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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Product Software Engineer - Merchant Experience - **Company:** Sequra - **Location:** Spain (Remote available) - **Contract:** Permanent contract - **Skills:** Artificial Intelligence, Software Debugging, Ruby on Rails, Software Engineering, ReactJS, Backend, Front End Software Development - **Published:** September 15, 2026 - **Apply:** https://startup.jobs/senior-product-software-engineer-merchant-experience-sequra-10064089 ## About the Role * 7+ years of experience building production software. * Strong software engineering fundamentals. * Experience owning work beyond implementation. * Comfortable working across backend and frontend when needed. * Comfortable working with ambiguity and incomplete information. * Strong product and customer curiosity. * High autonomy, ownership and accountability. * Comfortable working directly with stakeholders and other teams. * Experience using AI meaningfully in your software development workflow. * Strong written and verbal communication skills in English. Nice to have: * Experience with Ruby on Rails and/or React. * Strong full-stack experience. * Experience building platforms or capabilities used by other teams. * Experience with product discovery, experimentation or success metrics. * Spanish fluency. ## Description We're looking for a Senior Product Builder who wants to own product problems, not just engineering tasks. You'll work across the full lifecycle of B2B initiatives: understand * shape * build * ship * measure * iterate This is not a frontend or backend-specific role. Our main stack is Ruby on Rails and React, but we care more about strong engineering fundamentals, product judgment and the ability to work across the stack when needed. You won't receive a perfectly specified backlog. You'll be expected to help create the work: understand merchants and the business, challenge assumptions, work through ambiguity and decide with the team what is worth building. About the Merchant Experience team We build the B2B product experiences that help merchants manage and grow their business with seQura. The team owns merchant-facing products and the platform behind them, including order management, analytics, self-service capabilities, growth initiatives and platform features used by other B2B teams. We are a small team of senior Product Engineers and a Product Designer, with no dedicated Product Manager by design. Engineers are expected to contribute beyond implementation: understanding problems, shaping opportunities, making product and technical decisions, shipping solutions and checking their outcomes. Initiatives are led by engineers who take ownership of a problem, gather context, define the hypothesis and success criteria, shape the work, drive delivery and follow up after launch. AI-assisted development is part of our daily workflow. As implementation gets faster, we expect engineers to spend more of their judgment on what to build, why it matters and what we learn from it. What challenges you'll be solving * Own product initiatives end-to-end, from problem understanding to outcome validation. * Act as Champion for initiatives: gather context, define hypotheses and success criteria, shape the work and drive it forward. * Work directly with merchants, business stakeholders, Product Design and other engineering teams when needed. * Build and operate production software across backend and frontend. * Make pragmatic product and technical decisions with incomplete information. * Use data, feedback and experiments to decide whether to iterate, change direction or stop. * Contribute to evolving Merchant Portal into a platform other B2B teams can build on. * Use AI throughout your workflow, including exploration, implementation, testing, debugging and learning unfamiliar systems. What to expect in the next 90 days Month 1 Learn the B2B domain, Merchant Portal, codebase and current initiatives. Shadow a Champion, meet key stakeholders and start contributing. Month 2 Own a small initiative with support from the team, from understanding the problem to shipping it. Month 3 Act as Champion for an initiative: frame the problem, define the hypothesis and success criteria, ship a solution and check the outcome. ## Related Videos - [Migrating half a million users to a new payment service provider](https://www.wearedevelopers.com/videos/730-migrating-half-a-million-users-to-a-new-payment-service-provider) - [Watch Tests Go Brrrr! : Getting Started with Cypress in ReactJS](https://www.wearedevelopers.com/videos/282-watch-tests-go-brrrr-getting-started-with-cypress-in-reactjs) - [Developing the Backend with Stefan Lingler, CTO at Shpock](https://www.wearedevelopers.com/videos/100360-developing-the-backend-with-stefan-lingler-cto-at-shpock) - [Coffee with Developers: David Heinemeier Hansson](https://www.wearedevelopers.com/videos/875-coffee-with-developers-david-heinemeier-hansson) - [Syntax, Semantics, and Systems: From Linguistics to Software - Yasmine Kordjazy](https://www.wearedevelopers.com/videos/1940-syntax-semantics-and-systems-from-linguistics-to-software-yasmine-kordjazy) - [Meet Your New BFF: Backend to Frontend without the Duct Tape](https://www.wearedevelopers.com/videos/682-meet-your-new-bff-backend-to-frontend-without-the-duct-tape) ## Related Articles - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [The 12 Best Jobs for Software Engineers](https://www.wearedevelopers.com/magazine/401-the-12-best-jobs-for-software-engineers) - [Where To Find Software Engineering Jobs](https://www.wearedevelopers.com/magazine/396-where-to-find-software-engineering-jobs) - [Find a Developer Job: 12 Best Job Sites For Developers](https://www.wearedevelopers.com/magazine/165-find-a-developer-job-12-best-job-sites-for-developers) - [How Much Does a Software Engineer Make? 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