System1 on cord

System1

Backend Software Engineer

External position
Hiring internally for System1?
Market Research · Analytics
The Ad Effectiveness Agency.
Posted
5 days ago
Checked
cord regularly checks that external positions are still open
10 hours ago

Skills & Experience

Job roles: Back End
Experience level: Senior
Core skills considered: Python, APIs, REST
Other skills considered: Cloud Computing, Machine Learning, Security and Compliance

Logistics

Base salary: Undisclosed
Some companies on cord are unable to disclose salaries publicly due to internal company policies. Message the company for salary information.
Employment type: Permanent
Remote working: Hybrid
Visa sponsorship: Not available

Job Description

We are looking for a talented and ambitious Backend Software Engineer to join the empowered product team building System1's next-generation AI platform. You will help shape how the world's largest brands predict and improve the effectiveness of their advertising, building the Python services, APIs and integrations that power the platform. You will work as a first-class member of the product team alongside your Product Manager, Product Designer and Team Lead to discover and deliver outcomes that matter to our customers and our business. This is a rare opportunity to help build a new platform from the ground up, engineer in a genuinely AI-native way, and work at the speed our market demands.


What will you be doing?

  • Partner as a member of an empowered product team (Product Manager, Product Designer, Team Lead and engineers), sharing accountability for the outcomes your team commits to.
  • Contribute to continuous product discovery, helping the team assess feasibility early and building quick technical prototypes to test ideas before we commit to building.
  • Design, build and own Python backend services for our AI platform, from media upload through asynchronous ML processing to insight delivery.
  • Work API-first and spec-driven, defining clean REST contracts that serve headless frontends, internal teams and customer integrations.
  • Build MCP servers that make System1's data and capabilities available to AI agents and tools, for customers and colleagues alike.
  • Engineer through Claude Code day to day, building and sharing skills, subagents and workflows that raise the speed and quality of the whole team.
  • Take code into production at scale with confidence, bringing the testing, observability and reliability our enterprise customers expect.
  • Contribute to our infrastructure as code and cloud environment, understanding how your services are deployed, run and scaled.
  • Work alongside our data scientists to bring models into production, learning the machine learning side of the platform as you go.
  • Build with enterprise security and compliance in mind, so the world's largest advertisers can trust the platform with their data.

You need to be this kind of person:

  • A missionary, not a mercenary. You care deeply about the customer problem and the outcome, not just the code.
  • Outcome-driven. You measure your success by the change you create for customers and the business, not by tickets closed.
  • An engineer first, with AI as a force multiplier. You use AI tools to move faster with rigour, not to skip the thinking.
  • Comfortable with ambiguity and ownership. You don't wait for a perfectly specified ticket, you frame the problem with your team and go.
  • A clear communicator, able to explain technical trade-offs to product, design, data science and commercial colleagues as well as to fellow engineers.
  • Curious and a lifelong learner, with the integrity to back your point of view with evidence in front of colleagues, customers and stakeholders.
  • Able to see the bigger picture without losing attention to detail, your code quality is as strong as your product thinking.
  • A natural collaborator, comfortable working with all departments at all seniorities, and equally able to drive work forward independently.
  • Passionate about (good!) advertising, how it works and how it can be improved or excited to become so.

You need to have the following experience:

To be successful in this role, you will have approximately 3-5 years of real-world software engineering experience and be ready to operate as a first-class member of an empowered product team, where you'll have outsized influence on the outcomes we deliver.

  • Strong commercial experience building backend services in Python.
  • Experience designing and building REST APIs, ideally spec-driven, with a clear understanding of what frontends need from a headless architecture.
  • Experience building SaaS software and taking code into production at scale, whether as part of a team or with personal responsibility for it.
  • Hands-on experience with at least one major cloud platform (e.g. AWS, Azure, GCP).
  • A working understanding of infrastructure as code and the ability to contribute to it.
  • Solid experience working with databases and data modelling.
  • Daily use of Claude Code as an engineering tool, including building your own skills and subagents, with an engineering-led approach rather than vibe coding.
  • Experience building MCP servers, or a strong understanding of MCP and a drive to build with it.
  • Experience working in a product operating model, as part of an empowered, cross-functional product team.
  • Familiarity with the security and compliance requirements of enterprise customers.
  • Familiarity with machine learning systems, or a genuine desire to learn, is a plus.
Backend Software Engineer at System1
Position posted 5 days ago

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Starling Bank on cord

Starling Bank

Full Stack Engineer (ML Ops)

London, UK
FinTech · Banking · Finance
A better bank for everyone
Active
over 6 months ago
Responds to
0% of requests
Responds in
1h 55m
Requests
7 pending

Skills & Experience

Job roles: Full Stack
Experience level: Mid, Senior
Core skills considered: Java, React, Redux, AWS, JavaScript

Logistics

Base salary: £70K - £110K
Employment type: Permanent
Remote working: Hybrid (up to 2 remote days p/w)
Visa sponsorship: Not available

Job Description

Starling is the UK’s first and leading digital bank on a mission to fix banking! Our vision is fast technology, fair service, and honest values. All at the tap of a phone, all the time.

