- Vanhemmat »
After ten months of hard effort, I landed my first developer job at the age of 40.

This is how, at the age of 40, I transitioned my profession to front-end programming, despite having no related experience or degree. While working full-time and spending next to nothing, I relied solely on self-directed education.

I wrote those ecstatic words a few months ago, as I prepared to start my new job for the first time. Come along with me on my adventure to find out how I got here.

Feeling unique

I used to read articles like this one with mistrust when I first started thinking about becoming a developer. I couldn't seem to find anything in the writer's past that distinguished them as "unique." As a result, they were well-suited for this position. Something I didn't have at the time.

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Since then, I've learned that this isn't how it works. To become a developer, there are no "specific" prerequisites. I won't tell you it's simple because it isn't. However, the good news is that all of the prerequisites are within everyone's grasp. You must be willing to put in a lot of effort, learn a lot, and be consistent. When things get rough, you must persevere. When you're feeling desperate and like you're not cut out for this, talk yourself out of it. That's all it takes, and with a little practise, anyone can do it.

I had no prior knowledge of the subject. I didn't have the funds for pricey courses, nor did I have the time in my already hectic schedule, and I was approaching middle age. Everyone's situation is unique, but I've learnt that if you set your mind to it, you can do anything.


I had never done any programming or had any experience with it until the day I typed my first line of code. My first job was in the restaurant industry. Then I acquired a degree in music technology and spent a decade in Spain teaching English as a second language. I wasn't even extremely computer literate. I was constantly enthralled by the latest technological innovations. I used to think of programmers as modern-day superheroes.

But I never considered doing it myself. Partly because I mistook coding for a high-status activity. Something for bright students who have graduated from prestigious (and pricey) universities. While such people do exist, the vast majority of coders aren't the Hollywood hacker type. I had no idea that development was so simple.

The beginning of the storey

It all began with a lively discussion with my partner. She was looking into the reasons for the lack of women in STEM fields, particularly in technology. She resolved to take action by becoming a coder herself. She aspired to be a role model for our family's younger girls. And with that, she began to learn about it.

That soon piqued my interest as well, as we found there are numerous resources available. This wasn't some esoteric expertise; it was a skill that we could learn and master.

Spoiler alert: she also transitioned from HR to development and was hired a month before I was.

As a result, we came across a children's book about programming in a scientific museum one day. We returned home, opened Notepad, typed Hello World, then pasted it into the browser, changing the colour to red. We were giddy with anticipation! What kind of sorcery was that?

I was really sucked in. I wanted to use code to create things, and I wanted computers to do what I said!

My previous position

I had been working with children for 8 years at the time. This will not be the standard section where someone complains about a dead-end job that they despise. Because I appreciated my teaching career, enjoyed working with children, and felt at ease in my surroundings. It was a rewarding and pleasurable experience.

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But, even if you adore something, there are times when you realise it's time to let go. It was the start of a new chapter in my life, and I had new goals and ambitions. Above all, I was looking for a fresh challenge. Something that would force me to step outside of my usual comfort zone.

The one and only way to success

This is certainly not the case. My partner, myself, and a good buddy all started learning to code for a career move around the same time. All three of us are now working in the field, and our approaches are extremely dissimilar. Each one used the materials and methods that were most effective for them. If there's one thing we all have in common, it's that we didn't give up and kept going. We've all put in a lot of effort and perseverance.

So, instead of telling you about the one true way, I'll tell you about mine. It's not the only way, and it's certainly not the best. That's how it worked for me.

Starting at the beginning

To get a sense of where to start, I started reading and watching YouTube videos about programming. Then I began experimenting with HTML and CSS. I built several basic web pages by following tutorials and coding along. This convinced me that it was something I wanted to pursue.

Establishing a Goal

For tips and assistance, I turned to two of my friends who work in the field. Those encouraging and guiding remarks were important in getting me started and focusing my attention on a clear goal.

It took some time to filter through all of the possibilities and set realistic goals that I could achieve. I needed to make a quick job move. I didn't have any source of money, so I had to keep working until I could make the transfer.

Front-end development seemed to be the most accessible and in-demand alternative. I reduced it down even more by focusing on the talents required for a startup position rather than the freelance option.

Then I set a deadline for myself. I didn't want my goal to end up on a to-do list that I never looked at again. It was the spring of 2017, and I had made a vow to myself that the next school course would be my last as a teacher. So I had to be working in the field by September 2018, a little over a year later.

It would be naïve to think that everything was crystal clear and under control at this point. I didn't do it. While making such a dangerous professional transition, certainty is not a luxury you can afford. There were numerous doubts at that time, as well as during the process. Persistence was crucial in this case. I was determined to take this route regardless of where it led once I made the decision.


