[![Image]() Meet Jobicy Copilot — free AI autofill for job applications + remote job alerts ›](#) [All remote jobs](https://jobicy.com/jobs.md)Open role[![Capital on Tap logo](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2025/06/88542615-221.jpeg)](https://jobicy.com/company/capital-on-tap.md)Remote opportunity at[Capital on Tap](https://jobicy.com/company/capital-on-tap.md) # Senior Software Engineer Review the role, location requirements, compensation details, and application process before deciding whether this opportunity fits your next career move. [Apply for this job](#job-application)[View company](https://jobicy.com/company/capital-on-tap.md)Share12 Sep 2026Published52Listing views3Application actions12 Oct 2026Apply before Opportunity details ## About this role. AI SummaryCapital on Tap is hiring a Senior Full Stack Engineer to help build credit-card, payments, and spend-management products for small businesses. The engineer will develop scalable .NET services and React user interfaces, own work through the full software development lifecycle, and maintain strong unit and integration testing. The position begins fully remote and will transition to a hybrid arrangement with two days per week on site in Lisbon. The role requires at least five years of hands-on experience with C#, .NET Core, SQL Server, and ideally JavaScript and React. It is a founding-engineering opportunity for the new Lisbon office, with meaningful ownership and collaboration across product, QA, and engineering. ## Role DNA A quick view of the complexity, pace, ownership and collaboration implied by the job description. ### Job Complexity 4/5EasyHard ### Pace & Pressure 4/5RelaxedFast-paced ### Autonomy Level 4/5GuidedFull ownership ### Communication Load 4/5IndependentCollaborative AI insightThis is a senior full-stack role requiring production ownership across backend services, responsive frontend development, databases, testing, troubleshooting, and continuous improvement. The founding-team setting and fintech product domain increase the need for sound judgment, proactive execution, and reliable cross-functional communication. ## Salary analysis Estimated compensation compared with the broader EU market for similar roles. Estimated job medianBelow market€62,500EU market range€130k–€180k0€198k AI insightThe disclosed offer is €55,000–€70,000 per year, with a midpoint of €62,500 annually. The estimated US market range for a senior full-stack software engineer with .NET, React, cloud, and fintech-relevant experience is approximately $130,000–$180,000 per year; this US range is an estimate and is not a conversion of the Portugal-based offer. ## Core skills Skills and capabilities most closely associated with this opportunity. [C#](https://jobicy.com/jobs?search_keywords=C%23.md)[.NET Core](https://jobicy.com/jobs?search_keywords=.NET%20Core.md)[React](https://jobicy.com/jobs?search_keywords=React.md)[JavaScript](https://jobicy.com/jobs?search_keywords=JavaScript.md)[SQL Server](https://jobicy.com/jobs?search_keywords=SQL%20Server.md)[MongoDB](https://jobicy.com/jobs?search_keywords=MongoDB.md)[Azure](https://jobicy.com/jobs?search_keywords=Azure.md)[Google Cloud Platform](https://jobicy.com/jobs?search_keywords=Google%20Cloud%20Platform.md)[Unit Testing](https://jobicy.com/jobs?search_keywords=Unit%20Testing.md)[Integration Testing](https://jobicy.com/jobs?search_keywords=Integration%20Testing.md) Sample interview questionsHow would you design a scalable .NET service for processing credit-card payment events?I would define clear domain boundaries, expose idempotent APIs, and use durable event handling with retries and dead-letter processing. I would persist transactional state in a reliable database, add observability through structured logs and metrics, and protect sensitive data through appropriate access controls and tokenization. I would also build automated unit, integration, and failure-path tests before production rollout. Describe how you ensure quality when delivering a full-stack feature in React and .NET. I start by agreeing on acceptance criteria and API contracts with Product and QA. I cover backend business rules with unit tests, validate integrations such as