Available to hire
I’m Matthew Kriel, a Senior Software Engineer with over 15 years of experience spanning engineering and technical product management. I’ve founded and sold a software company, led product initiatives, and I’m focused on building reliable systems and writing clean, maintainable code.
I thrive in collaborative environments, love solving hard problems, and I’m passionately curious about databases and scalable architectures. Outside work, I coach Brazilian jiu-jitsu, practice photography, hike with friends, and I contribute to my World of Warcraft guild, leading a team of over 25 players.
Skills
Experience Level
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
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Expert
Expert
Expert
Expert
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Intermediate
Language
English
Fluent
Afrikaans
Fluent
German
Fluent
Aragonese
Advanced
Work Experience
Senior Software Engineer at Stubber
February 1, 2025 - PresentAt Stubber I build the systems that power our AI automation platform. I work on the core engine that drives the platform as well as distributed services that extend its capabilities. The systems are complex, fast-moving, and always evolving, making the work both challenging and exciting. Recent work includes building external messaging integrations for Telegram, Slack, and Microsoft Teams through new microservices integrated into the platform, extending and improving a Google Sheets integration, optimizing LLM pipelines for performance and reliability, and writing documentation and planning materials to support scaling and maintainability.
Senior Backend Engineer (Contract) at Sociable
December 1, 2024 - PresentSociable is a community-focused events platform designed to help people connect through shared passions and real-world experiences. It allows users to discover nearby events in real time, filter by interest or location, and build personalized profiles to engage with others. I recently joined the team at Sociable as a backend engineer. My latest contracted work involved a complete migration from JavaScript to TypeScript of the backend services, making UI adjustments to the mobile app, and writing a comprehensive test suite for the platform.
Senior Technical Product Manager (Contract) at CV Library
November 30, 2024 - September 5, 2025CV Library is one of the UK's largest independent job boards, offering a comprehensive platform for job seekers and employers alike. I was contracted for and successfully led the migration of the company's legacy monolithic platform to a micro-service event-driven architecture, resulting in monthly billing savings of $24,000.
Senior Technical Product Manager (Contract) at Skrmiish
January 31, 2024 - September 5, 2025Skrmiish is a mobile play-to-earn platform enabling gamers to earn real cash by completing skill-based challenges in popular AAA titles like Fortnite, Valorant, and Call of Duty: Warzone. Through its unique Money Match system, players compete against their own performance metrics. I wrote specifications and code that directly led to a 34% increase in user registrations, a 100% increase in average entry value per match, and a 50% increase in games played per day. I implemented processes and procedures that increased engineering output by over 50% and completed 98 engineering tickets.
Technical Product Manager (Contract) at Rebel Bots
December 31, 2022 - September 5, 2025Rebel Bots is a Web3 gaming studio blending traditional gameplay with blockchain technology to create immersive play-to-earn experiences. Their flagship title, Xoil Wars, is a sci-fi strategy card battle game with PvP battles. I successfully led the team to deliver a closed beta version with a 98.4% positive feedback rate from 800 users. I contributed daily coding to the company website and marketplace, and grew the user base by 44% during the contract period.
Senior Technical Product Manager at Invictus Capital
May 31, 2022 - September 5, 2025Invictus Capital is a blockchain-based investment platform democratizing access to alternative assets through tokenized funds. I coordinated the migration of all investor funds from the Ethereum to Polygon network (handling $250,000,000 AUM), decreased investor withdrawal rate by 30%, and increased investments into the Yield Vault product by 50%. I also made various coding contributions to the company website.
Senior Software Engineer at Stubber
February 1, 2025 - PresentAt Stubber, I build the systems powering our AI automation platform, working on the core engine and distributed services to extend its capabilities. The systems are complex and fast-moving, which makes the work challenging and exciting. Recent projects include building external messaging integrations for Telegram, Slack, and Microsoft Teams using new microservices, extending and improving our Google Sheets integration, optimizing LLM pipelines for performance and reliability, and writing documentation to support scaling and maintainability.
Senior Backend Engineer (Contract) at Sociable
December 1, 2024 - PresentSociable is a community-focused events platform designed to help people connect through shared passions and real-world experiences. I recently joined as a backend engineer, working on migrating the backend services from JavaScript to TypeScript, making UI adjustments to the mobile app, and writing a comprehensive test suite for the platform.
