Software Engineer – SDK

2 weeks ago

London, Greater London, United Kingdom Symbolica AI Full time £60,000 - £120,000 per year

About Us
Symbolica is an AI research lab pioneering the application of category theory to enable logical reasoning in machines.

We're a well-resourced, nimble team of experts on a mission to bridge the gap between theoretical mathematics and cutting-edge technologies, creating symbolic reasoning models that think like humans – precise, logical, and interpretable. While others focus on scaling data-hungry neural networks, we're building AI that understands the structures of thought, not just patterns in data.

Our approach combines rigorous research with fast-paced, results-driven execution. We're reimagining the very foundations of intelligence while simultaneously developing product-focused machine learning models in a tight feedback loop, where research fuels application.

Founded in 2022, we've raised over $30M from leading Silicon Valley investors, including Khosla Ventures, General Catalyst, Abstract Ventures, and Day One Ventures, to push the boundaries of applying formal mathematics and logic to machine learning.

Our vision is to create AI systems that transform industries, empowering machines to solve humanity's most complex challenges with precision and insight. Join us to redefine the future of AI by turning groundbreaking ideas into reality.

About the role
We're looking for a Python Software Engineer to take full ownership of building and shipping the core systems that power Symbolica's applied AI products. This is a true generalist role: you'll work across our SDK, developer libraries, server-side platform, integrations with inference providers, and applied AI features such as agent engineering, per-model optimizations, and context tuning.
 
Your work will directly shape the developer and user experience — from designing clean APIs and libraries that customers use every day, to building the backend systems and integrations that make it all reliable at scale. You'll be the bridge between research prototypes and production-quality systems, helping turn cutting-edge ideas into tools that developers love.
 
This is an onsite role based in our London office (66 City Rd).
 
Your focus
  • Build, maintain, and improve Python-based systems across the stack: SDK, libraries, APIs, server-side platform, and integration layers.
  • Work on applied AI engineering, including per-model optimisations, context tuning, and agent-related features.
  • Design developer-facing tools and libraries that customers can use directly.
  • Integrate with external inference providers to ensure reliability and scalability.
  • Own projects end-to-end: clarify requirements, design, implement, test, and ship production-ready code.
  • Collaborate with ML researchers and engineers to turn prototypes into robust, usable systems.
  • Contribute to architecture discussions, code reviews, and best practices for building maintainable software.
  • Continuously improve developer experience and system performance.
About you
  • 4+ years of professional software engineering experience, with Python as your primary language.
  • Strong track record of delivering production-quality systems end-to-end.
  • Proven ability to work from incomplete specs and drive projects to completion.
  • High standards for code quality, testing, maintainability, and performance.
  • Experience with ML infrastructure, applied AI systems, or developer tooling is a big plus.
  • Thrive in fast-moving, ambiguous environments where priorities shift quickly.
  • Ownership mindset: you see what needs doing and take responsibility for delivery.

What we offer

  • Competitive salary and early-stage equity package
  • A high-trust, execution-first culture with minimal bureaucracy
  • Direct ownership of meaningful projects with real business impact
  • A rare opportunity to sit at the interface between deep research and real-world productisation

We are able to sponsor a Skilled Worker visa for qualified candidates applying to this position. This specific role exceeds the minimum salary threshold set by the UK government for Skilled Worker visa sponsorship. Please note that English language proficiency at B2 level or higher is required for this role.

Symbolica is an equal opportunities employer. We celebrate diversity and are committed to creating an inclusive environment for all employees, regardless of race, gender, age, religion, disability, or sexual orientation.

  • Senior Android Engineer

    2 weeks ago

    London, Greater London, United Kingdom Dojo Full time £60,000 - £120,000 per year

    The roleOur mission is to decouple payments from hardware by building a world-class software payment engine that allows any partner or Dojo app to accept payments, on any device, anywhere. This is the core purpose of our Payment Engine team at Dojo. The technology you will build is fundamental to the future of our in-person payments ecosystem, enabling...

