moOmarov/INDEX
MARK OMAROV · TOKYOSenior Product Engineer · Cogent LabsOpen to Senior IC / Tech Lead

Senior Product Engineer.End to end

Senior product engineer with 10 years shipping web products end to end. Currently shipping production AI features at Cogent Labs in Tokyo. Strong track record of greenfield delivery, platform refactors, and zero-downtime migrations.

AI Approach

LLMs as engineering components, not magic. Spec, integrate, monitor, iterate.

Tokyo8 yrs
Shipping10 yrs
CurrentCogent Labs
Open toSenior IC / TL
--:--:-- JSTTokyo onsite/hybrid or global remoteReply < 24h
Get in touchResume ↗
STACK_TypeScript · React · Next.js · Node.js · NestJS · PostgreSQL · AWS · Kubernetes · IaC · Python · Go
02 / Experience

A decade of shipping.

Mar 2025 – Present
Tokyo

Senior Product Engineer, Cogent Labs

End-to-end across new AI product lines, platform refactors, design system, and DX. Cross-functional with ML, product, design, and CTO.

  • Lead
    New AI product line
    Natural language instructions executed across user documents. Authored RFC, partnered with CTO and designer on UX, integrated with ML team models. Own UI, backend, and demo.
  • Built
    Document enhancement and serialization service
    NestJS, Kafka, S3, Postgres. Prepares documents for ML consumption, powers RAG and search pipelines.
  • Shipped
    Omakase Box, zero to production
    Greenfield product line: ordering flow, magic-link auth, sudo panel, IAM, JP localization, HubSpot. Mentored a junior engineer through delivery.
  • Solo
    SmartRead / SmartRead Classic backend split
    Reduced regression risk, narrowed QA scope per change, unblocked focused iteration. Highlighted internally as a major win.
  • Built
    Internal feature flag UI
    Layered UI on top of an existing API-only system. Gave product direct ownership over rollouts without engineering in the loop.
Jul 2022 – Mar 2025
Tokyo

Technical Lead, Asurion

Tech Lead on a remote device farm: powered an internal call center, served external clients, and provided a real-device test surface for other internal teams.

  • Migrated
    RethinkDB to PostgreSQL, zero downtime
    Multi-stage dual read-write strategy. Gradually rolled traffic to Postgres, sunsetted RethinkDB once parity confirmed.
  • Decoupled
    Tightly-integrated services
    Independently-deployable components. Reduced blast radius on a system where downtime directly impacts call center operations.
  • Cut
    CI/CD build times, several times over
    Streamed on-prem app logs to OpenSearch via Fluentd. Engineers query across services in one place instead of SSH-and-grep.
  • Mentored
    2 engineers, owned technical direction
    Roadmap planning, architectural reviews, hiring input. Contributed to early company-wide IaC standards across 3-5 teams.
Nov 2021 – Jul 2022
Tokyo

Senior Software Engineer, Asurion

Joined as independent consultant. Stabilization plan with engineering management, then led a project transformation. Promoted to Tech Lead.

  • Cut
    Deploy time by 70%+
    Ansible-driven on-prem server config and IaC pipelines, replacing manual processes.
  • Migrated
    Codebase to monorepo
    Overhauled developer experience. Faster local feedback loops, standardized tooling.
  • Hardened
    System security
    Introduced secure development practices with the security team. Resolved deep-rooted issues that had blocked the team.
Sep 2021 – Jan 2023
Remote · Concurrent

Technical Interviewer, SpaceBus

Contract: senior-engineer hiring interviews. Structured technical evaluation and feedback to candidates and hiring teams. Concurrent with Asurion.

Nov 2018 – Nov 2021
Remote

Senior Software Engineer, Travelport

Core engineer on TCP, a booking-automation platform for EU travel agents. Production launch 2021, all EU-based agencies enrolled.

  • Designed
    Microservices on AWS Lambda
    Serverless, Node.js, DynamoDB, S3, SNS, SQS. React frontend. Zero-downtime CI/CD.
  • Established
    Team testing framework
    Unit, integration, contract tests across the service boundary.
  • Hardened
    Authentication and session security
    Redesigned token management to protect agent sessions and reduce credential exposure risk.
May 2018 – Nov 2018
Tokyo

Full Stack Engineer, BEENOS

Customer-facing product-price aggregation service ranking deals from multiple marketplaces by availability and price.

  • Automated
    Multi-source data collection
    Marketplace APIs and scraping pipelines feeding the aggregation service. Preact (SSR), Node/Express, DynamoDB, S3.
  • Delivered
    Internal Preact CMS
    Built tooling for content operations. Redesigned parts of the application architecture to increase feature delivery speed.
Nov 2016 – Apr 2018
Malta · Remote

Frontend Developer, Earlier roles

Betting Entertainment LTD (Malta, on-site, 1yr+): maintained and customized a white-label betting product across ~35 client sites. Cut new-theme creation time by 50% via parametrized SASS architecture; shipped 20+ themes. SkyJump Technology (3-month freelance): SEO-friendly multi-step landing page with automated address lookup for a US solar energy company.

Full work history on LinkedIn ↗
Education · Donetsk Industrial & Pedagogical College, 2012–2014Languages · English · Ukrainian · Russian · Japanese (learning)
03 / Track Record

Where I've shipped.

Cogent LabsAsurionSpaceBusTravelportBEENOSSkyJump TechnologyBetting Entertainment[your company?]
10 years · 7 companies · 1 vacancyFill the slot →
04 / Selected Projects

What I build outside the day job.

Open-source developer tools, infrastructure work, and shipped product. The list is intentionally short: recent, public, and worth talking about.

01 / 2025Infrastructure

Personal homelab

Production-grade self-hosted infrastructure. Single-node Proxmox host running k3s with GPU passthrough. Three-stage provisioning, GitOps, two-tier backup, full observability stack.

PROXMOXK3SPULUMIANSIBLEARGOCDTRAEFIK+7
02 / 2024OSS · Platform

Marshant

Open-source feature flag platform. Self-hosted: flags, gradual rollouts, experiments. TypeScript and Next.js, designed for multi-tenancy and an open-core model.

TSNEXTPOSTGRESDOCKER
03 / 2023OSS · Tooling

gh-contribution-mate

GitHub CLI extension that syncs commits from local or non-GitHub repos to a GitHub profile, without exposing source or commit messages. TypeScript and Deno.

TSDENOCLI
04 / 2019OSS · Library

uapi-json

Open-source Node.js client for Travelport Universal API. Wraps booking, exchange, refund, and ticket retrieval across major GDS systems. 77 stars on GitHub.

NODEJS
All projects, indexed →
05 / Contact

Open file.

Open to Senior IC and Tech Lead roles.
Tokyo onsite/hybrid or global remote.

I read every cold message. The fastest path is email; LinkedIn is fine too. Outside day jobs I maintain open-source dev tools and run a homelab. That work feeds back: faster prototyping, sharper opinions on DX, less hesitation around touching infra.

EMAILmark@omarov.dev↗GITHUB@mark-omarov↗LINKEDIN/in/mark-omarov↗