Python Software Engineer

Faculty

WHY FACULTY? We established Faculty in 2014 because we thought that AI would be the most important technology of our time. Since then, we’ve worked with over 350 global customers to transform their performance through human-centric AI. You can read about our real-world impact here. We don’t chase hype cycles. We innovate, build and deploy responsible AI which moves the needle - and we know a thing or two about doing it well. We bring an unparalleled depth of technical, product and delivery expertise to our clients who span government, finance, retail, energy, life sciences and defence. Our business, and reputation, is growing fast and we’re always on the lookout for individuals who share our intellectual curiosity and desire to build a positive legacy through technology. AI is an epoch-defining technology, join a company where you’ll be empowered to envision its most powerful applications, and to make them happen. ABOUT THE TEAM In our Professional and Financial Services Business unit, we bring everything we have learned in more than a decade of Applied AI, and use it to help our clients navigate a rapidly changing landscape. We develop and embed AI solutions which help financial institutions become more efficient, enhance customer experience, and find the commercial upside in uncertain markets. Within the constraints of a highly regulated industry, we see so much opportunity for impactful innovation and are proud to set the gold-standard for marrying technical excellence with safe deployment. #LI-PRIO ABOUT THE ROLE As a Lead Software Engineer, you'll spearhead the technical direction and delivery of complex, innovative AI projects. You will act as a technical expert, applying your skills across various projects from AI strategy to client-side deployments, while ensuring architectural decisions are sound and reliable. This role demands a balance of deep technical expertise and strong leadership, focusing on driving innovation, fostering team growth, and building reusable solutions across the organisation. If you're ready to manage high-risk projects and deliver practical, innovative outcomes, this is your chance to shape our future. WHAT YOU'LL BE DOING * Acting as the primary technical authority for enterprise clients, guiding projects from discovery to production deployment. * Leading and mentoring a squad of engineers, empowering them to deliver their best work. * Implementing scalable and future-proof front and backend engineering patterns and practices. * Translating complex customer needs and implementation challenges into actionable feedback to shape the next phase of a project. * Distilling complex technical concepts for diverse audiences, from client-side engineers to senior business stakeholders.   WHO WE'RE LOOKING FOR * You have proven ability to distill complex technical concepts for a wide range of audiences. * You bring strong, hands-on experience in full-stack development, with a deep understanding of system architecture and design. * You are an expert in Python and TypeScript/React. * You possess solid knowledge of CI/CD pipelines (e.g., GitLab), Docker, and deploying applications on Kubernetes. * You have a demonstrated history of championing automated testing strategies to ensure robust and reliable code. * You have a genuine passion for working with customers, understanding their problems, and delivering solutions that provide immediate value. OUR INTERVIEW PROCESS 1. Talent Team Screen (30 minutes) 2. Pair Programming Interview (90 minutes) 3. System Design Interview (90 minutes) 4. Commercial & Leadership Interview (60 minutes) OUR RECRUITMENT ETHOS We aim to grow the best team - not the most similar one. We know that diversity of individuals fosters diversity of thought, and that strengthens our principle of seeking truth. And we know from experience that diverse teams deliver better work, relevant to the world in which we live. We’re united by a deep intellectual curiosity and desire to use our abilities for measurable positive impact. We strongly encourage applications from people of all backgrounds, ethnicities, genders, religions and sexual orientations. Some of our standout benefits: * Unlimited Annual Leave Policy * Private healthcare and dental * Enhanced parental leave * Family-Friendly Flexibility & Flexible working * Sanctus Coaching * Hybrid Working If you don’t feel you meet all the requirements, but are excited by the role and know you bring some key strengths, please don't hesitate in applying as you might be right for this role, or other roles. We are open to conversations about part-time hours.

