hyperexponential

Lead Software Engineer

hyperexponential

full-time

Posted on:

Location Type: Hybrid

Location: Warsaw • Poland

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Job Level

Senior

Tech Stack

CloudKotlinPythonRustTypeScript

About the role

  • Architect and build AI-driven products from scratch, tackling complex problems with no established playbook.
  • Lead the design and implementation of novel features such as domain-specific coding copilots within hx’s proprietary development environment.
  • Partner with cross-functional peers to shape architectural decisions, ensuring scalability, reliability, and long-term sustainability of our AI systems.
  • Experiment, prototype, and ship rapidly, seeing innovations move quickly from idea to production in live customer environments.
  • Contribute to the evolution of hx’s AI technical vision, embedding best practices and advancing engineering excellence across the team.
  • Act as a multiplier: mentoring engineers, raising standards, and building a culture of curiosity, speed, and quality.

Requirements

  • Built and shipped technically complex production systems in Python (ideally, but we are also open to Rust and Kotlin, with TypeScript as strong plus), including distributed services and cloud-based infrastructure.
  • Solved messy, real-world engineering problems involving data, scale, performance, or reliability — not just greenfield CRUD apps.
  • Taken end-to-end ownership of technical initiatives: identifying opportunities, designing solutions, and delivering impact.
  • Communicated complex technical ideas clearly to a range of stakeholders, from engineers to product leaders.
  • Influenced engineering direction and culture, scaling local wins into broader practices.
  • Delivered AI or ML-powered products from prototype to scale, balancing experimentation with production rigour - nice to have.
Benefits
  • B2B
  • Share Options at a highly successful Series B company
  • 25 days of non-working + Polish bank holidays
  • £5,000 GBP budget for Learning & Development
  • Mental Health Support and Therapy via Spectrum Life
  • Optional for you: access to Private Healthcare via Luxmed + Multisport (fully funded by yourself as B2B Contractor)
  • Top-spec laptop (MacOS or Windows)
  • Contract of Employment (UoP)
  • Share Options at a highly successful Series B company
  • £5,000 GBP budget for Learning & Development
  • 26 days of holiday + Polish bank holidays
  • Company pension
  • Company Sick Pay for 10 days at 100% salary
  • Mental Health Support and Therapy via Spectrum Life
  • Monthly Wellbeing allowance via Juno
  • Private Healthcare Insurance via Luxmed
  • Multisport - Classic level
  • Top-spec work equipment (MacOS, Windows + additional monitors, mechanical keyboards etc)
Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools
PythonRustKotlinTypeScriptdistributed servicescloud-based infrastructureAI productsML productsprototypingproduction systems
Soft Skills
mentoringcommunicationinfluencingownershipproblem-solvingcollaborationcuriosityspeedqualityengineering excellence