Ali Hajatnia

About

Software engineer with 14 years of experience across compiler and runtime engineering, low-latency backend systems, and applied machine learning. Currently Director of Engineering at XVICA in London and a third-year medical student (MBBS expected 2028). Previously worked on Go-based compiler/runtime infrastructure for order matching and market data platforms, and senior backend engineering on UK payments, Open Banking (PSD2), and Pay.UK interbank payment integrations. Current focus is healthcare AI, including clinical reasoning evaluation and decision support prototypes.

Experience

• Director of Engineering · XVICA02-01-2025

  • XVICA builds, operates, and invests in critical digital infrastructure for institutional clients that need certainty at scale. • Lead a team of 4 to 5 engineers with responsibility for architecture, hiring, and delivery. • Production stack covers Go, TypeScript, and Python services running on AWS, GCP, and Hetzner, with Cloudflare and Vercel for edge and frontend. • Set engineering standards across code review, CI/CD, observability, security review, and on-call rotations, in a regulated environment. • Work on healthcare AI alongside MBBS studies, focused on clinical reasoning evaluation and decision support prototypes.

• Senior Software Engineer · UK Fintech Startup04-01-2023 – 11-01-2025

  • Built and maintained backend services in Go and TypeScript covering ledger operations, payments orchestration, and end-to-end transaction tracing. • Implemented Open Banking integrations against UK PSD2-aligned APIs covering account information services and payment initiation. • Built direct integrations with Pay.UK interbank payment systems, including Faster Payments, with strong correctness requirements on financial state. • Implemented settlement reconciliation flows and contributed to platform observability practices: structured logging, metrics, distributed tracing. • Reviewed designs and mentored other engineers in an FCA-aligned regulated environment.

• Senior Software Engineer · Market Infrastructure Startup06-01-2019 – 04-01-2023

  • Built compiler and runtime infrastructure in Go for an early-stage market infrastructure startup focused on order matching and market data, with TypeScript for tooling and developer experience. • Designed a code generation backend and runtime layer that sat in the hot path of the matching engine, with strict tail latency and jitter requirements. • Implemented runtime support for high event throughput at microsecond-class p99 latency under sustained production load. • Built custom arena allocators, object pools, and worker pool tuning that reduced GC pressure and tail latency relative to the previous design. • Owned the codegen backend and runtime executor across the full lifecycle: language specification, optimisation passes, production deployment, and on-call. • Worked closely with the trading and operations team on hot-path code where correctness, determinism, and latency had to hold simultaneously.

• Software Engineer and Consultant · Independent Engineering Work2000 – 2019

  • First commercial software project shipped at age 14. Subsequent independent client work spans embedded systems, web infrastructure, and security tooling. • Specific client and system names, proprietary algorithms, and exact performance figures are omitted under NDA.

Education

• Medical SchoolMBBS, MBBS, Bachelor of Medicine and Bachelor of Surgery

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