Unlikely AI

ABOUT US At UnlikelyAI, we are building the future of AI: one that is reliable, accurate, and transparent. Our neurosymbolic technology harnesses the power of LLMs and generative AI, and combines it with Universal Language – our proprietary symbolic technology that bridges the gap between probabilistic machine learning and deterministic classical computing. Our products are already in use with major enterprises – including tier-1 banks and leading accountancy firms – across audit, compliance, and financial services. In compliance, we combine symbolic decision trees with LLM-powered evidence extraction to catch errors in financial reporting that human reviewers miss. In financial services, we use neurosymbolic guardrails to deliver accurate and explainable outcomes at scale. We are now building toward a platform – a public API and platform experience that will make our core neurosymbolic capabilities available to a broader set of customers and use cases. This is a pivotal moment: we're transitioning from bespoke customer engagements into a scalable product platform, and we need exceptional engineers to help us get there. THE ROLE To meet the demands of our growing commercial momentum, we are looking for a smart, dedicated senior software engineer to join our team. We want someone who thrives on diving deep into code to solve challenging and novel problems. You will have extensive software engineering experience, with exceptional coding ability, ideally including experience in high-growth start-ups. This role will play a major part in developing our core capabilities, which span symbolic reasoning (decision trees, propositional graphs, knowledge graphs), document ingestion pipelines, and the APIs that expose these to customers. You'll work on genuinely novel problems at the intersection of classical symbolic AI and modern LLMs – for example, how to represent regulatory knowledge as machine-evaluable rules, or how to build feedback loops that improve system accuracy over time. You'll work within a shared monorepo alongside software engineers, research engineers, and applied scientists in a heavily cross-functional environment. We operate in small, focused product teams, supported by shared infrastructure, internal tooling, and an R&D function. WHAT YOU MIGHT WORK ON In your first months, you could find yourself working on any of the following: * Building the infrastructure for our new public API, including authentication, scalability, and developer documentation. * Improving our document ingestion pipelines to handle new input formats (e.g. PDF, Word) and new regulatory jurisdictions. * Developing evaluation frameworks and benchmarks to measure and improve system accuracy. * Scaling our deployment approach for enterprise customers with specific cloud and security requirements. * Improving internal tooling and developer experience across the monorepo. * Working on the symbolic reasoning engine that powers our products – including decision tree evaluation, rule generation, and knowledge graph construction. YOU'LL BE SUCCESSFUL HERE IF... * ...you have strong proficiency in Python, including writing well-typed, well-tested code in a collaborative codebase. * ...you've tackled complex algorithms and data structures and have experience working with non-trivial algorithmic problems. * ...you care deeply about production-quality engineering – you have a track record of advocating for software quality, improving engineering standards, and championing best practices. * ...you thrive with end-to-end ownership – you've led the process from ideation to production for brand-new software systems. * ...you have experience with cloud infrastructure (AWS preferred) – services such as S3, ECR, ECS/EKS, and infrastructure managed via Terraform or similar. * ...you have a bias for action – you move quickly, make informed decisions, and iterate without waiting for perfect information. * ...you have a relevant degree in Computer Science, Mathematics, Engineering, or STEM – or equivalent practical experience. OTHER SKILLS You don't need to tick every box below, but any of the following would strengthen your application: * Monorepo experience – comfortable working in a large, shared codebase with multiple product teams contributing. * CI/CD pipelines – hands-on experience with GitHub Actions or similar. * Experience with document processing pipelines – PDF parsing, OCR, structured data extraction. * Familiarity with knowledge representation – decision trees, knowledge graphs, ontologies, or symbolic reasoning systems. * Experience with LLM integration in production systems – prompt engineering, evaluation, working with APIs such as Gemini, Claude, or OpenAI. * Frontend experience with React and TypeScript – we value engineers who can contribute across the stack when needed. * Experience in regulated industries – fintech, audit, compliance, insurance, or banking. * Familiarity with the modern Python tooling ecosystem: uv for package management, ruff for linting, pyright or similar type checkers. * Experience with observability and monitoring tools such as Datadog. HOW WE WORK We're a team of around 30 people based primarily in the UK. We operate a hybrid working policy, with three days a week in our Central London office. Engineering is organised into product-focused squads, supported by shared infrastructure and an R&D function. We work in a monorepo, deploy to AWS, and care deeply about developer experience – we're actively investing in modernising our tooling, CI, and repository structure. We run hackathons, we have strong opinions about code quality (held loosely), and we ship often. Our culture is collaborative and low-ego: engineers regularly move between teams, pair on hard problems, and contribute ideas regardless of seniority. We take the work seriously, but not ourselves. INCLUSION AND EQUAL OPPORTUNITIES We are committed to having a truly diverse team where everyone is encouraged to be their authentic selves. We are an equal opportunity employer and do not discriminate based on gender, race, religion, sexual orientation, national origin, political affiliation, disability, age, marital status, medical history, parental status or genetic information. We are committed to fostering an inclusive environment where everyone feels respected, supported, and able to thrive. If there is anything we can do to make the recruitment process more accessible or comfortable for you, please let us know.

