Hire me

If you like the kind of projects and technologies I've been working on, I'm available for hiring. I'm mainly interested on remote freelance projects (both short and long term), but sometimes I'm open to considerate employee positions or to do onsite projects, if both the tasks and the offer are interesting, and we can negotiate the terms and conditions. You can get more info about my past work experience in my LinkedIn profile or in my Curriculum Vitae.

My ideal job (AKA Santa's letter)

How could it be?

  • Company has something that makes it different from the other ones, and make it not to be "just another one". It can be anything, like a really interesting and unique project, exceptional perks, being a boost in my career, incentivate workers initiative and personal side projects, a lot of paid holidays, being able to work with a known and prestigious person and learn from him... Any thing that, if having several alternatives with equal conditions, could make me choice to join that company instead of any of the others ones.
  • Makes a difference, both for my career and to make the world a better place.
  • A responsability position with decision on projects and company future, and with real posibilities to improve both of them, also in ways not directly job related but also oriented to work conditions and the company itself.
  • Travel frequently. I'm a travel junkie, so although I understand the concerns of others, for me it's a plus, so the more the merrier. If it's for assistance to conferences, double score :-)

By the way, this points are a common factor of the big guys, like Google, Apple, Microsoft, Amazon... Salaries, laboral conditions, prestige and the kind of projects they work with, give them instant VIP status and a fast past in my priorities list, but you can get in it too if your offer seems to me as interesting as theirs (or you are able to sell me really well your best points and what makes your company different to others and why working on your company is a true once-in-a-lifetime opportunity).

What could it have or provide me?

  • Interesting, creative and stimulating projects, allowing me to learn about new skills, technologies or knowledge areas that can be of my interests (not necesarily just only related to computer engineering).
  • Research & Development projects, specially in academic contexts. Jobs with real posibilities of publishing academic papers will always be of my interest and have priority over others than don't.
  • Incentivate workers to improve themselves and achieve technical excelence. This includes (but not only just sticks to) that the company fulfills the Joel's test
  • All company code and intellectual property (at least the one not directly related with the company's bussines model) is published as Open Source and/or as Creative Commons.
  • 100% remote positions with flexible schedule and management based on async communications, with clear specificacions, roadmap and requirements. This does not exclude of having face-to-face meetings, but according to my experience, anything beyond a 10% of the time (one day each two weeks) for a hands-on meeting or for team building purposses, can be solved more efectively in a remote way.
  • Travel expenses and fully paid accomodation during all my relocation time, no matter how long is it.
  • Bonuses and beneficts directly acountable to both my own performance and the company one.
  • Acknowledge of my involvement in the company (including voluntary overtime), being this in both short term beneficts and revenues (bonuses, extra paid holidays, travels for leisure or bussines, technological equipment...) and long term ones (additional shares or equity).

Main expertise areas

  • Projects auditories
    • Project structure and code quality
    • Development best practices
  • Open Source and Open Standards evangelization
  • Systems programming
  • Software & systems architecture
  • Expertise consulting
  • Technical leadership and guidelines
  • Design of high performance systems
  • Design of clean and minimal specifications, protocols and APIs, with special attention to details, corner cases and not-so-common use cases
  • Backend & full-stack web development
  • Frontend web development & web APIs
  • Mobile multi-platform apps (React Native, PWAs)

And more specially, to do what any others can't :-)

In detail info about my knowledge areas and experience can be found in the uses page.

Other areas I'm interested to work with

  • Research & Development, high-edge technologies and new specifications
  • Operating systems design
  • Filesystems design
  • WebAssembly
  • WebRTC
  • Drivers development

Areas willing to improve or learn

  • Robotics
  • FPGAs and/or hardware design
  • Rust programming language related projects
  • Unsupervised machine learning
  • Natural Language Programing
  • Quantum computing

Open Source professional collaborations

  • Wasmer
  • Kurento

Additionally, I've been contracted to work in the design and development of some Open Source projects for the next companies:

  • Toucan events
  • Veedeo.me
  • takeafile
  • Telefónica

Private collaborations

  • BotXO
  • bpost
  • lingbe
  • Ventrata
  • qvantel
  • Vocento

Interviews FAQs

Interesting or habitual questions I've been asked during job interviews, or when negotiating with clients to work on a freelance project.


🤝 Introduction questions

Why should I hire you? What makes you different from other candidates?