persistence and API behavior with integration tests, and build focused component or end-to-end coverage for critical frontend journeys. Before release, I use code review, monitoring, and post-release checks to catch regressions quickly. What steps would you take to troubleshoot a production performance issue involving a slow SQL Server query? I would first use metrics, traces, and query execution plans to identify the affected endpoint and the actual query bottleneck. I would check indexes, joins, filtering, row counts, locking, parameter behavior, and any recent schema or application changes. After validating an improvement in a safe environment, I would deploy carefully and monitor latency, errors, and database load to confirm the result. How do you make technical decisions when requirements are incomplete or ambiguous? I clarify the user outcome, constraints, risks, and success measures with relevant stakeholders, then document practical options with trade-offs. For uncertain assumptions, I prefer a small proof of concept or incremental delivery path that generates evidence quickly. I communicate the decision clearly so product and engineering partners understand both the rationale and any follow-up risks. How would you approach joining a founding engineering team in a new office? I would focus on building trust, learning existing engineering standards, and contributing to a collaborative working rhythm from the start. I would share knowledge through thoughtful reviews, documentation, pairing, and constructive technical discussions while taking ownership of deliverables. As the team grows, I would help establish sustainable practices around quality, delivery, onboarding, and communication. We’re Capital on Tap 👋 💳 Capital on Tap started because small businesses were underserved. Big banks were slow, their products weren’t fit for purpose, and small business owners often couldn’t access what they needed. We set out to fix that. Today we’re a financial platform – not just a credit card company. We offer a best-in-class business credit card, SME-focused spend management platform, a savings product that hit £1 billion in funds within its first year, and a growing suite of tools and financial products that make running a small business easier. 1,000+ employees, £20bn in annual card spend, 200,000+ customers, 17,000+ Trustpilot reviews averaging 4.7 stars, and we’re profitable. We’ve done a pretty good job so far, but we’re just getting started! We opened our first Portuguese office in Porto in autumn 2025, and in less than a year it has grown to a team of 50. Lisbon is the next step. We’re opening our first office in the city and looking for engineers to join as founding members of the team, helping shape how we build, hire and work here from day one. 🏡🏢 The role starts out fully remote. Once our Lisbon office is open, it will move to a hybrid set-up of two days a week on site. Salary: €55,000-70,000 This is a multiple-headcount role, so please don’t be put off if you’ve seen it advertised for a while. What You’ll Be Doing We’re looking for Senior Full stack Engineers to help us build the best credit card and payment products for small businesses. If you’re looking for an environment where you’re given the freedom to make empowered decisions, research new technologies, and learn/share knowledge with your peers. Then keep on reading! * You’ll build robust and scalable solutions using .Net technology * From the first line of code to production, monitoring, and continuous improvement – you’ll own the SDLC * You’ll craft slick, responsive user interfaces with modern JavaScript frameworks (React), making sure our products don’t just work, they feel great to use * Teamwork makes the dream work – you’ll partner with Product Managers, QA’s, and fellow Software Engineers * You’ll build bulletproof unit and integration tests to keep our software sharp and our users happy * Bugs happen. When they do, you’ll be ready to troubleshoot and tweak as needed * You’ll bridge the gap between tech speak and business goals, ensuring everyone’s on the same page and moving forward together We’re Looking For 🔎 Required skills: * A minimum of 5+ years hands-on experience in C#, .Net Core, SQL