Starling is the UK’s first and leading digital bank on a mission to fix banking! We built a new kind of bank because we knew technology had the power to help people save, spend and manage their money in a new and transformative way.

We’re a fully licensed UK bank with the culture and spirit of a fast-moving, disruptive tech company. We’re a bank, but better: fairer, easier to use and designed to demystify money for everyone. We employ more than 3,000 people across our London, Southampton, Cardiff and Manchester offices.

Our technologists are at the very heart of Starling and enjoy working in a fast-paced environment that is all about building things, creating new stuff, and disruptive technology that keeps us on the cutting edge of fintech. We operate a flat structure to empower you to make decisions regardless of what your primary responsibilities may be, innovation and collaboration will be at the core of everything you do. Help is never far away in our open culture, you will find support in your team and from across the business, we are in this together!

The way to thrive and shine within Starling is to be a self-driven individual and be able to take full ownership of everything around you: From building things, designing, discovering, to sharing knowledge with your colleagues and making sure all processes are efficient and productive to deliver the best possible results for our customers. Our purpose is underpinned by five Starling values: Listen, Keep It Simple, Do The Right Thing, Own It, and Aim For Greatness.

Hybrid Working

We have a Hybrid approach to working here at Starling - our preference is that you're located within a commutable distance of one of our offices so that we're able to interact and collaborate in person. We don't like to mandate how much you visit the office and work from home, that's to be agreed upon between you and your manager.

Our Data Environment

Our Data teams are excited about the value of data within the business, powers our product decisions to improve things for our customers and enhance effective and agile decision making, regardless of what their primary tech stack may be. Hear from the team in our latest blogs or our case studies with Women in Tech.

We are looking for talented data professionals at all levels to join the team. We value people being engaged and caring about customers, caring about the code they write and the contribution they make to Starling. People with a broad ability to apply themselves to a multitude of problems and challenges, who can work across teams do great things here at Starling, to continue changing banking for good.

Requirements

We have built our entire banking platform in house and mostly in Java. We are looking for people who want to work on building the tooling that is used by our engineers on a daily basis.

We are looking for people who are truly full stack, and are as comfortable polishing their javascript front end as they are debugging the innards of their java applications database interactions, or standing up infrastructure with terraform. We are looking for people who can:

  • Design REST apis.
  • Code backend services, ideally using Java, or another other server side compiled language.
  • Develop modern front ends, ideally using React and Redux.
  • Get their code into the cloud and support it there, ideally on AWS.
  • Believe in clean coding, simple solutions, automated testing and continuous deployment.
  • Like to take ownership of a feature from the original idea through to live.
  • Think (like us) that a small number of empowered developers is the right way to deliver software.

Company Benefits

  • 33 days holiday (including flexible bank holidays)
  • An extra day’s holiday for your birthday
  • 16 hours paid volunteering time a year
  • Part-time and/or flexible hours available for most roles
  • Salary sacrifice, company enhanced pension scheme
  • Life insurance at 4x your salary
  • Hybrid/remote working
  • Private Medical Insurance with VitalityHealth including mental health support and cancer care. Partner benefits include discounts with Waitrose, Mr&Mrs Smith and Peloton
  • Generous family-friendly policies
  • Varied social groups set up and run by our employees
  • Perkbox membership giving access to retail discounts, a wellness platform for physical and mental health, and weekly free and boosted perks
  • Access to initiatives like Cycle to Work, Salary Sacrificed Gym partnerships and Electric Vehicle (EV) leasing

Full details are available on our careers site

Interview Process

Interviewing is a two way process and we want you to have the time and opportunity to get to know us, as much as we are getting to know you! Our interviews are conversational and we want to get the best from you, so come with questions and be curious. In general you can expect the below, following a chat with one of our Talent Team:

  • Stage 1 - 30 mins with one of the team
  • Stage 2 - Take home challenge
  • Stage 3 - 90 mins technical interview with two team members
  • Stage 3 - 45 min final with an executive and a member of the people team
Alex Yeates on cord
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