generous base salary, a 6% employer pension contribution, annual bonuses (at the company's discretion), and exciting benefits!

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.