I understood that studying for it was the only way to go. Waiting till “I had time” was never an option for me because I worked full-time. I had to do it while working, or I wouldn't be able to do it at all. I was fortunate in that my girlfriend was studying at the same time as me. This made it easier for us to plan our days so that we could get the most out of our learning time. We used to undertake what we called "weekend boot camps," in which we would code for the entire weekend. This was a regular day for me:

Then my summer vacation arrived, and I took advantage of it by converting my "weekend boot camp" into a "daily boot camp." Despite the urge to relax and enjoy the summer, I stuck to my programme religiously.

September rolled along, and I was back at work. I had made the conscious decision to work fewer hours. I accepted the fact that I would earn less money in return for more study time. It was also another step toward solidifying my resolve to a career transition.

It's tough to express how difficult it was to be separated from my code. All I wanted to do was return to my computer and complete this problem or correct that layout. But then it's back to reality. The beginning of a school year always necessitates a significant amount of planning and organisation. As any teacher will tell you, it also consumes a significant amount of personal time.

My objective could have been thwarted at that point. Despite my best efforts, I was finding it increasingly difficult to code. I began to lose my stride. I tried to keep up, but there were times when I just didn't have the time. Life may complicate things even with the best of intentions and enthusiasm.

In October, my GitHub activity showed a decrease.

I kept trying, as you can see from my GitHub activity image. Even if it was an hour, I maintained putting in the time, even if it was only reading an article. I did everything I could to avoid being completely demotivated. When you leave anything unattended for a long time, it becomes more difficult to return to with each passing day.

Then, as December arrived and the new year loomed ahead of me, I rallied once more and got organised. I began to press on, putting in those hours regardless of how exhausted I was or how little time I had. I would sometimes get up early to code, and other times I would stay up late.

This meant that my life was essentially restricted to working to pay the bills and studying. And that's about it. And I pretty much kept up that pace until the day I started packing to relocate to Madrid. That happened in the spring of 2018, well ahead of my deadline.

Resources and tools

I engaged myself in everything code-related for the ten months leading up to my job offer. On Twitter, the most common question I get is about the materials I used. I've prepared another essay that goes into greater detail on this topic. Here's a quick rundown of the most crucial tools and resources.


Udemy courses by Cassidy Williams and Colt Steele

JavaScript 30 and other courses by Wes Bos

Traversy Media, LevelUpTuts, Traversy Media, Traversy Media, Traversy Media, Traversy Media, Tra classes by Christina Truong

Udacity Nanodegree in Front-End Programming (a paid course, but I got a scholarship from Google)

Because courses can only take you so far, I supplemented them with other resources to aid my learning and job search.

Twitter has been a huge part of my life. Especially the #100DaysOfCode community, which has been tremendously kind and welcoming.

GitHub is a valuable learning tool, and it's where I hosted all of my projects for free. Employers frequently look there first to see your work.

Portfolio: Building it and other self-initiated initiatives taught me the most important growth skills.

You can also look at the GitHub repository for My Learning Tracker. It is a comprehensive overview of the materials and paths I followed during the first 10 months.