Computers engineering has been my vocation since I was 14 years old, and since then I've been involved with computers in a lot of aspects, like being one of the most active member of MadridWireless and AlcorcónWireless citizen wireless groups or Madrid Macintosh Users Group, or being one of the founder member of Robotic and Domotic Spain Association. I've been working as computers programmer professionally since 17 years old, and also being involved in Open Source communities since then. I love puzzles and anything that can be an intellectual challenge to me (that's one of the reasons I started to learn chinese), and for me programing is like a sort of creative jigsaw. Due to that, I've been involved in the development of more than 300 Open Source projects, some of them awarded in national championships, and also I've being invited to do keynotes and stand-up at several national conferences, and I'm proud to say that I have been able to work all my life in my true passion.

My background has provided me a lot of experience and knowledge in almost all computers engineering areas, both professionally or in side projects, so I can be able to understand the implications of each decision at several levels (extra costs, delays, performance issues, bandwidth usage, user experience, possible bottlenecks...), and clearly explain the systems tradeoffs and business implications that are derived for each one of them. I love high edge technology and to know how everything works and what's able to do. This gives me a tendency to put technology on its limits, sometimes unconsciosly and anothers on purposse, by using the code or service beyond the developer original intention, but also to find and use the most concise, specific and idiomatic way of doing the things by using any available feature or design decision that can help to write a clean and maintenable code, that usually leads me to find bugs and usage corner cases. That also has lead myself to put high attention on code quality and to develop simple and minimal APIs in all the code I develop, and to enforce that high quality standards on others.

What's your opinion about code tests?

I have a "no code tests" policy, it's time I can't dedicate to my freelance projects nor my friends, family or hobbies. I have more than 10 years of Open Source code published in my Github account, that clearly show my capabilities and code quality standards. If you consider that's not enought and need to check yourself my work, you can contract me for some hours both to do an actual task in your code base, so you can evaluate my work on first hand. If you still insists that I need to do a code test, it's better that your offer really interest me (specially about the payment), or I would discard it since you don't respect candidates (your future employees) work-life balance.

By the way, big guys like Google, Apple, Microsoft, IBM, Amazon, Ebay... don't do code tests, or they are short ones like katas to know about your reasoning, but instead they do in-site technical interviews instead. It's true their selection processes are long and tyring and you need to prepare yourself for them in advance, but not only their job conditions, salaries and prestige compensate that effort, but also they usually pay flight tickets and hotel rooms just so devs can be able to go to their offices and interview them. They value their candidates time, and invest in them, so don't be more picky than them, and show that you are truly interested in your candidates too.

Are you available to relocate?

I'm interested mostly on full remote positions (specially on frelance projects), or job positions located in Madrid, Spain. I'm open to relocation depending of conditions, but mandatory ones are:

  1. salary is at least the same I would earn after a job change here on Madrid, plus a proportional increment to adjust to live and cost level of destination city, whichever is higher.
  2. company provides me accomodation during all my contract or re-imbourse me the flat rental as an addition over the salary.
  3. company provides me flight tickets for both joining and leaving the company, and to go home and back at least twice a year (one of them for Christmas).

On the other hand, I'm a travel junkie, so I don't have any problem about travel frequently (in fact, I consider it a plus).

💻 Technology

What's your favorite tech stack?

I don't have a fixed one and I'm flexible with the technology to be used, it mostly depends on what one does the best fit for each project, but in general terms, depending of what's the project scope and in order of preference, my favorites ones are:

  • Low level: Rust or C/C++
  • High level: Node.js or Python, depending on the priority on each poject about IO performance or code readibility. I also love to use high level languages for non-critical low level programming when possible, like filesystems, hardware drivers, automation, building tools... or, why not, full operating systems :-) At this moment I'm also considering Rust as an interesting alternative too.
  • UI: CLI and terminal tools, web-based technologies, or ReactNative
  • web frameworks:
    • backend: JAMstack, fastify, Django or Twisted. It also depends of the fit of technology to each project, or availability of resources, allowed time or off-the-shelves libraries
    • frontend: React Native (both for portable mobile aps and web), React, and for performance and code compatibility with desktop and server, combined with Rust compiled to WebAssembly

Are you interested in learning new technologies? Which ones and why?

At this moment I'm learning about Machine Learning and AI, where I'm more interested in Natural Language Programming and Understandable Neural Networks, and I'm improving my skills with Rust programming language. I'm also interested on learning about Quantum Computing, and recently I self-teached about Verilog HDL and hardware design. I'm a hands-on learner and a bit obssesed with technical details, so if I get some interesting project between my hands or find something that I think can be fixed or improved, I don't have problems learning new skills or knowledge that can be useful to me to do it, specially if they are stablished and future-proof industrial standards and not just some temporally fashioned or hyped libraries and frameworks.