Senior Technical Product Manager (Contract) at CV Library
November 30, 2024 - September 5, 2025Led the migration of the company’s legacy monolithic platform to a microservice, event-driven architecture, resulting in a monthly billing savings of $24,000. CV Library is one of the UK's largest independent job boards with a database exceeding 21 million CVs, enabling employers to connect with a vast talent pool.
Senior Technical Product Manager (Contract) at Skrmiish
January 31, 2024 - September 5, 2025Skrmiish is a mobile play-to-earn platform for gamers completing skill-based challenges in popular AAA titles. I wrote specifications and code leading to a 34% increase in user registrations, doubled average entry value per match, and increased games played per day by 50%. I implemented processes that boosted engineering output by over 50%, completing 98 engineering tickets during the contract.
Technical Product Manager (Contract) at Rebel Bots
December 31, 2022 - September 5, 2025Rebel Bots is a Web3 gaming studio blending traditional gameplay with blockchain technology. I successfully led the team to deliver a closed beta version of their flagship sci-fi strategy card battle game with a 98.4% positive feedback rate from 800 users. I contributed daily coding to the company website and marketplace, growing the user base by 44% during my contract.
Senior Technical Product Manager at Invictus Capital
May 31, 2022 - September 5, 2025Invictus Capital is a blockchain-based investment platform offering tokenized funds. I coordinated the migration of investor funds from Ethereum to the Polygon network managing $250 million AUM, decreased investor withdrawal rate by 30%, and increased investments into the Yield Vault product by 50%. I also contributed coding to the company website.
Senior Software Engineer at Stubber
February 1, 2025 - PresentBuilt and maintained an AI automation platform's core engine and distributed services, including integrating external messaging (Telegram, Slack, Microsoft Teams) and expanding data workflows. Authored documentation and collaborated on performance optimizations to support rapid feature delivery.
Senior Technical Product Manager at CV-Library
November 1, 2024 - September 15, 2025Led the migration of a legacy monolithic platform to a microservices architecture in a contract role, aligning product strategy with engineering execution, coordinating cross-functional teams, and delivering measurable improvements in reliability and performance.
Senior Technical Product Manager at Skrmiish
January 31, 2024 - September 15, 2025Defined product strategy and roadmaps for a mobile gaming ecosystem, established metrics and success criteria, and guided engineering efforts through major feature updates and platform migrations.
Senior Technical Product Manager at Rebel Bots
December 31, 2022 - September 15, 2025Led migration and growth initiatives for a Web3 gaming studio, coordinating product and engineering work, delivering a closed beta for PvP battles, and expanding platform capabilities with new monetization features.
Senior Technical Product Manager at Invictus Capital
May 31, 2022 - September 15, 2025Directed migration and product initiatives across crypto-focused investment platforms, introducing decentralized workflows, expanding Yield Vault components, and coordinating cross-functional delivery to accelerate time-to-value.
Senior Software Engineer at Stubber
February 1, 2025 - PresentI build and maintain the core AI automation platform, work on the Stubber core system and distributed services, and have led the development of external messaging integrations (Telegram, Slack, Microsoft Teams), extended Google Sheets integration, and optimized LM pipelines for performance and reliability. I also write documentation and planning material to support scaling and maintainability. Tech stack includes JavaScript, Next.js, MongoDB, React Native, Node.js, and related tooling.
Senior Technical Product Manager at CV Library
November 1, 2024 - September 15, 2025Led the migration of the company’s legacy monolithic platform to a microservices architecture, enabling faster iterations and improved scalability. Drove cross-functional delivery across engineering and product teams, contributed to architecture decisions, and supported scaling initiatives. Notable outcomes included cost efficiency and performance improvements.
Senior Technical Product Manager at Invictus Capital
May 1, 2022 - September 15, 2025Coordinated migration of investor funds to tokenized, decentralized structures and led product initiatives to democratize access to alternatives. Oversaw migration KPIs, withdrawal metrics, and yield vault adoption to improve investor experience.