Tech needs to stop whining about talentTiistai 14.09.2021 15:53

I have many companies in my portfolio focused on talent acquisition and development for the tech ecosystem — Lambda School, Major League Hacking, Fourthrev, Contra, Marketerhire, Reforge, and Maven. Here is my message to tech — stop whining that you can’t hire enough senior and diverse people and figure out how to do more of the talent development yourself.
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When I was developing Rocketship Education, a network of high performing charter schools, I encountered a similar problem in education to what tech has now. Everyone knew that Teach for America (TFA) produced some of the best teachers in the country, but no one wanted to use TFA corps members (their residency for the first two years of teaching), because becoming a good teacher takes about two years, and so your school would just have this person who wasn’t that good for that time. So almost no high performing schools hired TFA corps members in mass. Instead, everyone waited until people had graduated TFA and then recruited them intensely. And then they whined intensely that there were not enough experienced TFA’ers to recruit.
At Rocketship, we took the opposite approach. We knew that TFA produced the best raw talent, but that with that talent came a huge professional development burden. Our opinion was that PD was worth it, because it created a virtually unlimited talent pipeline for us. So we spent several years getting very good at goal setting, coaching, and developing young teachers. And then we hired four new TFA corps members per school per year, flooding our system with talent. Ultimately that gave us an unfair advantage because once we had trained those young teachers, they were loyal to Rocketship, and almost impossible to recruit away.
Tech companies need to stop whining and do something similar. It’s obvious that the number of senior folks in most roles in tech are the limiting factor in those companies continued success. So just like with TFA, everyone runs around bidding those people up. And then they whine that you can’t find good diverse people who have already leveled up. Get over it. Tech needs to start hiring talented young diverse people who have no idea what they are doing and train them. The idea that someone shows up to your office knowing exactly what to do is not scalable, there just aren’t enough people, and you perpetuate the lack of diversity in the ecosystem.
Tech companies should recruit young people, often from non-elite colleges or with no college background but who attended good schools like Lambda School or FlatIron. To do that, companies need to get serious about internships, because you can’t rely on the crutch of a resume with an elite school to do your selection for you. Most companies will want to outsource their internship programs to companies like Major League Hacking, who can do it better than they can at a fraction of the cost.
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Once hired, the company needs to regard that young recruit the way we looked at young teachers at Rocketship. They didn’t know much, but they could learn fast if you trained them intentionally. Once again, I think a lot of that training will be outsourced, because it’s difficult and expensive to do in house. Organizations like Reforge, Maven and Lambda School will do a lot of the teaching and learning, but organizations will have to internalize this so that the job roles level up as their young people learn. Tech needs to own this problem, and create an intentional talent pipeline to produce the diverse senior engineers and other roles that are in such short supply.
Launch day at a startup is of course very exciting. In our case, we spent two years assembling the team, designing and building the tech, fundraising, building customer relationships, integrating with the street, and obtaining regulatory approval. Two years of hard work all leading up to a single launch day.
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Unlike at IEX (which similarly took about 2 years to build), Proof’s launch did not need to be a big-bang event. IEX is a marketplace, which means we needed a critical mass of customers on day one so that they could interact with each other and have a half-decent experience. At Proof, we are building an agency broker, and we can provide an excellent experience with even just a single customer. That means we can open the floodgates gradually, and keep an eagle eye on every individual order to make sure each feature of the product functions properly as we slowly ramp up trading activity and risk.
Both cases, though, did involve a mad dash leading up to launch: testing like crazy, chasing down every last bug and corner case (that we knew of!), tying up loose ends, etc. There are inevitably things that you push off until later as well as problems that don’t reveal themselves until after you go live. The hope is that you’ve built enough guardrails and alerts that when something does go wrong, at least you realize quickly and the damage is controlled, but you never really know how it will go until you take the leap and flip the switch.
At both Proof and at IEX, launch day was exhilarating and stressful, but in retrospect both launches went surprisingly smoothly. There is an unbelievable amount of complexity to a trading system — so many moving parts interacting with each other, so many edge cases and race conditions. As many times as we’ve done this before, and despite the thousands of hours of testing, it is still a surprise when things mostly just work as intended.