What are the three things you think are the most important to improve a software project?

  1. Fully automate all processes, remove the human factor allways that's possible
  2. Register and trace all the errors, so they can be replicated later
  3. Document the behaviour that should have the project, and update it while it's being implemented with its actual one

🏆 Achievements

What's the technical challenge you are most proud of?

I've designed and developed my own Operating System NodeOS with more than 6000 stargazers on Github and winner of national Universitary Free Software Championship. It was also my bachelor thesis, graduated with distinction.

You can find more info about this and other projects I've worked on and that I'm proud of, both mine or from others, in the projects page.

Could you share some numbers about the projects you've worked on? e.g.: users, requests, downloads, etc

  • NodeOS has more than 6000 stargazers on Github
  • Published more than 175 packages in npm
  • 3 times winner of CUSL, spanish national Universitary Free Software Championship (PirannaFS, ShareIt! and NodeOS)
  • Worked on two adquired start-ups (Kurento and lingbe)
  • Referenced in the book HTML5 for Masterminds by J.D. Gauchat due to my pioneer work on WebRTC with DataChannels-polyfill

👨 Personal questions

What are your hobbies outside of work?

Besides working on my own research side projects, I like running, travelling, diner out, visit museums, going to cinema or reading, between others.

What achievements are you more proud of, outside of technology?

I'm mostly proud of the achievements with my personal side projects (technoology is my hobby), but besides that, I'm also proud of have done the New Year's Eve 10km run in 53 minutes, and that I've started learning chinese.

If you could be able to organize an intelectual dinner, what three people (live or dead) would you invite?

The two first ones would be Nikola Tesla, and my friend Elisenda Bou, one of the most brilliant minds I've ever meet 😛

Third one would be a bit more difficult. Thomas Edison is a good option as a justapoint of Nikola Tesla, but although being a good inventor too, it was a bit prepotent and pretentious. Leonardo da Vinci would be my next option (was one of my idols since a child), but it's a bit topic and outdated, so in a more actual context I would have doubts to choose between Elon Musk or Steve Jobs. That would make four and no three persons, but being there all of us 5, that would be a really interesting dinner and maybe new projects or new ideas would appear there.

I'm not sure if Steve Jobs could sound a bit cliche or more like a strange selection, since he's the only one that's not an engineer. Apple is now a consumer product and a status symbol, but before his death, due to his high standards Apple computers were a simbol of quality and things well done and a creative tool. It's documented that he wanted macOS to be an Open Source operating system like Linux, and this was not possible because by doing so, Microsoft would not port Office suite to it. Something similar happened with iTunes Store, where he doesn't want to use DRM on their published songs, allowing them to be freely usable and redistribuible, and he was forced to add it by an exigence of discrographic records. This kind of ideals about free and open knowledge and culture are something I totally feel identified myself with.

What things do you have in your personal "life's to-do" list?

My major dream since I was a child was to became an astronaut, since I had the idea that as a scientist, it was not possible to get higher, both literal or metaphorically. The main reason was to feel ingravity, so since now I've lost almost any oportunity to became an astronaut, now on absolut top of my list is to do a zero G fligth 🙂.

In second place, it's to do a travel around the world. I don't have a particular destination or route, just only to visit as most countries as possible... and return to my journey's origin from the other side :-D Relate to that, a recent incorporation to the list is to became myself a member of the Travelers' Century Club, that represent travelers who have visited 100 or more of the world's countries and territories (by the moment I've visited 13 and counting). Also related to this is to visit Antartica and join the 300 Club 😀.

How do you expect your boss should be?

The most important things, it has a technical background, so it can understand when it's explained what problems does we have or why something can't be done.

The second one, make money is not its priority, and it's managing the company because really love what it's doing and believe in the company itself, alse when it's in losses. It must not take decissions just only for money no matter the consecuences, I truly believe that work must be done by some reasons besides money, and make money must be just a collateral effect of working, not its main reason to be. I have already changed jobs in the past just for that single reason, where nobody cared by the company and everybody was there only for the (huge) monthly payment, including me. When I got myself that I was not behaving according to my ethic principles, I left the company.

🏢 Company culture

What types of companies have you worked in? e.g.: startups, consulting, enterprise, agencies, etc

I've worked for some stablished enterprises like Telefónica, and a couple of times for consulting firms or at freelance agencies, but the ones I've worked more times and enojed the most has been as freelance projects on my own and on startups, some of them later adquired by bigger companies like Kurento (adquired by Twilio) or lingbe (adquired by italki).

