John Costello
AeroLeads people directory · profile

John Costello Email & Phone Number

Software Engineer at Krumware
Location: New York City Metropolitan Area, United States, United States 4 work roles 3 schools
1 work email found @krum.io LinkedIn matched
✓ Verified May 2026 4 data sources Profile completeness 86%

Contact Signals · 1 work email

Work email j****@krum.io
LinkedIn Profile matched
3 free lookups remaining · No credit card
Current company
Role
Software Engineer
Location
New York City Metropolitan Area, United States, United States
Company size

Who is John Costello? Overview

A concise factual answer block for searchers comparing this professional profile.

Quick answer

John Costello is listed as Software Engineer at Krumware, a company with 8 employees, based in New York City Metropolitan Area, United States, United States. AeroLeads shows a work email signal at krum.io and a matched LinkedIn profile for John Costello.

John Costello previously worked as Software Engineer at Svelvet (Open Source) and Structural Engineer Intern at Core States Group. John Costello holds Master Of Science - Ms, Structural Engineering from Virginia Tech.

Company email context

Email format at Krumware

This section adds company-level context without repeating John Costello's masked contact details.

{first_initial}{last}@krum.io
89% confidence

AeroLeads found 1 current-domain work email signal for John Costello. Compare company email patterns before reaching out.

Profile bio

About John Costello

I'm a software engineer building full stack applications with JavaScript/ TypeScript, React/ Redux, Svelte, Node/ Express and SQL/ NoSQL. Recently, I have been contributing to Svelvet, a component library for building dynamic, node-based UIs and diagrams. Checkout the Medium article featured below for more information on the latest release!Github: https://github.com/johnlcos

Current workplace

John Costello's current company

Company context helps verify the profile and gives searchers a useful next step.

Krumware
Krumware
Software Engineer
columbia, south carolina, united states
Website
Employees
8
AeroLeads page
4 roles

John Costello work experience

A career timeline built from the work history available for this profile.

Software Engineer

Current
Jun 2024 - Present

Software Engineer

  • Developed version 9.0 of the popular library with over 2,000 GithHub stars and 150,000 downloads facilitated by OSLabs.
  • Used TypeScript in the creation of new features to maintain the type-safe nature of the codebase and enforce typing to streamline the user experience and reduce the risk of user error, while using custom interfaces and.
  • Leveraged Svelte's built-in state management and variable reactivity to craft the Toggle component, a visual and functional switch that seamlessly integrates with Svelvet's data flow system for efficient boolean.
  • Employed SvelteKit to create routes to sandboxes for use in testing and implement server-side rendering, enhancing route efficiency for swift and seamless rendering and interaction, thereby bolstering end-to-end.
  • Doubled end-to-end testing coverage to over 90% using Playwright in order to utilize browser contexts and parallel execution to efficiently test all major components, thus safeguarding the future of the library through.
  • Addressed 5 Github Issues posts in order to fix user identified bugs and implement user suggested features.
Sep 2023 - Dec 2023

Structural Engineer Intern

Somerville, New Jersey, United States

  • Developed detailed structural drawings and plan sets using AutoCAD to ensure precise documentation of project requirements.
  • Modeled structures in RISA 3D and Revit, conducting analysis of simulations to assess loading scenarios.
  • Evaluated existing wind, snow and seismic conditions and loadings for a site per ASCE-7 and IBC.
  • Performed design calculations in MathCAD and Enercalc utilizing design codes such as AISC, ACI and NDS design manuals.
  • Attended site visits to document existing conditions.
  • Reviewed shop submittals.
May 2022 - Aug 2022

Structural Engineer Intern

Ewing, New Jersey, United States

  • Utilized MathCAD and Excel sheets to streamline and optimize redundant structural design calculations, demonstrating proficiency in mathematical modeling and enhancing efficiency in the design process.
  • Developed structural drawings and plan sets for both reinforced concrete and steel bridges in MicroStation and AutoCAD Civil 3D.
  • Checked design calculations.
  • Performed quantity estimations based on preliminary drawings.
  • Utilized communication skills when working as part of a team with supervisors and co-workers.
  • Completed assigned tasks independently.
May 2021 - Aug 2021
Team & coworkers

Colleagues at Krumware

Other employees you can reach at krum.io. View company contacts for 8 employees →

3 education records

John Costello education

Advanced Residency For Software Engineering

Bachelor Of Science - Bs, Civil Engineering, Graduated Summa Cum Laude

Activities and Societies: Vice President of Chi Epsilon Civil Engineering Honor Society

FAQ

Frequently asked questions about John Costello

Quick answers generated from the profile data available on this page.

What company does John Costello work for?

John Costello works for Krumware.

What is John Costello's role at Krumware?

John Costello is listed as Software Engineer at Krumware.

What is John Costello's email address?

AeroLeads has found 1 work email signal at @krum.io for John Costello at Krumware.

Where is John Costello based?

John Costello is based in New York City Metropolitan Area, United States, United States while working with Krumware.

What companies has John Costello worked for?

John Costello has worked for Krumware, Svelvet (Open Source), Core States Group, and Hardesty & Hanover, Llc.

Who are John Costello's colleagues at Krumware?

John Costello's colleagues at Krumware include Richie Carter, Rudra Gupta, Edward Pomianowski, Hunter Adams, and Austin Loudermilk.

How can I contact John Costello?

You can use AeroLeads to view verified contact signals for John Costello at Krumware, including work email, phone, and LinkedIn data when available.

What schools did John Costello attend?

John Costello holds Master Of Science - Ms, Structural Engineering from Virginia Tech.

Find 750M verified contacts

Search by job title, company, industry, location, and seniority. Export verified B2B contact data when you need it.

People with similar names

Check these profiles if this is not the John Costello you were looking for.

View similar profiles