teemu

Worked on cross-chain asset infrastructure, building Solana-based programs and backend services for tokenized asset transfers and settlement. Designed and implemented Rust-based Solana programs using Anchor to support tokenized asset issuance and settlement, processing more than 2M transactions with deterministic account handling and optimized compute unit usage. Built Node.js and NestJS microservices that interfaced with Solana RPC nodes and EVM bridges, reducing cross-chain confirmation latency by roughly a third after reworking indexing and retry logic. Implemented on-chain name and asset resolution logic integrated with PostgreSQL indexers and Redis caching, improving query response times from seconds to sub-200ms under peak load. Developed lending and collateral locking mechanics inspired by DeFi patterns, enforcing on-chain validation and off-chain risk checks that secured over $120M in bridged assets. Hardened smart contracts through internal audits, property-based testing, and simulation scripts, preventing several edge-case exploits before mainnet deployment. Containerized services with Docker and deployed to Kubernetes on AWS, introducing CI/CD pipelines that shortened release cycles from biweekly to several times per week without increasing incident rate. Maintained direct communication with product and protocol designers to translate ambiguous tokenization requirements into concrete account schemas and upgrade paths. Handled production incidents involving RPC instability and indexer drift, documenting tradeoffs and recovery steps to keep the system stable during high-volume events.

Developed backend platforms and early-stage blockchain integrations for fintech and digital asset clients. Implemented Solidity smart contracts for token issuance and staking, later integrating them with Node.js APIs that supported daily transaction volumes in the high six figures. Built REST and GraphQL services using TypeScript and PostgreSQL for digital asset dashboards, introducing query optimization and indexing that cut average report generation time by half. Integrated third-party oracles to feed off-chain price data into smart contracts, adding fallback validation logic to reduce faulty updates during volatile market conditions. Deployed containerized services to Google Cloud and DigitalOcean, configuring CI pipelines and environment isolation to improve deployment reliability across staging and production. Refactored legacy MySQL schemas into normalized PostgreSQL models to better support transactional integrity required by financial applications. Introduced automated testing with Jest and contract-level test suites, reducing regression issues in releases over time. Regularly clarified technical constraints to non-technical stakeholders when blockchain limitations conflicted with product expectations, helping reset scope without derailing timelines.

Contributed to backend systems for SaaS analytics products focused on high-volume event processing. Developed Node.js services backed by MySQL to process and aggregate millions of user events per day, tuning queries and indexes to stabilize performance under growth. Implemented authentication flows and role-based access control that aligned with early GDPR requirements for EU customers. Improved API response consistency by introducing structured logging and integration tests, which reduced production debugging time noticeably. Assisted in migrating parts of the monolith toward service-oriented components, gaining early exposure to distributed system tradeoffs. Balanced feature work with technical debt cleanup, gradually learning to reason about scalability beyond immediate sprint goals.

Supported backend feature development for internal business tools and small client projects. Built CRUD APIs in Node.js with MySQL for internal workflow systems, improving data consistency and reducing manual spreadsheet handling. Wrote unit tests and fixed production bugs under guidance from senior engineers, gradually understanding how small schema decisions affect long-term maintainability. Learned disciplined version control and code review practices from senior developers, which shaped how I approach reliability and clean interfaces today.