Sulejman Sarajlija
@sulejmansarajlija
Software engineer specializing in blockchain backends, distributed systems, and scalable DeFi infrastructure.
Bosnia and HerzegovinaWhat I'm looking for
I’m a software engineer with 11 years of experience building high-performance backend services across blockchain technology, backend infrastructure, and distributed systems. I focus on designing scalable architectures, reducing operational costs, and shipping production-ready systems end to end.
Recently, I built Blockscanner monitoring services with a multi-chain approach (Ethereum and multiple L2s/sidechains, plus Solana), cutting API costs by 60–80%. I also developed big data tools for airdrop analytics and wallet correlation, and implemented TVL tracking with snapshotting and historical tracking—backed by a global caching layer to improve speed and reduce costs.
I’ve led security and growth integrations by expanding asset coverage 10× through Codex API and Blockaid security integrations, and I’ve modeled marketing campaigns for engagement and token distribution. I also created an AI-powered swap-debugger dashboard, and drove performance optimizations through caching, batching, query improvements, and stronger testing practices.
Across multiple roles, I’ve delivered decentralized architecture work (including incentivized snapshotting for on-chain data markets), contributed open source components running in staging and production, and built smart-contract and backend systems using AWS, microservices, and modern distributed tooling. I’m especially energized by teams that value clean engineering, fast iteration, and reliable decentralized infrastructure.
Experience
Work history, roles, and key accomplishments
Contract Software Engineer
DeFi App
Oct 2024 - Present (1 year 8 months)
Built Blockscanner multi-chain monitoring service (Ethereum, Arbitrum, Base, BNB, Solana), cutting API costs by 60–80%. Developed analytics and TVL snapshotting (snapshot engine, AWS Lambdas, global caching), and shipped security integrations that expanded asset coverage 10×.
Field Expert Lecturer
International Burch University
Apr 2024 - Sep 2024 (5 months)
Served as a Field Expert Lecturer (Blockchain Software Engineering), supporting instruction on blockchain architecture and decentralized systems concepts. Delivered guidance spanning snapshotting and distributed protocol components used in DeFi contexts.
Research Software Engineer
Zolar
Sep 2023 - Nov 2023 (2 months)
Collaborated with an external team to expand a solar services platform for the German market, including delivery of a buy-now-pay-later payment option. Contributed engineering work across the web stack to support platform and data integration changes.
Solidity & Fullstack Developer
HealthEx
Nov 2022 - Aug 2023 (9 months)
Developed a HealthEx DAO to manage access levels for medical research data and implemented transparent on-chain logic for record-keeping. Built trustless on-chain invitation systems for Gnosis Safe and researched wallets/account abstraction with backend indexing pipelines for on-chain data.
Distributed Systems Engineer
Powerloom Protocol
Sep 2022 - Jun 2023 (9 months)
Engineered decentralized data-market components for incentivized on-chain snapshotting, coordinating snapshotter nodes with sequencer/validator logic. Contributed to open-source code used in staging and production for on-chain data rewards workflows.
DeFi Backend Software Engineer
Alloy Capital
Jun 2022 - Oct 2022 (4 months)
Designed and implemented backend services for a DeFi application, syncing blockchain data and implementing transaction logic via external custodian APIs. Integrated web3 wallets (MetaMask and WalletConnect) and built on-chain investment strategy systems through custodian workflows.
Zero-Knowledge Software Eng
Panther Protocol
May 2021 - Jun 2022 (1 year 1 month)
Worked on zero-knowledge proof implementations and EVM privacy-related features in the Panther Protocol web client. Contributed to anonymous DAO launch software and participated in core protocol development.
Blockchain Developer
Ministry of Programming
Sep 2020 - Feb 2021 (5 months)
Delivered blockchain development and consulting across multiple projects, including work on Cosmos SDK-based systems and Corda components. Contributed to zero-knowledge proof related development tasks.
Freelance Blockchain Consultant
Upwork
Sep 2019 - Aug 2020 (11 months)
Delivered freelance blockchain consulting and small-project development spanning distributed storage, P2P networking, and DeFi-related protocol work. Implemented and supported systems using Cosmos SDK and additional blockchain/utility components.
Software Engineer (IoT & Learning)
HUB387
Oct 2014 - Aug 2019 (4 years 10 months)
Worked across IoT and e-learning platforms, contributing to backend, DevOps, and embedded systems for an IoT beekeeping product and leading development of an online video-learning platform. Managed full-stack delivery using web and backend services plus embedded systems design.
Software Engineer / Researcher
Altcoin.io
Sep 2017 - Jul 2019 (1 year 10 months)
Developed and researched decentralized exchange technologies including ERC20 DEX designs, atomic swaps, state channels, and plasma. Led backend and smart contract work and achieved the first atomic swap between Ethereum and Bitcoin, while helping pioneer a second-layer DEX.
Education
Degrees, certifications, and relevant coursework
International Burch University
Bachelor of Computer Science, Computer Science
Completed a Bachelor of Computer Science at International Burch University in 2014, with coursework including Node.js/TypeScript, Prisma, PostgreSQL/Redis, AWS Lambda/CDK, Docker, and web3/blockchain-related development.
Availability
Location
Bosnia and HerzegovinaAuthorized to work in
Job categories
Skills
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