Alex Sergeyev

Senior Technical Lead | Startup CTO Stockholm, Sweden

alex.sergeyev@gmail.com | +46707147896 | LinkedIn | GitHub

Summary

Senior Technical Lead with 15+ years leading engineering teams and delivering complex technical transformations. Proven expertise in Technical Due Diligence (15+ M&A assessments), architecture modernization, and turning underperforming systems into scalable products. Hands-on leader combining strategic vision with deep technical execution across the full stack.

Languages: Ruby, Python, Elixir, JavaScript, TypeScript, Lua

Technical: AWS, Azure, GCP, Kubernetes, Docker, Terraform, PostgreSQL, MongoDB, Elasticsearch, Kafka, Redis, GraphQL, REST, Microservices, CI/CD, AI/ML (LangChain, RAG)

Leadership: Technical Strategy, Technical Due Diligence, Engineering Management, Budget Management, Agile, Hiring, Team Mentoring, Stakeholder Management

Experience

Technical Lead / Product Owner, Cloud Platform

Postnord | Nov 2024 - Present

Leading Cloud Platform strategy for one of the Nordic region's largest logistics companies.

• Define cloud strategy and lead budget planning as member of Architecture Board.
• Build developer self-service platform (Backstage) for 100+ engineering teams.
• Design and build custom FinOps solution for internal cost distribution, achieving 20-30% annual savings.
• Define processes to enforce and verify compliance standards (ISO 27001, NIS2, GDPR) in cloud.
• Lead Terraform adoption and Infrastructure as Code practices organization-wide.

Founder

Mooracle AB, Stockholm | May 2023 - Present (Part-time)

• Consulting: technical due diligence and fractional CTO.
• Product: Hamstiq — AI-powered collection management (LangChain, RAG).
• Product: IoT analytics and reporting tool for industrial sensor data.

Senior Technical Lead

HiQ, Stockholm | Sep 2022 - Nov 2024

Technical Due Diligence and architecture consulting for PE firms, VCs, and growth-stage startups across SaaS, e-commerce, and IoT sectors.

• Executed 15+ Technical Due Diligence assessments for M&A transactions across diverse tech stacks.
• Advised startups on scaling and post-acquisition integration; assessed organizational capabilities.
• Rescued scientific publications platform: 10x Azure cost reduction, 95% performance gain.
• Led post-acquisition security hardening: vulnerability remediation, Terraform automation, DR planning.
• Consolidated two IoT platforms (7,000 devices) using AWS IoT Core, Kinesis, MQTT — 30% cost reduction.

Technical Lead

Netronix, US (remote) | Nov 2014 - Aug 2022

Led engineering for IoT startup (10,000+ sensors globally). Scaled team 3→10, built processing backbone from device gateway to user APIs.

• Defined product roadmap and technical strategy in collaboration with CEO and stakeholders.
• Built and led engineering team: hiring, mentoring, performance reviews, and career development.
• Managed vendor relationships, technical budgets, and infrastructure costs.
• Established engineering processes: Agile, code reviews, CI/CD, and documentation standards.
• Architected and built time-series processing engine (Redis, MongoDB, PostgreSQL).
• Designed REST, GraphQL, WebSocket APIs; built protobuf/MQTT device transport.
• Implemented IaC for AWS/Kubernetes achieving 100% AWS Security Hub compliance.
• Transitioned monolith to microservices (Ruby/Elixir) using NATS.io.
• Built Lua SDK for 200+ sensor drivers from 50+ vendors.
• Developed sensor calibration tooling with ML models (Python, scikit-learn).

Senior Software Engineer

Mynewsdesk, Stockholm | Aug 2013 - Nov 2014

Built social media monitoring tool (1,000+ req/sec) using Ruby on Rails and Elasticsearch. Led zero-downtime cloud migration to Heroku.

Earlier Experience

• Netronix — Senior Software Engineer (2011 - 2013)
• Vizrt — Software Engineer (2011)
• Freelance — Consultant (2010 - 2011)
• Playfon Sweden AB — Developer, Senior Developer (2005 - 2010)

Publications

• Building IIoT That Lasts: 10 Lessons from a Decade in the Field
• The Three Person Constraint: Why Limiting Your Team Forces Better Products

Education

Bachelor of Science in Computer Science Belarusian State University of Informatics and Radioelectronics | 2002 - 2007

Certifications

AWS Certified Solutions Architect – Associate | AWS | 2024 - 2027

Languages

English (Full professional), Swedish (Limited working)