At a Glance
- Tasks: Architect and build a professional resale platform using AI and modern tech.
- Company: Fast-growing startup revolutionising the second-hand clothing market.
- Benefits: Competitive salary, private healthcare, 25 days holiday, and pension.
- Other info: Collaborative environment with opportunities for mentorship and growth.
- Why this job: Join a small team making a real impact in the resale industry.
- Qualifications: Strong software development experience and a passion for product impact.
The predicted salary is between 100000 - 130000 £ per year.
Resale is growing rapidly, with the global second-hand clothing market expected to grow from around £288bn today to nearly £400bn by 2030. Yet the work of listing, managing, and selling individual items is still manual, expensive, and inefficient. Listing Monster is building the professional resale platform for people who buy and sell goods at scale — from full-time resellers to charities and ambitious side businesses. We’re a small, experienced team building practical software that solves real commercial problems using AI. We care about thoughtful engineering, clean solutions, and real progress — not hype. We’re growing and looking for a Senior Product Engineer to help us scale both our platform and the way we deliver functionality to customers. This is a hands‑on engineering role for someone who has built and shipped production software at meaningful scale before, and knows what good looks like.
Who This Role Is For
This role is ideal for someone who has already spent several years building real products used by real customers. You are someone who has:
- A strong academic background in Computer Science, maths or a related discipline
- Has worked on and scaled production systems with meaningful usage
- Has helped teams ship faster and understands that done doesn’t end with the releasing of code
- Thinks deeply about product impact, not just technical implementation
- Enjoys improving systems, processes, and engineering culture
- Can take ownership of ambiguous problems and move them forward
- Has experience in architecting distributed systems
- Strong understanding of databases
What You’ll Actually Be Doing
- Helping us architect the overall platform
- Building and shipping important product features
- Helping scale our platform as usage grows
- Improving how quickly and reliably we get functionality to customers
- Working across the product, backend, frontend, AI, and operations parts of the system
- Identifying bottlenecks in our product and engineering processes
- Improving reliability, observability, performance, and maintainability
- Supporting and mentoring more junior developers
- Helping turn customer and business needs into well-designed technical solutions
This is not a role where you’ll just be handed tickets. We’ll expect you to understand the product, challenge assumptions, spot risks early, and help us build the right things in the right way.
What We’re Looking For
Essential
- Strong experience building and maintaining Software as a Service
- Excellent programming fundamentals
- Comfortable working with UX and Product Management
- Comfortable working across a modern web application stack
- Good judgement around architecture, trade‑offs, and technical debt
- Experience shipping customer-facing product features
- Clear communication and strong ownership
- Ability to work independently in a small team
- A pragmatic approach to engineering — thoughtful, but not over-engineered
Strong signals
- You’ve helped scale a product, platform, or engineering team before
- You’ve worked in a startup or scale-up environment
- You’ve a strong understanding of observability and shipping code
- You’ve made meaningful contributions to architecture or technical direction
- You’ve mentored junior engineers
- You care about product outcomes, not just code quality
What Success Looks Like
In this role, success means helping us move faster without becoming fragile. You’ll help us:
- Refine our product offering
- Ship useful functionality to customers more frequently
- Keep the platform reliable as usage grows
- Make better technical decisions earlier
- Reduce unnecessary complexity
- Improve engineering standards and habits
- Build systems that are easier to change over time
Salary & Location
Salary: £100k-£130k depending on experience
Location: Onsite in our London office at least 3 days per week, SE1 9PG
Benefits: Private healthcare, 25 days holiday, pension
What It’s Like to Work Here
Small team, low ego. Direct communication. Pragmatic engineering decisions. Real customers using what we build. We’re a startup, which means things evolve — but we’re not chaotic. We plan carefully and build deliberately. You’ll have a meaningful say in how the platform develops, how the engineering team works, and how we turn ideas into reliable customer-facing functionality. There’s a lot to build, and we’re looking for someone who can help us do it well.