Server, ideally JavaScript and React also! * Good testing practices, in both Unit and Integration testing * Good understanding of database technologies * Experience in using Agile development practices * A passion for learning new skills and technologies * A proactive, supportive, and collaborative team player Our Tech Stack * Backend: C#, .Net, .Net Core * Frontend: React, JavaScript * Mobile: Flutter, Dart * Databases: SQL Server, MongoDB * Cloud: Azure & GCP Interview Process 🤝 * First stage: 30-minute intro, CV review, and values with a Talent Partner * Second stage: 45-minute “Tech Chat” with a Team Manager * Final stage: 90-minute Code Pairing + 30-minute Values Interview Diversity & Inclusion 🌈 We welcome, consider and encourage applications from anyone who shares our commitment to inclusivity. Join us in creating a space where authenticity thrives, and everyone can do their best work. Great Work Deserves Great Perks Check out our benefits: 🏥 Private Healthcare through AdvanceCare 🎁 Anniversary Rewards (€280, €570, €860, 4-week fully paid sabbatical) 🏖️ 36 days holiday (inclusive of public holidays with public holidays carried over if they fall on a weekend) 📖 Annual Learning and Wellbeing Budget 💬 6 free therapy sessions per year 🍫 Free drinks and snacks in our offices Other Info 👍Check out our [‘Top Tips’ for interviewing.](https://www.capitalontap.com/en/blog/posts/acing-your-interviews-with-capital-on-tap/) ✔️Keep updated on new job opportunities by following us on [Linkedin](https://www.linkedin.com/company/capital-on-tap). 📧Email [careers@capitalontap.com](mailto:careers@capitalontap.com) if you have any questions. Excited to work here? Apply! If you’d like to progress your career within our fast growing, profitable fintech then click apply and we will aim to get back to you within 3 working days (during busy periods this could take up to 5 working days.) Show more [Apply now >](https://jobicy.com/jobs/153088-senior-software-engineer-8.md) * ![Upload CV](data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI2NSIgaGVpZ2h0PSI2NSIgZmlsbD0ibm9uZSIgeG1sbnM6dj0iaHR0cHM6Ly92ZWN0YS5pby9uYW5vIj48ZyBjbGlwLXBhdGg9InVybCgjQSkiPjxwYXRoIGQ9Ik0wIDBINjVWNjVIMFYwWiIgZmlsbD0iIzAyOWFlYiIvPjxnIGZpbGw9IiNmZmYiIHN0cm9rZT0iI2ZmZiIgc3Ryb2tlLXdpZHRoPSIyIj48cGF0aCBkPSJNMzMuMDQ5IDE1LjQ1NGExLjQzIDEuNDMgMCAwIDAtMi4wOTcgMGwtNy41NzkgOC4xNDdhMS4zOCAxLjM4IDAgMCAwIC4wOSAxLjk3MyAxLjQ0IDEuNDQgMCAwIDAgMi4wMDgtLjA4OGw1LjEwOS01LjQ5MnYyMC42MWExLjQxIDEuNDEgMCAwIDAgMS40MjEgMS4zOTdjLjc4NSAwIDEuNDIxLS42MjUgMS40MjEtMS4zOTd2LTIwLjYxbDUuMTA5IDUuNDkyYTEuNDQgMS40NCAwIDAgMCAyLjAwOC4wODggMS4zOCAxLjM4IDAgMCAwIC4wOS0xLjk3M2wtNy41NzktOC4xNDZ6TTE2Ljc2OSAzOC40YzAtLjc3My0uNjItMS40LTEuMzg1LTEuNFMxNCAzNy42MjcgMTQgMzguNHYuMTAybC4yMTUgNi4yMjljLjIyMyAxLjY4LjcwMSAzLjA5NSAxLjgxMyA0LjIxOHMyLjUxIDEuNjA3IDQuMTcyIDEuODMzYzEuNi4yMTggMy42MzYuMjE4IDYuMTYuMjE4aDExLjI4bDYuMTYtLjIxOGMxLjY2Mi0uMjI2IDMuMDYxLS43MDkgNC4xNzItMS44MzNzMS41ODktMi41MzggMS44MTMtNC4yMThDNTAgNDMuMTEzIDUwIDQxLjA1NSA1MCAzOC41MDNWMzguNGMwLS43NzMtLjYyLTEuNC0xLjM4NS0xLjRzLTEuMzg1LjYyNy0xLjM4NSAxLjRsLS4xOSA1Ljk1OGMtLjE4MiAxLjM3LS41MTUgMi4wOTUtMS4wMjYgMi42MTJzLTEuMjI4Ljg1My0yLjU4MyAxLjAzOGMtMS4zOTUuMTktMy4yNDMuMTkzLTUuODkzLjE5M0gyNi40NjJjLTIuNjUgMC00LjQ5OC0uMDAzLTUuODkzLS4xOTMtMS4zNTUtLjE4NC0yLjA3Mi0uNTIxLTIuNTgzLTEuMDM4cy0uODQ0LTEuMjQyLTEuMDI2LTIuNjEyYy0uMTg3LTEuNDEtLjE5MS0zLjI3OS0uMTkxLTUuOTU4eiIvPjwvZz48L2c+PGRlZnM+PGNsaXBQYXRoIGlkPSJBIj48cGF0aCBmaWxsPSIjZmZmIiBkPSJNMCAwaDY1djY1SDB6Ii8+PC9jbGlwUGF0aD48L2RlZnM+PC9zdmc+) ### Upload your resume now To unlock remote work opportunities and be discovered by global employers. This job listing has been manually reviewed by the Jobicy Trust & Safety Team for compliance with our posting guidelines, including verification of the company's legitimacy, accuracy of job details, clarity of remote work policy, and absence of misleading or fraudulent content. Next step ## Apply now. Follow the employer’s application method and review Jobicy’s safety guidance before sharing personal information. Keep exploring ## Related remote jobs. Matched by job category10 related opportunities[Software Engineering](https://jobicy.com/categories/engineering.md) [Browse all jobs](https://jobicy.com/jobs.md) * ![GiveDirectly