maakbay
Senior Software Engineer — Backend / Blockchain
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Senior Software Engineer with 7+ years of experience building scalable backend and blockchain systems. Expert in Go, TypeScript, and distributed data systems. Deep understanding of custody wallet architectures, cryptography, and high-performance infrastructure. Skilled in designing reliable APIs, event-driven systems, and NoSQL databases with a strong focus on observability and maintainability.
Experience: 6 years
Yearly salary: $130,000
Hourly rate: $100
Nationality: 🇹🇷 Turkey
Residency: 🇩🇪 Germany
Experience
Senior Software Engineer
Finoa GmbH 2022 - 2026
Built API services (TypeScript, C++) for end-user custody wallets and Go microservices for wallet, transaction, and balance management. Worked intensively with PostgreSQL, AWS Step Functions, and Kafka for distributed orchestration. Developed Web3 adapters (WalletConnect-compatible providers) for in-custody ETH wallets. Worked on cryptography around MPC and multi-party 2FA with stateless-HSMs. Implemented Prometheus metrics and flexible Grafana dashboards for deep observability.
Co-Founder
Contenta.Ai 2021 - 2023
Built an AI-driven content discovery platform on GCP using TypeScript, Node.js, Go, PostgreSQL, and MongoDB.
Senior Software Developer
collectAI (Otto Group) 2021 - 2022
Led backend modernization with Terraform, AWS, and Node.js, improving deployment pipelines and reliability.
Software Developer
Plutus 2021 - 2021
Maintained an exchange platform with trading bots in TypeScript/Node.js on Google Cloud.
Blockchain Developer
BC Development Labs GmbH 2020 - 2021
Developed Bitcoin and Ethereum block scanners to manage and update on-chain balance states, transaction histories, and event tracking for internal custody wallet operations.
Skills
nosql
rust
sql
typescript
golang
english