Full Stack Engineer

Open to full-time

Bio

Seyi O. is a Full Stack Engineer with over six years of experience in building backend services and web infrastructure, particularly in the fintech and blockchain domains. His core stack includes TypeScript, Go, Ruby on Rails, and Node.js, which he uses to build APIs, microservices, and data pipelines. Seyi is adept at leveraging AWS Lambda for serverless architectures and employs CI/CD practices to maintain high uptime and performance. He is also experienced with various datastores like PostgreSQL, MongoDB, and DynamoDB. One of Seyi's notable projects is the "Lighthouse" API, which reports fraudulent user actions in a GDPR-compliant manner using AWS Lambda functions with Golang and Node.js. At Helicarrier Inc., he reduced fraud by over 90% and cut cloud infrastructure costs by over 250% through strategic migrations and optimizations. Seyi holds a B.Eng from Covenant University. He is best suited for roles that involve backend development and infrastructure optimization in fintech and blockchain, where he can apply his extensive technical expertise and passion for innovative solutions.

Expertise

MongoDBRuby on RailsNode.jsSQLPythonReactAWSTypeScriptReact NativeGoDocument DatabaseRelational Database

Video Intro

Assessments

General Coding Assessment

(93/100)

Perfect score on SQL QuestionHard
Two Algorithm QuestionsMedium
Good score on LRU Cache QuestionMedium

Projects

Lighthouse

An API for reporting actions of fraudulent users in a GDPR-compliant manner to be shared by fintech operators, leveraging AWS lambda functions in Golang and Nodejs.

David’s Sling

A trading bot written in Rust that implements trading strategies (like DCA, limit orders, stop loss, etc.) for Solana crypto traders.

Experience

Software Consultant
MemecasterApr 2024 — Present
- Implemented price feeds of curated Farcaster coins on Base and Solana.
- Implemented automated smart contract and EVM interactions leveraging ERC-2612 for gasless approvals on ERC 712 and 1155 tokens.
- Implemented support for seamless and secure chain-agnostic and decentralized trading leveraging Account Abstraction.
- Contributed to a cross-chain & decentralized betting experience leveraging popular bridges (Bungee, Lifi), Polymarket, and Account Abstraction.
- Built data pipelines that index and filter thousands of events from Farcaster channels into a curated feed, allowing traders to make sentiment-based decisions on assets.
GolangNodejs0x APIseth-goViemEthereum
Senior Software Engineer
Helicarrier Inc.Mar 2022 — Mar 2024
- Contributed to a trustless peer-to-peer (P2P) on/off ramp leveraging ERC 4337 and zkP2p.
- Improved fiat payout completion success rates by integrating fiat payout redundancies, introducing smarter routing, and retry mechanisms.
- Cut fraud by over 90% and chargebacks by introducing unique identification and AML features.
- Contributed to over 45% month-on-month growth by introducing rapid experimentation and implementation sprints.
- Reduced cloud infrastructure costs by over 250% by switching cloud infra providers in a data migration sprint that saw migrations of thousands of users and thousands of transactions and addresses.
- Maintained 99% uptime by enforcing adherence to CI/CD best practices, leveraging Infrastructure as code, and weekly deployments.
- Improved user satisfaction by enhancing user analytics and customer support efficiency with internal tools like Retool, Metabase, Mezmo (LogDNA), and Sentry.
- Contributed to maintaining the wallet infrastructure for Bitcoin, Ethereum, and Tron Addresses.
Ruby/RailsTypescriptGoNodeJsRetoolPostgres
Software Engineer
Olog.meJan 2020 — Feb 2022
- Contributed to improved user retention and engagement with notification services.
- Led the implementation of CD strategy for serverless backend using infrastructure as code (YML, CDK for cloud formation).
- Slashed developer onboard time by over 50% by testing and documenting all codebases.
- Onboarded and supervised younger engineers.
TypescriptNode.jsAWS LambdaDynamoDBReact (Redux)React Native
Software Consultant
ShopthruSep 2022 — Feb 2023
- Set up ETL pipelines and analytics that produced genuine insight into the market segment and the utility of the product.
- Improved UX by performing research into wallet libraries and their impact on first-time crypto users.
- Investigated and fixed high-impact bugs and created documentation policies and guidelines.
- Built the backend systems for a new product line, Deals marketplace, to stimulate sales growth and customer loyalty for users and onboard new people into crypto.
NodejsReactEthers.jsGCPDockermixpanelRetoolMongoDb
Software Developer
Evolucionar ConsultingJan 2018 — Feb 2020
- Designed, prototyped, and coordinated a team that built data analytics software to measure and report IT adoption in government offices nationwide.
- Built E-commerce sites for clients.
NodeJsLaravelwordpressGoogle APIs