Job OverviewResale 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 ForThis 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 ForEssential
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 LikeIn 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 & LocationSalary: £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 HereSmall 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.
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