  • Senior Software Engineer

    1 week ago

    London, Greater London, United Kingdom Postman Full time £80,000 - £140,000 per year

    Who Are We?Postman is the world's leading API platform, used by more than 40 million developers and 500,000 organizations, including 98% of the Fortune 500. Postman is helping developers and professionals across the globe build the API-first world by simplifying each step of the API lifecycle and streamlining collaboration—enabling users to create better...

  • Senior Software Engineer

    1 week ago

    London, Greater London, United Kingdom Kraken Full time £600,000 - £1,200,000 per year

    Building the Future of Crypto Our Krakenites are a world-class team with crypto conviction, united by our desire to discover and unlock the potential of crypto and blockchain technology.What makes us different? Kraken is a mission-focused company rooted in crypto values. As a Krakenite, you'll join us on our mission to accelerate the global adoption of...

  • Senior Software Engineer

    2 weeks ago

    London, Greater London, United Kingdom Kraken Full time £80,000 - £120,000 per year

    Building the Future of CryptoOur Krakenites are a world-class team with crypto conviction, united by our desire to discover and unlock the potential of crypto and blockchain technology.What makes us different?Kraken is a mission-focused company rooted in crypto values. As a Krakenite, you'll join us on our mission to accelerate the global adoption of crypto,...

  • Software Engineer

    3 days ago

    London, Greater London, United Kingdom GamblingCareers Full time

    Aristocrat is seeking a dedicated and ambitious Software Engineer specializing in React Native to join our dynamic team. Our mission to bring happiness to life through the power of play is at the heart of everything we do. As part of our forward-thinking and people-first culture, you'll have the chance to create a significant impact by developing flawless...

  • Senior Software Engineer

    1 week ago

    London, Greater London, United Kingdom Kraken Full time £80,000 - £120,000 per year

    Building the Future of Crypto Our Krakenites are a world-class team with crypto conviction, united by our desire to discover and unlock the potential of crypto and blockchain technology.What makes us different? Kraken is a mission-focused company rooted in crypto values. As a Krakenite, you'll join us on our mission to accelerate the global adoption of...

  • Software Engineer

    6 days ago

    London, Greater London, United Kingdom Spotify Full time €60,000 - €120,000 per year

    We are looking for dedicated, engaged software engineers that are passionate about working on highly available, low latency client SDKs and the related backend services in the authorization and configuration domains to join our teams. These form the backbone of our product experience for hundreds of millions of users worldwide. You'll be directly helping...

  • Staff Software Engineer, Device Integrations

    2 days ago

    London, Greater London, United Kingdom Automata Full time

    Staff Software Engineer – Robotics & Life Sciences AutomationLocation:London, UK - Hybrid (3 days/week on site)Contract:4 months with possibility of extensionStart:ASAP (Dec 2025 / Jan 2026)Automata: accelerating breakthroughs that save livesAutomata builds automation that accelerates life sciences: enabling faster drug discovery, next-generation...

  • Staff Software Engineer, Device Integrations

    1 week ago

    London, Greater London, United Kingdom Automata Full time £80,000 - £150,000 per year

    Staff Software Engineer – Robotics & Life Sciences AutomationLocation: London, UK - Hybrid (3 days/week on site)Contract: 4 months with possibility of extensionStart: ASAP (Dec 2025 / Jan 2026)Automata: accelerating breakthroughs that save livesAutomata builds automation that accelerates life sciences: enabling faster drug discovery, next-generation...

  • Software Engineer

    2 weeks ago

    London, Greater London, United Kingdom stackspell labs, Inc. Full time

    The Companystackspell labs, Inc. is a venture-backed startup (strategically in stealth) building the AI-native abstraction layer for enterprise software.We're reimagining how complex enterprise software systems/platforms (e.g., SAP, Salesforce, Workday, Dynamics, etc.) are extended, integrated, configured, and operated by AI agents.Think Lovable meets...