Dawid Skrzypczyński

Dawid Skrzypczyński

Senior Software Engineer

ABOUT

Senior Software Engineer working end‑to‑end across backend, frontend, infrastructure, and the AI layer — designing LLM features, owning the safety and quality layer around them, and shipping product.

Ambitious, hard‑working, product‑minded. I care about shipping things that hold up — code that's easy to change, models that don't quietly drift, products that earn user trust.

EXPERIENCE

Senior Software Engineer

Symmetrical.ai·Nov 2025 — Present·Full‑time

Building an AI‑native product for accountants — end‑to‑end across backend, frontend, infrastructure, and the AI layer.

  • Designed and shipped production LLM features end‑to‑end — intent classification, structured data extraction, retrieval‑augmented generation (RAG), and content drafting flows.
  • Built multi‑step agent pipelines on Mastra and the Vercel AI SDK — tool use, strict‑schema outputs, vision‑based document understanding, multi‑tenant vector retrieval.
  • Owned the safety and quality layer — retrieval grounding, confidence scoring, hard validation gates, drift detection in production.
  • Optimized the AI stack across OpenAI and Anthropic — prompt engineering, model selection, reasoning‑effort tradeoffs, schema reduction — balancing latency and cost at production scale.
  • Delivered full‑stack features on TypeScript / GraphQL services and Next.js / React dashboards over multi‑tenant PostgreSQL with fine‑grained authorization via OpenFGA.
  • Set the engineering bar — security‑focused code review, integration testing against real services, conventions for new domain modules.

Principal Frontend Engineer

Symmetrical.ai·Aug 2023 — Nov 2025·Remote

  • Scaled the frontend team — hiring, 1:1s, performance reviews, mentorship, career‑growth plans.
  • Built and owned the company's design system — component library, design tokens, documentation, cross‑team adoption.
  • Architected the Nx monorepo — shared code, dependency boundaries, CI/CD pipelines, app generators.
  • Set the engineering bar — code‑review standards, testing conventions, RFC process, technical direction.
  • Led platform‑wide initiatives — performance budgets, accessibility standards, error and observability instrumentation.

Senior Frontend Engineer

Symmetrical.ai·Jun 2021 — Aug 2023·On‑site

  • Owned key product surfaces end‑to‑end — feature design, implementation, code reviews.
  • Extended the design system — new components, patterns, accessibility improvements.
  • Led technical migrations — incremental refactors, architecture upgrades, dependency hygiene.
  • Mentored junior engineers — pair programming, onboarding, code reviews.

Frontend Engineer

Symmetrical.ai·Jan 2019 — Jun 2021·On‑site

  • Shipped product features end‑to‑end on a React + TypeScript stack.
  • Built complex UI flows integrated with GraphQL services, REST APIs, and microservices.
  • Established frontend foundations — testing patterns, code conventions, build tooling.

Front End Developer

Data Invest·Nov 2016 — Dec 2018·Toruń, Poland

  • Delivered product UIs across multiple client projects — SPA dashboards and marketing sites.
  • Worked across the stack — JavaScript, CSS, build tooling, deployment to production.

Full Stack Web Developer

Ideare·Jul 2015 — Jul 2016·Poland

  • Built full‑stack web applications end‑to‑end — frontend, backend, deployment.
  • Delivered features and fixes across multiple client engagements.

SKILLS

AI / LLM
OpenAI, Anthropic, retrieval‑augmented generation (RAG), vector retrieval, Mastra, Vercel AI SDK, prompt engineering, agent pipelines, tool use, structured outputs, vision models, drift observability, latency & cost tuning
Frontend
TypeScript, React, Next.js, design systems, Nx monorepo, GraphQL, Prisma, OpenFGA, Bun, accessibility, performance optimization, testing
Backend
TypeScript, Node.js, GraphQL, REST APIs, PostgreSQL, multi‑tenant architecture, fine‑grained authorization
Practice
code review, integration testing, CI/CD, technical leadership, team management, mentorship, hiring, RFC process

EDUCATION

Nicolaus Copernicus University, Toruń

M.Sc. in Computer Science·2015 — 2016

B.Eng. in Computer Science·2011 — 2015