Daniel Nenkov, Software Developer in London, United Kingdom
Daniel Nenkov

Software Developer in London, United Kingdom

Member since March 25, 2019
Daniel is adept at digging into complex problems to find innovative solutions that benefit both the company and their clients. Most recently, he has created a digital challenger bank for SMEs, led a team that changed the way people apply for divorce in the UK, and created an award-winning multi-factor authentication platform that was featured in Tech Crunch and WSJ. He's looking forward to tackling his next challenge.
Daniel is now available for hire

Portfolio

Experience

  • SQL, 13 years
  • Java, 13 years
  • Web, 13 years
  • JavaScript, 10 years
  • Git, 7 years
  • Agile, 7 years
  • Spring, 5 years
  • Spring Boot, 5 years

Location

London, United Kingdom

Availability

Part-time

Preferred Environment

IntelliJ, Git

The most amazing...

...project I have worked on is a challenger bank for small businesses in the UK.

Employment

  • Senior Engineer

    2018 - 2019
    Mettle
    • Contributed to the development of Mettle, a standalone SME challenger bank launched by RBS that provides a current account, instant invoicing, and the ability to add receipts to transactions and track expenses from a mobile app.
    • Extended and maintained existing and created new microservices which fit the event sourcing architecture of the Mettle platform.
    • Added features to the React Native mobile banking application.
    • Migrated the event stream to AVRO so we could implement continuous deployment.
    • Extended the automated test suite by introducing consumer-driven contract tests (Pact).
    • Created an interactive dashboard to track business and team OKRs.
    Technologies: Java, Spring, Spring Boot, Kafka, React, React Native
  • Technical Lead

    2017 - 2018
    Ministry of Justice, UK
    • Ensured the divorce microservices fit in the overall high-level design of the reform program. This involved regular meetings with the program architects and communicating design decisions with team members.
    • Created low-level design documents, selecting the right tools and technologies and made sure that the software released to the public was as robust and secure as it could be.
    • Removed technical impediments and owned the overall sprint outcome.
    • Created new and extended existing microservices to deliver features to citizens, government officials, and solicitors.
    Technologies: Java, Spring, Spring Boot, PostgreSQL, NodeJS
  • Technical Lead

    2015 - 2017
    Callsign Inc.
    • Fully involved in the architecture, design, and development of new products and features.
    • Wrote a new, modern version of the Callsign Dashboard from scratch in React. I managed to phase out the old version of the product iteratively by working closely with product designers to rethink and redesign features and move them to the modern view. I performed regular demos to stakeholders and developers from other teams to show the latest features and gather feedback and suggestions about further improvements.
    • Created an extended version of the Callsign Admin REST API which provides a standard interface for onboarding organizations and users into Callsign. As this is an externally facing service, the API has to conform to the highest security and performance standards and be well documented.
    • Contributed to Callsign On Premise (OP). We were tasked to extract part of the platform to allow deploying it on clients’ premises so that enterprises are in control of their transactional data. The challenge was to keep all OP installations in sync with Callsign Cloud in order to provide non-repudiation for security and audit purposes.
    • Developed Callsign PKI that allows Callsign Cloud to validate OP installations are trusted (CFSSL).
    • Developed Events Bridge that provides active unfiltered transmission of events from one site (Cloud or OP) to another.
    • Contributed to the development of Replication Bridge that provides passive filtered replication of changes from one site to another.
    • Architected and developed the first version of a multi-layered security engine that helps enterprises instantly detect and mitigate authentication threats. This later became one of the major selling points of Callsign.
    Technologies: Java, Spring, Spring Boot, Couchbase DB, ReactJS
  • Senior Engineer

    2011 - 2015
    Semafone
    • Designed, developed, and maintained the payment module in the company's award-winning software solution. The Semafone software provides secure voice transactions for contact centers and retailers taking cardholder not present (CNP) payments.
    • Ensured that the Semafone software is created and maintained using best practices and high security standards so it easily passes the frequent PA DSS certifications.
    • Contributed to the deployment of the Semafone software to clients' on-premise environments.
    Technologies: Java, HTML, JavaScript, jQuery, MySQL
  • Software Engineer

    2008 - 2011
    Business Systems (UK)
    • Designed, built, and supported a platform for call recording and workforce management technologies encompassing quality monitoring, analytics, and workforce management.
    • Designed and developed an asynchronous call storage and archive library which was used to archive call recordings to the company’s internal data storage or to transfer them securely to clients’ premises.
    • Implemented public SOAP and RESTful APIs which were used by the company’s mobile developers and external parties to create and manage conference calls.
    Technologies: Java, GWT, JavaScript, HTML, Firebase SQL

Experience

  • Mettle (Development)
    https://www.mettle.co.uk/

    Forward-looking business bank account.

  • Callsign (Development)
    https://www.callsign.com/

    Real-time AI-driven identity and authentication solutions that confirm the user is really is who they say they are, at work and at home.

Skills

  • Languages

    Java, JavaScript, HTML5, CSS, SQL
  • Frameworks

    Spring, Spring Boot, Spring Security, React Native
  • Tools

    IntelliJ IDEA, Git
  • Paradigms

    Agile
  • Platforms

    Web
  • Storage

    Spring Data REST, Couchbase
  • Libraries/APIs

    React, jQuery

Education

  • Bachelor's degree in Computer Science
    2005 - 2009
    Sofia University - Sofia, Bulgaria

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