Marek Stasikowski

Building AI-powered developer tooling and MCP-based automation systems, with emphasis on practical, measurable productivity gains rather than speculative demos.

• comms-mcp: A unified communications assistant connecting email, iMessages, and WhatsApp via Model Context Protocol. Processes 280 emails/week with AI summaries, reducing triage time by 70%. Used to resolve a small claims dispute: instant message retrieval, evidence organisation, and automated court correspondence recovered £1,080.
• hybrid-memory: A semantic memory system combining pgvector embeddings with BM25 full-text search via Reciprocal Rank Fusion, enabling long-running agentic sessions to share insights across projects.
• tcg-casting: a streaming-overlay system for Magic: The Gathering tournament broadcasts. Built the game-creation flow in Next.js + React + CSS modules, pairing polished form interactions with a broader computer-vision pipeline that identifies individual cards and their bounds in the video feed. The result lets commentators highlight cards live during broadcast.

Staff engineer at an omnichannel retail platform built on distributed systems and microservices architecture, focusing on system resilience, performance optimisation, and developer productivity.

• Unblocked $6M ARR product add-ons feature by pragmatically isolating one component from a stalled "big rewrite", using characterisation tests to safely lift it to production - cutting delivery time from months to 2 weeks.
• Designed circuit breaker patterns for both synchronous (HTTP) and asynchronous (message queue) flows to improve incident response, preventing outages caused by third-party systems that each cost up to 5 hours of on-call time plus week-long follow-ups.
• Led BFCM load testing and optimisation: tuned Kubernetes HPA, scaled AWS databases, optimised SQL queries - achieving target of 44 orders/second (over 2x previous year's average).
• Prototyped NewStore MCP - connectors to GitLab, AWS, OpenSearch, Prometheus, RabbitMQ, and Kubernetes - reducing incident investigation from up to a day to 20 minutes by unifying data scattered across microservices, Slack, Confluence, and observability tools.
• Presented technical proposals at weekly knowledge sharing sessions on legacy codebase strategies, automated testing approaches, and Monte Carlo-based delivery forecasting.

via 101 Ways

Platform engineer for an 800-engineer monorepo, focused on CI performance and onboarding efficiency.

• Championed Blacksmith migration to halve 30+ minute merge queues and reduce CI costs 4x - design approved, taken over by security review and procurement.
• Quantified onboarding friction: 30 days to get "hello world" to production. First automation iteration estimated to save 5 days per new project.
• Coached teams in mutation testing using Stryker to expose gaps and overlaps in test coverage, providing this as a new platform capability.

Joined as consultant to streamline a 100k+ SLOC React/Redux onboarding application; permanently hired as Principal Engineer after one year.

• Inherited a 100k+ SLOC onboarding app with brittle test coverage; introduced TDD, BDD (Cypress, Cucumber), and CI/CD practices that enabled the team to ship Options trading extensions and meet every FCA regulatory deadline.
• Led migration from legacy Java monolith to serverless AWS using facade pattern, gradually replacing legacy flows with Lambda functions and Step Functions.
• Designed system integration with SingPass and KYC providers (Signicat), unblocking expansion into the Singapore market.
• Implemented Options trading extensions in the user account section, contributing to multi-million ARR feature rollout within 3 months.
• Mentored team members across frontend and backend, unblocking delivery bottlenecks and reducing cross-team dependencies.

Built customer-facing platform configuration and admin tooling; promoted to Team Lead December 2021.

• Established XP feedback loops (fast tests, pair programming, daily deploys, fortnightly stakeholder reviews) that drove cycle time variability from 50% down to near zero.
• Made delivery predictable enough that tickets were consistently completed in 2 days.
• Replaced finger-in-air estimates with Monte Carlo projections based on historical data, removing time pressure from engineers.
• Reduced time spent on ceremonies: standups under 10 minutes using ActionableAgile aging WIP view, focusing only on outliers and current technical decisions.
• Coached team in TDD and organised practice sessions across London engineering community, building a culture of quality that outlasted the engagement.

via Equal Experts

First engineer on re-platforming effort to end £500k/year agency dependency.

• Designed and gained stakeholder approval for headless CMS architecture (Contentful + Commercetools) with hybrid static/SSR on GCP Cloud Run.
• Laid technical foundation (component library, Storybook, UX/design protocol) enabling the team to scale from one engineer to a full delivery squad.

Engineer for an espionage museum's interactive experiences and visitor profile system in New York.

• Built real-time visitor profile features processing data from physical devices (RFID wristbands, iPads) via AWS Kinesis, enhancing the post-visit digital experience.
• Extended interactive games and online profiles, increasing visitor engagement with takeaway content and personal data exploration.

via Equal Experts

• Built foundation for customer support app targeting reduction of £800k/year live agent costs; mentored JL Partners in frontend development.
• Cleared CSS theming tech debt to enable rebranding in My Account. Later built Auth0 integration replacing legacy system.

via Equal Experts

Took ownership of orphaned Authentication & Personalisation services with no handover documentation - reverse-engineered the codebase and established stable on-call support.

Rebuilt legacy Rails energy switching journey using React/Node with Strangler Fig pattern.

• Improved conversion rate from 2-3% to nearly 4% through modernised UX and A/B tested incremental migration.
• Redirected traffic step-by-step to new stack, eventually reducing Rails app to pure data service.

R&D role pioneering server-side React rendering for checkout pages.

• Established universal React approach that became industry standard; set technical strategy for the business.
• Shared learnings at meetups (NOTHS, Pivotal, University of London) and ReactJS Day Verona.