Unlikely AI

STAFF SOFTWARE ENGINEER At UnlikelyAI, we are building the future of AI: one that is reliable, accurate, and transparent. Our neurosymbolic technology harnesses the power of LLMs and generative AI, and combines it with Universal Language – our proprietary symbolic technology that bridges the gap between probabilistic machine learning and deterministic classical computing. Our products are already in use with major enterprises – including tier-1 banks and leading accountancy firms – across audit, compliance, and financial services. In compliance, we combine symbolic decision trees with LLM-powered evidence extraction to catch errors in financial reporting that human reviewers miss. In financial services, we use neurosymbolic guardrails to deliver accurate and explainable outcomes at scale. We are now building toward a platform – a public API and platform experience that will make our core neurosymbolic capabilities available to a broader set of customers and use cases. This is a pivotal moment: we're transitioning from bespoke customer engagements into a scalable product platform, and we need exceptional engineers to help us get there. THE ROLE We are looking for a Staff Software Engineer to help shape the technical direction of our platform as we scale. This is a role for someone who combines deep hands-on engineering ability with the judgement and influence to drive architecture and engineering quality across teams. You'll be one of our most experienced individual contributors – someone the team looks to for guidance on hard technical decisions, system design, and long-term technical strategy. You'll spend most of your time writing code and solving complex problems, but you'll also be expected to identify the highest-leverage work across squads, mentor other engineers, and raise the bar for how we build software. Our core capabilities span symbolic reasoning (decision trees, propositional graphs, knowledge graphs), document ingestion pipelines, and the APIs that expose these to customers. You'll work on genuinely novel problems at the intersection of classical symbolic AI and modern LLMs – for example, how to represent regulatory knowledge as machine-evaluable rules, or how to build feedback loops that improve system accuracy over time. You'll work within a shared monorepo alongside software engineers, research engineers, and applied scientists in a heavily cross-functional environment. We operate in small, focused product teams, supported by shared infrastructure, internal tooling, and an R&D function. WHAT YOU MIGHT WORK ON In your first months, you could find yourself working on any of the following: * Defining the architecture for our new public API – making foundational decisions about authentication, scalability, versioning, and developer experience that will shape the platform for years. * Leading the design and implementation of our document ingestion pipelines to handle new input formats (e.g. PDF, Word) and new regulatory jurisdictions at scale. * Designing evaluation frameworks and benchmarks to measure and improve system accuracy – and establishing these as engineering norms across teams. * Driving improvements to our deployment architecture for enterprise customers with specific cloud and security requirements. * Owning the technical strategy for internal tooling and developer experience across the monorepo – identifying bottlenecks and leading initiatives to address them. * Working on the symbolic reasoning engine that powers our products – including decision tree evaluation, rule generation, and knowledge graph construction. * Identifying and leading cross-cutting technical initiatives that improve reliability, performance, or engineering velocity across the organisation. YOU'LL BE SUCCESSFUL HERE IF... * ...you have deep expertise in Python, including writing well-typed, well-tested code in a collaborative codebase, and strong opinions on how to structure Python projects at scale. * ...you have a proven track record in system design and architecture – you've made foundational technical decisions that shaped the trajectory of a product or platform. * ...you've tackled complex algorithms and data structures and have experience working with non-trivial algorithmic problems at scale. * ...you care deeply about production-quality engineering – you don't just advocate for software quality, you actively set the standards and build the culture around it. * ...you have a track record of technical leadership – you've influenced technical direction across multiple teams or projects without necessarily having direct reports. * ...you have significant experience with cloud infrastructure (AWS preferred) – services such as S3, ECR, ECS/EKS, and infrastructure managed via Terraform or similar – and can make informed architectural decisions about deployment and scalability. * ...you have a bias for action – you move quickly, make informed decisions, and iterate without waiting for perfect information. * ...you have a relevant degree in Computer Science, Mathematics, Engineering, or STEM – or equivalent practical experience. OTHER SKILLS You don't need to tick every box below, but any of the following would strengthen your application: * Monorepo experience – comfortable working in and improving a large, shared codebase with multiple product teams contributing. * CI/CD pipelines – hands-on experience with GitHub Actions or similar, ideally including designing and optimising CI infrastructure. * Experience with document processing pipelines – PDF parsing, OCR, structured data extraction. * Familiarity with knowledge representation – decision trees, knowledge graphs, ontologies, or symbolic reasoning systems. * Experience with LLM integration in production systems – prompt engineering, evaluation, working with APIs such as Gemini, Claude, or OpenAI. * Frontend experience with React and TypeScript – we value engineers who can contribute across the stack when needed. * Experience in regulated industries – fintech, audit, compliance, insurance, or banking. * Familiarity with the modern Python tooling ecosystem: uv for package management, ruff for linting, pyright or similar type checkers. * Experience with observability and monitoring tools such as Datadog. * Experience mentoring engineers and helping teams grow their technical capabilities. HOW WE WORK We're a team of around 30 people based primarily in the UK. We operate a hybrid working policy, with three days a week in our Central London office. Engineering is organised into product-focused squads, supported by shared infrastructure and an R&D function. We work in a monorepo, deploy to AWS, and care deeply about developer experience – we're actively investing in modernising our tooling, CI, and repository structure. We run hackathons, we have strong opinions about code quality (held loosely), and we ship often. Our culture is collaborative and low-ego: engineers regularly move between teams, pair on hard problems, and contribute ideas regardless of seniority. We take the work seriously, but not ourselves.