What type of company would you like to work for and why?

I like to work on startup companies, or in a startup-like minded team, since they are the most creative and dynamic ones. I would like to work on research & development or on a company that has its own product, and a company that's mostly focused on the quality of their product over any other aspect, instead of being directed by sales or any predefined deadlines.

In short: I want to work on an engineering company, not just a technological one.

What do you look for in a company or project?

  • Engineering companies, not technology ones.
  • Innovation, design of new technologies, and usage and development of open and standard specifications. I totally identify myself with the motto of my alma mater, the Rey Juan Carlos University: non nova, sed nove ("not a new one, but in a new way").

In a similar way, I consider myself a practical person but with ethical principles, and hope the ones of clients and companies I work with are aligned to mines:

  • "Make money" is not one of the company main priorities (both directly or indirectly), nor it's of their clients, or at least it's not the main purposse of the project I'm going to work with. I work mostly for the project and the technology themselves and what I can learn from them, not for their revenues. Acording to my ethos, money and beneficts must always be a collateral effect of work and a medium to achieve experiences, not a main objective by itself.
  • If money is a direct or indirect core concept of the project up to the point that removing it makes the project pointless, probably I would not be so much interested on working on it if there's no other elements like the technologies being used or the project concept or the oportunities that it can provide me, but definitely not by the project itself alone.

Do you prefer to work alone, or as part of a group?

I like to work in a group, specially on small ones focused on a single project where there's a clear roadmap on what to do, or where technical expertise of co-workers is high and everybody is trying to do their best. This open the door to the posibility of discuss the different approachs to the problems and learn ones from the others. In the same way, when I have a lead or expert role, I like to surround me of co-workers with good technical skils so I can take in account their points of view too when defining the project architecture, the development guidelines or the project quality bar that other have to follow. In other cases where that's not possible, I usualy like to work as part of a group where people can be focused each one on an area of the code that they can master and know in detail and manage it on their own, so everybody can be able to focus on their knowledge area.

What do you value the most about a team?

  • Team members are motivated, distressed, and working together for the same goal
  • Everybody is focused trying to achieve technical excellence, and doing their best instead of doing it fast
  • Co-workers are technically as good as me or better, so I can be able to learn from them, or they have initiative and are eager to learn and improve themselves

As cleary explained at https://mailchi.mp/bonillaware/sabotear-tu-empresa, these points are a direct result of having a motivated team, and that's a responsability of the company itself:

To motivate our team members -beyond a correct retribution- we only need to create an environment where they can do their work well, where each time they can do it better and, in addition, they contribute to a purposse whom they believe, beyond earn more and more money.

Do you currently have a job? What do you like and dislike about it?

Currently I'm working as Tech Lead Backend and DevOps for BotXO as my main job, and I'm activelly looking for a project to work on remote as freelancer in my spare time (maybe yours! :-D ).

👍 Likes
  • walking distance from my home
  • lots of schedule flexibility
  • reduced day all the year
  • over average payment
  • interesting technological area (chatbots)
👎 Dislikes
  • legacy code and design decissions, and almost no time sloted to fix them
  • architecture complex and very cohexionated, with lots of inter-dependencies between projects

What would motivate you to change job?

  1. The most important, an interesting project that caught my attention and motivates me to do the change by itself, no matter any other things like salary, relocation or social beneficts. This can be the project topic, technologies being used, the profesional or academic career oportunities that it can offer me...
  2. A salary according to my expectations.
  3. Quantity and quality of social beneficts provided in addition to the salary, specially restaurant card, public transport card, gym subscription, remote work, flexible schedule...

What would motivate you to join a new project?

  • Higher salary maintaining or improving all my perks and social beneficts
  • Work on a research project, ideally somewhat related to own research areas
  • Position with responsability that could help me to improve my career both profesional and academically, with publishing of papers

What you are looking for in your next job?

A project I can feel my own and get involved on it, helping to define its shape. Also a project that can make me proud of and help to learn new things and improve my career, ideally both profesionally and in academic areas.

If I made you an offer, what would make you to reject it?

If we get up to this point, probably I would have already consider the pros & cons regarding changing my current job, so only I would reject a job offer if the tasks I would be involved are not motivating enought, or the final salary difference with my current job would not compensate the change (this includes the case when relocation is required and it makes me a drop in my buying level and/or life quality), so it's better that we discuss these topics in the first interview.