Senior Technical Product Manager at Rebel Bots
December 1, 2022 - September 15, 2025Led product management for a Web3 gaming studio blending traditional gameplay with blockchain technology. Established product roadmap, coordinated cross-functional teams, and oversaw feature implementation and delivery.
Senior Technical Product Manager at Skrmiish
January 1, 2024 - September 15, 2025Led product strategy and execution for backend services, collaborated with engineering to define roadmaps, and ensured timely delivery of features. Worked with cross-functional teams to refine requirements and drive adoption.
Senior Software Engineer at Stubber
February 1, 2025 - PresentBuilds the AI automation platform's core systems and distributed services; engines powering the platform; implemented external messaging integrations (Telegram, Slack, Microsoft Teams) and enhanced data workflows (Google Sheets integration). Focused on performance, reliability, and scalable Go/Node microservices.
Senior Technical Product Manager at Skirmish (skirmish.gg)
January 31, 2024 - October 7, 2025Led a 12-month contract: migrated architecture from JavaScript to TypeScript; built back-end API and front-end components for a play-to-earn mobile/web platform; contributed to a beta release and ongoing product roadmap.
Senior Technical Product Manager at Invictus Capital
May 31, 2022 - October 7, 2025Leading migration and product initiatives: migrated investor funds to the Ethereum → Polygon ecosystem, reduced withdrawal rate, and expanded Yield Vault investments by ~50%. Coordinated cross-functional engineering and product efforts.
Senior Technical Product Manager at Rebel Bots
December 31, 2022 - October 7, 2025Led development of X Oil Wars, a sci-fi card battler on a Web3 play-to-earn model. Delivered a closed beta, expanded resources (in-game assets), and grew the user base by 44% during the contract. Wrote daily code contributions and built out the company website and marketplace.
Assistant Coach at Pride Fighting Academy
November 1, 2024 - PresentAssistant coach since November 2024; coaching Brazilian jiujitsu for all ages and skill levels, with a focus on foundational technique and iterative improvement.
Senior Software Engineer at Stubber
February 1, 2025 - PresentBuilds systems powering an AI automation platform; core engine; distributed services; integrating external messaging (Telegram, Slack, Microsoft Teams); improving Google Sheets integration; optimizing LLM pipelines for performance and reliability; writing documentation and planning material to support scaling and maintainability.
Senior Technical Product Manager at Invictus Capital
May 31, 2022 - October 7, 2025Blockchain-based investment platform; coordinated migration of investor funds from Ethereum to Polygon; reduced investor withdrawal rate by 30%; increased investments into Yield Vault product by 50%.
Senior Technical Product Manager at Rebel Bots
December 31, 2022 - October 7, 2025Led a migration and feature development for a mobile play-to-earn platform, including a sci-fi card-battle framework and core backend orchestration to support PvP battles with in-game resources.
Senior Technical Product Manager at Skrmiish
January 31, 2024 - October 7, 2025Contract role delivering backend platform improvements, migrating key services from JavaScript to TypeScript, implementing test suites, and improving reliability and maintainability for a high-velocity product.
Education
Diploma (NQF 5) in Information Systems Engineering at University of Cambridge (Correspondence)
January 1, 2008 - December 31, 2008Diploma (NQF 5) at University of Cambridge (Correspondence)
January 1, 2008 - September 5, 2025Diploma (NQF5) at University of Cambridge (Correspondence)
January 1, 2008 - September 15, 2025Diploma (NQF5) at University of Cambridge (Correspondence)
January 11, 2030 - January 1, 2008Qualifications
AWS Cloud Practitioner Certification
March 1, 2024 - September 5, 2025AWS Cloud Practitioner
March 1, 2024 - September 5, 2025AWS Cloud Practitioner
March 1, 2024 - September 15, 2025AWS Cloud Practitioner
March 1, 2024 - September 15, 2025AWS Cloud Practitioner
March 1, 2024 - October 7, 2025AWS Cloud Practitioner
March 1, 2024 - October 7, 2025Diploma (NQF 5)
January 1, 2008 - October 7, 2025Industry Experience
Software & Internet, Gaming, Financial Services, Education, Media & Entertainment, Professional Services, Other
Skills
Experience Level
Expert
Expert
Expert
Expert
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Intermediate
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