Senior Product Engineer (Backend) @ CareerOS | Speedinvest Job Board
About this role
Browse open roles below and find your next big career move. companies Jobs Senior Product Engineer (Backend) CareerOS Software Engineering, Product International Falls, MN, USA Posted on Aug 11, 2026 Apply now About Us CareerOS is a B2B2C career platform serving 100+ top MBA programs worldwide - including Oxford, INSEAD, London Business School, Georgetown, and Notre Dame - along with 30+ employers. We help 500K+ users land jobs they love, and we're growing with real revenue (not just runway). We're a small, high-output team of 5 engineers based in Barcelona, scaling to 10+. We work in small squads, each owning their area of the product end-to-end. We ship fast, own our decisions, and push each other to do great work. The Role We're looking for a Senior Product Engineer - someone who builds full features from database to UI, with strength in backend systems. You'll work directly with the CTO and CPO, not through layers of management. You'll be in the room when decisions get made and have real input on what we build and how. We call this a "Product Engineer" role because you won't just implement tickets. You'll own features end-to-end, make product calls, and ship things that matter to real users. Tech stack: Node.js (primary for new code), some legacy Go (~20%), React/TypeScript on frontend. Infrastructure on GCP with Terraform. Typical split: ~60% backend/infra, ~40% frontend - varies by project. What You'll Actually Do Ship full features, end-to-end - From schema design to API to UI. You'll own the whole vertical, not just one layer. Build and maintain infrastructure - GCP, Terraform, CI/CD pipelines. You'll keep the systems running and improve them over time. Optimize databases - Write complex queries, tune performance, design schemas that scale. Make product decisions - See a better way to solve a user problem? Propose it and build it. We trust engineers to make smart calls on technical and product decisions. Build with AI tools - We use Claude Code, Cursor, and other AI tools daily. You should be comfortable (or excited) to work this way. Own your code in production - Continuous deployment means what you merge today is live today. You'll debug, monitor, and improve what you build. What We're Looking For Must-haves: 5+ years building production systems, with strong backend experience (Node.js or Go) Solid SQL skills - complex queries, performance tuning, schema design Infrastructure experience - GCP or AWS, Terraform, CI/CD pipelines Comfortable across the stack - backend-focused but can ship real frontend features in React/TypeScript, not just "fix a button" Strong product intuition - you've shipped features where you made architectural and product calls Excellent communication - clear writing, respectful pushback, documentation others actually read Comfortable with ambiguity - you ask the right questions, make reasonable assumptions, and move forward Fluent English - we're distributed; clear communication is essential Strong signals: You've worked at an early-stage startup before (and liked it) Experience with auth systems - OAuth, SAML, SSO, Auth0 Side projects or open source that show you build things because you're curious You've used AI coding tools and have opinions about them You care about craft - clean code, good abstractions, reliable systems What This Role is NOT Let's be honest about fit: ❌ Not a chill 9-to-5 - Startup means more ownership, higher stakes, and hard pushes around launches. We respect personal time and recover after sprints, but when we ship, we ship hard. ❌ Not highly structured - If you need detailed specs and clear roadmaps to function, this isn't the place. ❌ Not backend-only - You'll spend real time in React. If you want pure backend/infra, this isn't the role. ❌ Not frontend-heavy - If you want to go deep on UI/UX, we have a Frontend Product Engineer role. Growth You'll join as one of 5 engineers, growing to 10+. As we scale, there's a clear path to tech lead or staff engineer for the right person. You'll help shape engineering culture, not just inherit it. What You Get Competitive salary + stock options - we'll discuss based on experience and location Remote-friendly - Barcelona hybrid optional, remote within CET ±2 hours Small team, visible impact - 500K+ users, real revenue, your work matters Work directly with CTO and CPO - fast decisions, no layers, real influence AI-native team - we are using Claude Code and Cursor in our day-to-day and open to trying new Don't check every box but think you'd be great? Apply anyway. We care more about trajectory and taste than credentials. Apply now See more open positions at CareerOS Speedinvest Team Portfolio Network & Portfolio Success How We Work Knowledge Connect Careers Investment Teams AI & Infra Climate Tech & Industrial Tech Deep Tech Fintech & DeFi Growth Health & Bio Marketplaces & Consumer Middle East, Africa & Beyond Our Commitments Legal Diversity, Equity & Inclusion Login LP Login Founder Login © 2025 Speedinvest. All rights reserved.
What this role is, and what else it is called
Employers in London advertise this kind of work as Software Engineer, Senior Software Engineer, Web Developer and Full Stack Developer too, so it is worth searching more than one wording. It is a senior Software Engineering role in London, advertised as hybrid, splitting time between home and the office.
About hiring at Speedinvest
Speedinvest has 3 other live technology roles on its careers page, across Software Engineering and Cybersecurity. Of those, 25% are advertised as fully remote and 50% as hybrid. See all Speedinvest roles, salaries and stack.
How this role compares to the market
713 live UK roles list TypeScript right now, from 270 employers. The median advertised salary is £80,000; 46% are advertised as remote. Browse TypeScript roles.
1,610 live UK roles list React right now, from 459 employers. The median advertised salary is £85,000; 36% are advertised as remote. Browse React roles.
London has 4,326 live IT vacancies across 1,366 employers, with a median advertised salary of £70,000. Browse London roles.
Senior roles make up 1,630 of the live UK IT market and advertise a median of £80,000.
Market figures are today's snapshot of live UK roles on employer careers pages; see hiring trends.
Technologies mentioned
Detected on Speedinvest's careers page. ProdReady Recruitment lists this vacancy as an aggregator and is not the employer; applications go to the employer's own site. More IT jobs in London.