Nikifor is available for hire
Hire NikiforNikifor Seriakov
Verified Expert in Engineering
Mathematics Developer
Location
Yerevan, Armenia
Toptal Member Since
April 14, 2022
Nikifor is a business oriented software engineer with nearly a decade of experience building simple solutions for complex problems. He specializes in building custom solutions when existing systems become too heavy, expensive, or unstable. Nikifor digs deep into the systems he works with.
Portfolio
Freelance
Go, Ethereum, ClickHouse, Data Analytics, Docker, Back-end, Back-end Development
Freelance
Go, API Integration, APIs
FinTech Association
Blockchain, Go, Fintech Consultant, Cryptography
Experience
Availability
Part-time
Preferred Environment
Vim Text Editor, Terminal, Linux
The most amazing...
...algorithms I've designed are for financial processing, distributed fault-tolerant databases, and image forgery detection.
Work Experience
Ethereum Specialist
2020 - 2022
Freelance
- Developed ClickHouse reverse-proxy making on the fly pre-calculations, including implementation of ClickHouse binary protocol.
- Added Ethereum API handlers for client needed features.
- Sped up receiving and sending transactions by adding straight paths instead of queued and buffered ones.
- Analyzed network messaging statistics. Made reports for which nodes are more effective, which peers are more practical, and where to add new nodes.
Technologies: Go, Ethereum, ClickHouse, Data Analytics, Docker, Back-end, Back-end Development
Problem Solver
2020 - 2021
Freelance
- Integrated the two new crypto exchange platforms, implemented an API client, and integrated API logic into the existing system.
- Implemented combined order book and market depth from multiple exchanges with the ability to split orders according to current exchange prices.
- Solved bugs and made improvements to the existing system.
Technologies: Go, API Integration, APIs
Problem Solver
2019 - 2020
FinTech Association
- Fixed some service failures in a few days that the client's team couldn't solve for half of the year.
- Led the development of one of the services, mostly business logic and back-end part.
- Transitioned the existing banks' and financial institutes' business logic to the blockchain.
- Developed some of the core functionalities and smart contracts.
Technologies: Blockchain, Go, Fintech Consultant, Cryptography
Head of Research
2016 - 2019
Research and Development Center
- Created a fault tolerance algorithm as part of the financial processing development.
- Contributed to the distributed financial database development by creating a consistency algorithm.
- Developed SNMP-based discovery service as part of the office discovery and accounting software, which scanned clients' networks quickly and efficiently.
Technologies: Algorithms, APIs, Architecture, Back-end, Back-end Development, Bash, Bash Script, C, Clojure, Consensus Algorithms, Distributed Systems, Docker, Fault Tolerance, Go, gRPC, Linux, Internet of Things (IoT), Mathematics, REST APIs, SQL, System Design, Terminal, Vim Text Editor, MongoDB, NoSQL
Software Developer
2011 - 2014
SMTDP
- Led the development of MVP and defined the main principles of the system that existed for at least five years of product life.
- Acted as the lead of the algorithms department and oversaw the system in general, running the algorithms, and combining its results.
- Implemented two image forgery detection algorithms.
Technologies: Image Processing, Algorithms, Architecture, Back-end, Bash, Bash Script, C, Java
Experience
Distributed Database for Financial Transactions
Created a specialized database for financial processing. It provided the same guarantees as the database Cassandra but cost four times less. It worked with nearly the same performance with one less datacenter, It also passed the Jepsen framework test.
I did a significant part of the design and implementation job cooperating with my colleague.
I did a significant part of the design and implementation job cooperating with my colleague.
Distributed Financial Processing
https://github.com/qiwitech/qdpDistributed fault-tolerant but lightweight financial processing. Worldwide setup recovered from datacenter failure in three seconds while maintaining correctness and making double spends impossible. This allowed us to achieve the highest SLA of availability. I was the main author of recovering algorithm.
Recommendation System
I've replaced the recommendation system built of tens of parts and vendor dependencies with a tiny setup with the same results.
The full cycle of data flows from the production database to get predictions involving only Clickhouse, Catboost library, and a couple of bash scripts.
The full cycle of data flows from the production database to get predictions involving only Clickhouse, Catboost library, and a couple of bash scripts.
Skills
Languages
Go, Bash, Bash Script, C, SQL, Clojure, JavaScript, Python, Java
Tools
Terminal, Vim Text Editor
Platforms
Linux, Ethereum, Docker, Blockchain
Storage
ClickHouse, NoSQL, MongoDB, PostgreSQL
Other
Back-end, Back-end Development, Mathematics, Algorithms, Consensus Algorithms, Distributed Systems, Fault Tolerance, System Design, Data Analytics, Architecture, APIs, Machine Learning, Internet of Things (IoT), Image Processing, Fintech Consultant, Cryptography, API Integration
Frameworks
gRPC
Libraries/APIs
REST APIs, CatBoost
Education
2011 - 2014
Incomplete in Computational Mathematics and Cybernetics
Moscow State University - Moscow, Russia
Collaboration That Works
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