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(bio)

Sebastian Strandberg

Senior Software Consultant

Co-founder & CTO, Dua Digital.

Bali · remote worldwide

Swedish-born, Bali-based. Husband and dad. Co-founded Dua Digital in 2021 after a decade shipping Java, Android and web apps for clients like Wireless Car, Bring and New Zealand Post. Happiest as an architect who still writes code, working in small teams on long client relationships. Believe in removal over addition; the second-best software disappears.

(work)

long-term engagements

Downstairs AB

Led a team of four through a full stack rewrite of a Swedish cleaning-service client's platform. Legacy CodeIgniter portal migrated to modern Laravel, Fortnox integration, customer and worker mobile apps, and a new point-of-sale system. 3+ years; relationship ongoing.

since late 2022

Simply BRF

Technical lead on a Swedish platform for housing cooperatives — super-admin for onboarding new communities, admin web for community boards, plus a member web and matching iOS/Android apps. Communication and shared-facility bookings (laundry, sauna). Stack: AWS, Node.js, React, React Native.

since 2023

other engagements

agentic products

internal tooling

(stack)

the whole pipeline

platforms & architecture: AWS (ELB, API Gateway, Lambda, RDS) · Azure · Railway · Supabase · container-based deployment (Podman, Docker) · SELinux-hardened Linux · API & service design · headless / MCP-served back-ends · event-driven and batch architectures · legacy-to-modern migrations.

ai / agentic: Prompt and system design · tool use · custom agent harnesses · RAG and knowledge-base integration · MCP server design · local-model experimentation · token and rate-limit economics · reusable skill chains and agentic delivery workflows. Fine-tuning is the one layer I haven’t yet taken to production.

daily working tools: Claude (incl. Claude Code) · OpenAI · Gemini · GitHub Copilot · Cursor · OpenCode · Pi.

delivery: Scrum, agile delivery · customer discovery, offer and contract authoring · architecture decision records and technical documentation · key-account ownership from requirements to handover.

stack experience: TypeScript / JavaScript (Next.js, React, React Native, Node.js) · Python (Django) · Java / Spring Boot · PHP · iOS & Android · SQL / MySQL.

industries: IoT & Home Energy · PropTech / Housing · Hospitality & F&B · E-commerce · iGaming / Web3 · Automotive · Post & Logistics · Games

(history)

before dua digital

PT. Dua Digital Solutions — Co-founder & CTO · 2021 – present Swedish-owned Indonesian consultancy. Nordic clients, remote worldwide.

Strandberg Development AB — Sole trader · 2020 – 2023 (company now frozen) Swedish sole-trader vehicle used in parallel to Dua Digital for smaller direct engagements. No activity since 2023.

Omegapoint Göteborg AB — IT Consultant · 2017 – 2020 Application specialist on the Volvo On Call platform via Wireless Car for the full engagement. Java enterprise, Cucumber; close collaboration with Volvo Connected Cars.

PocketMobile Communications AB — Android Developer · 2015 – 2017 Android developer on custom post-and-logistics solutions for Bring and New Zealand Post (including on-site end-user research in NZ). Also served as Product Owner for a remote product-framework team in Sri Lanka.

University of BoråsFilosofie Kandidat, Systems Architecture programme (Informatics) · 2012 – 2015 The foundation for my systems and architectural thinking.

(contact)

best way to reach me is email.

sebastian@duadigital.com