Senior Software Engineer employer: Listing Monster AI
At Listing Monster, we pride ourselves on being an excellent employer by fostering a collaborative and innovative work culture where every team member's input is valued. Our London-based office offers a dynamic environment with opportunities for personal and professional growth, including mentorship for junior developers and the chance to shape our platform's future. With competitive benefits like private healthcare and generous holiday allowances, we are committed to supporting our employees' well-being while tackling meaningful challenges in the rapidly growing resale market.
StudySmarter Expert Advice🤫
We think this is how you could land Senior Software Engineer
✨Join Local Tech Meetups
Get out there and mingle with fellow developers by joining local tech meetups. It’s a fantastic way to meet people who might be working at Listing Monster AI or know someone who does. Plus, you can pick up some trendy tech skills and trends while you're at it!
✨Contribute to Open Source Projects
Show off your coding chops by jumping into open-source projects. Not only does this give you practical experience, but it also gets you noticed in the dev community. You'll create a killer portfolio that speaks volumes about your skills to Listing Monster AI.
✨Tap into Online Developer Communities
Don’t underestimate the power of online developer communities like GitHub, Stack Overflow, and even Reddit. Participate in discussions, share your projects, and build your visibility. We can often find opportunities through these channels that can lead to a full-time gig at companies like Listing Monster AI.
✨Explore Job Boards Specifically for Tech Roles
Keep your eyes peeled on job boards that focus on tech roles. Sites like TechCareers or Stack Overflow Jobs can often have listings for companies like Listing Monster AI that might not show up on broader job sites. Make it a habit to check these regularly, and don’t hesitate to apply directly through our website!
We think you need these skills to ace Senior Software Engineer
Some tips for your application 🫡
Show off your coding skills:When applying for a software engineering role, it's super important to showcase your coding skills. Make sure your CV includes your tech stack, any relevant programming languages you’re comfortable with, and examples of projects you've worked on. If you have a GitHub profile, link it up! We love to see code in action.
Tailor your portfolio:For a full-time role, we’d expect to see some solid examples of your work in your portfolio. Make sure to include at least two or three projects that highlight your problem-solving skills and your ability to work with different technologies. Focus on the projects that are most relevant to the position at Listing Monster AI.
Craft a killer cover letter:Your cover letter is your chance to stand out—make it personal! Explain why you want to work at Listing Monster AI and how your skills align with the role. Show us your passion for software development. We dig enthusiastic candidates who understand the value of collaboration and continuous learning!
Be clear and concise:When it comes to writing your CV and cover letter, clarity is key. Avoid jargon that could confuse us and stick to simple, direct language. Highlight your achievements with quantifiable results where possible, and keep everything easy to read. A well-organised application goes a long way!
How to prepare for a job interview at Listing Monster AI
✨Brush Up on Your Coding Skills
For a full-time software engineering role, it's crucial that we stay sharp with our coding abilities. Expect technical questions that might involve solving problems on the spot or discussing algorithms. Practise on platforms like LeetCode or HackerRank to get comfortable with the types of questions that often come up.
✨Know Your Tools and Frameworks
Make sure we’re well-acquainted with the tools and technologies listed in the job description. Familiarise ourselves with any specific frameworks or programming languages mentioned. If Listing Monster AI uses React or Node.js, for instance, be ready to discuss how we’ve used them in previous projects or coursework.
✨Showcase Your Projects
Bring along a portfolio that highlights our best work. This could be code samples, GitHub repositories, or any side projects we’ve built. Make sure we can talk through our thought process for each project, especially the challenges we faced and how we solved them—this shows our problem-solving skills in action.
✨Prepare for Behavioural Questions
While technical skills are key, full-time positions also require cultural fit. Be ready to discuss our previous experiences and how we handle teamwork, conflict, and deadlines. Brush up on the STAR method—Situation, Task, Action, Result—to clearly articulate our past experiences when discussing how we've contributed to a team.