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This post is an overview of all the changes we deployed to our trading software over our first ten weeks in full production. Why publish these to the blog? First, we are proud of our ability to build and deploy to new features at a rapid pace. Our algo and platform have come a long way in a short time, and if we are able to maintain this pace of iteration and improvement, we believe we will have one of the most compelling offerings in the space before long.
Second, even with a strong experienced tech team like ours, bugs inevitably make their way to production. Nobody is perfect, and we don’t shy away from admitting our mistakes. So far at least, every issue we have encountered was identified quickly, caused modest damage, and was fully remediated within 24 hours. This is no coincidence: we have spent a great deal of energy building layers of guard rails, alerting mechanisms, and investigative tools. When fires do arise, we have the tools and experience to attack them with focus, precision, and speed. This post is an opportunity to reveal the nature of the problems that arise in a nascent trading system and what it takes to address them.
Finally, almost everyone on the team, myself included, spends the majority of their time on quantitative research and software development, so we love to showcase those efforts any chance we get. Hopefully this detailed look behind the curtain is helpful or at least interesting to others folks in the industry, especially those embarking on their own startup journeys. Also, please note that many of the descriptions below contain jargon and terminology specific to our trading system. These are meant more to provide a sense of the scope and scale of the changes we have made since launching, rather than providing a self-contained description of our trading platform. We plan to soon release a more accessible overview of our entire technology stack as part of our series on How To Build a Broker-Dealer (1, 2, 3, 4, 5).
High level summary
Date range: 3/29/21–6/4/21 (10 Weeks)
Total number of releases: 34
Major feature releases: 2
Bugfixes: 5
Commits: 345
Major Releases
Dynamic VWAP Model Paradigm Shift (04/21/21)
In the original version of our VWAP algo, each interval of time was treated independently: the dynamic volume prediction model would predict how much volume would trade in the upcoming X minutes relatively to the rest of the day; and the algo would schedule that proportion of its remaining shares to trade. More specifically, the volume model outputs where on the volume curve it believes the stock to be right now, and where it believes it will be X minutes in the future, and the algo extrapolates the rest. We noticed that in some cases the algo would trade multiple heavy intervals in a row, or multiple light intervals, and get a bit ahead or behind. For example at a given point intraday, the model might say it believes 50% of the day’s volume has traded so far and 60% will have traded by the end of the upcoming interval. In this case, the algo would schedule 20% of its remaining shares. At the start of the next interval, it might have revised predictions from that point to the next of 55% and 64%; and then a subsequent 20% of the then remaining shares would be scheduled (or in total, 36% of original shares over those two intervals). Looking at the two intervals together though, this seems suboptimal.
We decided to change the algo logic to work more gracefully and in sync with the dynamic volume model; instead of comparing the upcoming interval prediction to just the remainder of the day, the algo now also takes into account its prior trading activity. In the above example, the new algo logic would try to have the entire order 60% complete by the end of the first example interval, and then 64% complete by the end of the second (assuming it was a full-day order), as it is aware of the fact that it has gotten ahead and will try to fall back in line with the latest prediction. This was a fairly complicated change, especially with all of the corner cases around partial-day orders and optional auction participation.
Order Amendment Functionality (05/24/21)
This was by far the largest release we have made so far. For our initial launch, we decided to defer order replace functionality to a later date — i.e. the ability for a customer to amend the quantity or limit price of a live order. Order amendments are a standard use case, but the mechanics involved are actually quite complicated. One common approach is to treat an amendment as a “cancel/new” behind the scenes: in other words, cancel out the previously live order and create a new order for the balance with the adjusted parameters. One challenge with this approach is what do you do if you can’t cancel the original order, for example if it has a live child order currently locked into the closing auction? The cancel/new approach is also suboptimal in that child orders automatically lose their queue position on the street as they get cancelled and reissued.
We knew from the start, we wanted to implement “true” cancel/replaces where child order priority is preserved and all the different “stuck child order” scenarios are handled as gracefully as possible, but doing so is far more complicated so we put it on the back burner.
On April 29th, our pilot customer requested to amend an order, and we told them it wasn’t yet implemented, but this was the kick we needed to get our act together and finally build the thing. What ensued was a marathon of code changes and testing across several different applications in the system: the OMS, the algo, the UI, and every single post trade application (OATS, CAT, clearing, regulatory reporting) required major changes to accommodate amendment functionality. While we were at it, we modified the algo logic to send true replaces downstream as well, another significant lift. All in all, it took about 4 weeks from beginning this project to deploying it to production. It was exhausting but rewarding, and we are relieved to have it behind us. In our experience, making a similar scale change to the production trading system at any of our previous firms would likely have taken a year or longer.
Full list of changes by application
3/31/21: bugfix for issue where at the the start of the trading day, the algo would sometimes see the shares it had exposed to the opening auction and confuse these with the shares it was supposed to send for the first interval in the continuous market (so instead of sending additional shares, it might just do nothing and wait). The fix was for the algo to always wait until the opening auction was complete before determining its course of action for the first interval.
4/6/21: several features and enhancements added:
We incorporated our information leakage model such that a large order marked “need-not-complete” will only schedule what it considers to be a reasonable number of shares so as not to cause undue market impact.
Previously the algo would split-post between IEX D-Limit and Nasdaq when attempting to post passively; this change replaced Nasdaq with the security’s primary exchange.
In the case of a large and sudden, but sustained, price shift; certain passive orders might have previously sat in the market limited-away. This change allows the worker layer of the algo to re-price a limited-away post router if the parent order’s limit price has additional room to do so.
Introduced configurable auction collars to allow the algo to send orders to the auctions with more aggressive limits than our standard intra-day order collars.
4/7/21: bugfix; the implementation of #4 in the above change had a bug where in some cases the standard order collar would still be applied to auction orders (in addition to the new auction order collar). This bug had no impact in production and was fixed for the following day’s trading session.
4/12/21: two new algo enhancements:
Introduced randomness into interval timing.
Smoother scheduling of remaining shares in the order near the end of the day after sending a slice to the closing auction.
4/21/21: two new algo enhancements:
Dynamic VWAP Model Paradigm Shift (described in the Major Releases section above).
Introduced dynamic scaling of interval duration throughout the day: slightly longer intervals in the morning, slightly shorter intervals toward the close. The longer the interval duration, the longer the algo will attempt to pick up passive fills before requiring an interval’s shares to be completed (and potentially crossing the spread). Longer intervals mean there’s more variance around how far ahead/behind the algo may be relative to its target in a given moment. Because spreads are wider at the start of the day, this change gives the algo a little more opportunity to get passive fills and avoid paying those full spreads at the trade-off of slightly increased variance.
4/22/21: bugfix; as part of the VWAP model paradigm shift above, we introduced a bug where need-not-complete orders constrained by the information leakage model still used the total order shares, and not the smaller number of scheduled shares, when calculating the portion of the order that had traded so far. Affected orders still traded the appropriate number of shares, but they front-loaded the schedule. We identified the issue on the day of the release and fixed it for the following day.
- Vanhemmat »