logo](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2025/06/07307149-221.png) GiveDirectly Sep 12 ### [Chief Technology Officer](https://jobicy.com/jobs/153122-chief-technology-officer-2.md) GiveDirectly has delivered more than $1B in cash directly to 2+ million people living in poverty across 15 countries since 2011. We believe cash transfers are one of the most… * ![Actian logo](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2026/06/0fee3ec4-221.webp) Actian Sep 12 ### [Tech Lead [gn] Feature Team](https://jobicy.com/jobs/149046-tech-lead-gn-feature-team.md) We are looking for a highly technical, hands-on Tech Lead to guide a small feature team of 3 to 4 engineers. We are not looking for an administrative manager who… * ![Actian logo](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2026/06/0fee3ec4-221.webp) Actian Sep 12 ### [QA Automation Lead [gn] Data Intelligence](https://jobicy.com/jobs/149048-qa-automation-lead-gn-data-intelligence.md) The QA Automation Team is the ultimate guardian of our platform’s reliability, scalability, and deployment velocity. In a complex, data-heavy ecosystem, manual testing is a bottleneck; continuous, intelligent, and bulletproof… * ![Actian logo](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2026/06/0fee3ec4-221.webp) Actian Sep 12 ### [AI Enablement Lead [gn] Data Intelligence](https://jobicy.com/jobs/149049-ai-enablement-lead-gn-data-intelligence.md) The AI Enablement Team is the catalyst for internal transformation and product acceleration across Actian. In the modern data landscape, AI is not a siloed experimental lab; it is a… * ![Cresta logo](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2022/08/4d686e40b22cf2510b627c59afe5fd95.jpg) Cresta Sep 12 ### [Senior Software Engineer, Backend (AI Agent Integrations)](https://jobicy.com/jobs/149101-senior-software-engineer-backend-ai-agent-integrations.md) Cresta unlocks the true potential of the customer experience, turning every conversation into a competitive advantage. Cresta’s unified AI platform combines conversational AI agents, real-time human agent augmentation, and comprehensive… * ![Upstart logo](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2025/06/bc2cfa2b-221-1.jpeg) Upstart Sep 12 ### [Senior Software Engineer, Unsecured Installments](https://jobicy.com/jobs/149108-senior-software-engineer-unsecured-installments.md) About Upstart At Upstart, we’re united by a mission that matters: to radically reduce the cost and complexity of borrowing for all Americans. Every day, we bring creativity, experimentation, and… * ![Liftoff logo](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2025/06/c47aea9f-221.png) Liftoff Sep 12 ### [Senior Gen AI Software Engineer](https://jobicy.com/jobs/153108-senior-gen-ai-software-engineer.md) Liftoff is a leading AI-powered performance marketing platform for the mobile app economy. Our end-to-end technology stack helps app marketers acquire and retain high-value users, while enabling publishers to maximize… * ![Webflow logo](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2022/01/b75fa7e9-221.jpg) Webflow Sep 12 ### [Senior Manager, Engineering](https://jobicy.com/jobs/153110-senior-manager-engineering.md) Webflow is the agentic web marketing platform for modern marketing teams, helping organizations build, manage, and optimize high-performing web experiences that drive predictable growth and strengthen brand trust. Building at… * ![Rithum logo](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2025/06/fe3986d8-221-1.jpeg) Rithum Sep 12 ### [Senior Software Engineer I](https://jobicy.com/jobs/153109-senior-software-engineer-i.md) Rithum Corporation (Plano, TX) seeks a Senior Software Engineer I to work remotely in the U.S. to improve on processes, quality and techniques, with the goal of producing the highest… * ![Zapier logo](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2021/03/Jobicy-210317121153-967239.png) Zapier Sep 12 ### [Staff Backend Engineer, Commerce](https://jobicy.com/jobs/153097-staff-backend-engineer-commerce.md) AI at Zapier At Zapier, we build and use automation every day to make work more efficient, creative, and human. So if you’re using AI tools while applying here –…