👋 I am a Software Engineer and Engineering Leader looking for an impactful role in a human-friendly, mission-driven product company.
This printout was snapshotted from jevakallio.dev on .
I am a product engineer with 15 years of professional experience building web and mobile applications across various architectures in cloud and serverless environments.
I have a proven track record assembling and managing happy, cohesive and high-performing engineering teams. I’ve grown into a manager in progressive people-first companies, and I have experience making good teams great.
I believe in fostering communities online and offline. I speak at conferences, run meetups, teach workshops, and contribute to open source software projects.
Most importantly I do my best to be a decent, empathetic human being who’s fun to work with. In my free time I perform improv and stand-up comedy, write fiction, and pursue other creative endeavours.
You are a mission-driven product company with an ethical business model. You’re most likely in consumer products or development tooling space.
You care about the social and human impact of your product, and understand that user needs are as important as business goals, if not more so.
You value diversity, inclusion and your employees’ autonomy, and demonstrate this with reasonable, flexible working hours and a WFH policy.
Ideally, you’re based in London or fully remote, but if all of the above applies to you, I am open to relocation and remote roles.
What can I do for you
I am interested in both hands-on engineering and management roles. Here are some of the things I can do for you.
Architect and implement modern, high-quality web and mobile applications and backend systems, combining good programming practices and latest tools and technologies.
Apply Design Thinking and Agile Software Engineering methodologies to run the product development lifecycle from conception to production.
Build and manage engineering teams with a focus on diversity & inclusion and a fun and sustainable work environment, leveraging my network and developer advocacy experience in hiring.
Help your company achieve its goals by driving organisational change from top-down, and fostering a collaborative, cross-functional team culture from bottom-up.
I am proficient in web application design and engineering using React, GraphQL, TypeScript/Flow, web standards, and various other frameworks, libraries and tools.
I am a world-class expert in mobile app development using React Native, and have shipped a dozen applications for iOS and Android since the framework's initial open source release.
I am passionate about user interface design and development, and I enjoy both the minutiae of UI design in Sketch, Figma, Adobe XD etc, and deploying designs at scale using design systems and pattern libraries.
As a full-stack developer I have built resilient, large-scale Node.js services and deployed them to AWS, GCP and Azure in containerised, serverless, and PaaS environments.
I have a solid grasp of software engineering fundamentals such as functional and object-oriented programming paradigms, relational and document-oriented database design, application and system architectures.
I am familiar with modern cloud deployment, hosting, and data storage strategies and architectures, though I am by no means an expert.
I’m also keen to learn new things. Particularly, I am interested in ReasonML, Rust/WASM, Kotlin, SwiftUI/Jetpack, and gaining a deeper understanding of machine learning and data science.
Major League Hacking
Open Source Mentor (Full-time, Remote, June-August 2020)
Led and supported a team of 20 international students contributing to open source projects such as React, React Native, Relay and Jest as part of the MLH Open Source Fellowship program.
Vice President Engineering (London, 2016-2019)
I founded Formidable's UK/EU office, and in three years built it from ground up into a profitable multi-million dollar company. I was responsible for the entire consulting business lifecycle from client acquisition and recruitment to successful delivery.
I hired and managed a high-performing team of engineers with a focus on the team's personal and professional growth and work/life balance. I cultivated a culture of of learning, quality, innovation, autonomy and ownership, and maintained a near-100% employee retention over three years.
I worked in various client-facing roles as a consultant, project tech lead and solutions architect, and wrote tons of React, React Native and GraphQL code.
Senior Software Engineer / Team Lead (London, 2014-2016)
As a senior full-stack engineer, I typically worked as a customer-facing project lead, developing web and mobile applications with React and React Native on the frontend, and Node.js or Clojure on the backend.
I am a Certified Scrum Master, and in addition to building products, I focused on helping teams work effectively. As the most senior developer in our London office, I coached teams, mentored junior developers, and provided training and specialist consultancy to other Futurice projects across Europe.
Lead Developer (Helsinki, 2011-2014)
Software Engineer (Helsinki, 2009-2011)
I developed the company’s CRM system, SharePoint-based extranet portal, public website and marketing campaigns, mainly using ASP.NET WebForms, ASP.NET MVC and legacy systems.
A.P. Møller Mærsk
SAP Business Warehouse Developer (Copenhagen, 2007-2009)
I worked with the SAP Business Warehouse product, developing web interfaces and KPI dashboards on top of business intelligence data.
Freelance Web Designer
Self-employed, part time (Helsinki, 2001-2007)
I put myself through school doing part-time web development and graphic design, mostly simple HTML/CSS-based websites for small businesses. Thank god nobody in Finland had yet heard of Wordpress, or I would’ve been out of a job.
Here are a few selected open source projects I've created.
A personal knowledge management and sharing system for VSCode
Persistent Redux store for Offline-First applications, with first-class support for optimistic UI.
The first popular React Native starter kit, focused on functional programming, immutable state, and other good practices of its time.
VSCode Hacker TyperStar
Great for live coding presentations, impressing your friends, or just trying to look busy at work.
Automatically builds and deploys pull requests in your React Native projects, and replies with a QR code you can open directly on your device or emulator.
A few conference talks from over the years.
This is a talk about you
React Native EU, Poland 2018
A dystopian tale of your life as a software engineer accompanied by music and illustrations. By far the weirdest, and most popular talk I’ve ever done.
YouTube: This is a Talk About You
Writing Code Like A Real Hacker
Reactivate X, London, 2018
A pure comedy lightning talk about how I built a VS Code extension to make myself a 10x engineer. This is by far the least prepared, and at 300k+ views, the most seen talk I’ve ever given.
YouTube: Writing Code like a Real Hacker
Good Enough Still Isn’t Good Enough
Chain React, Portland, Oregon, 2018
A call to arms for UI engineers to harness the power of new, more productive technologies in order to improve the lives of our users, not only our companies’ bottom line.
This talk is targeted for React Native developers, but relevant for all UI engineers.
React, Collaborate and Listen
React India, 2019
An introspective look at React development five years on, and what we should do to best to serve our users while supporting the health of an open, democratic web.
YouTube: React, Collaborate and Listen
Offline for the Greater Good
React London, 2017
An overview of how and why to build offline-first applications with React and Redux, ending with a release of a new open source project, redux-offline.