Tadas Tamošauskas

I've been shipping for clients since 2010 — most hire me again, and some of what I build is still powering businesses a decade later.

How we can work together

MVP launch: get your first version in front of users fast, so you can iterate towards product-market-fit or your next raise.

AI-assisted engineering: set up your AI-assisted engineering pipeline so a small team iterates and ships faster without hitting the vibe-coding debt ceiling.

Fractional engineering lead: tap into a senior engineer on an ad-hoc basis — think of it as a fractional lead engineer as a service.

Retainer / reduced-capacity backup: keep things chugging along when your team is stretched.

For established teams: a drop-in senior engineer for well-scoped projects or reduced-capacity periods.

What I can do

Building software: I am the most confident with Ruby, JavaScript and other similar web-dev ecosystems. I've run them in the cloud as well as on self-hosted servers. But, especially with AI, this is not a limiting factor. I can also guide your architecture, design and build APIs, set up delivery pipelines, automate your infrastructure and help with product direction. See my CV for a more detailed list of my skills and past experience.

Building and leading a dev team: I have interviewed, hired and mentored developers for many teams. I can help you set-up your recruitment and onboarding pipeline, then train a replacement for myself.

Tech & skills

AI-assisted engineering

Agentic coding workflows (Claude Code, Cursor, MCP), LLM-powered product features (RAG, tool-calling, evals, structured output), OpenAI & Anthropic APIs.

Languages & frameworks

Ruby, Ruby on Rails, Sinatra, Hotwire, JavaScript, React, Elixir, Phoenix, HTML, CSS, Tailwind.

Infrastructure & cloud

AWS, GCP, Terraform, Ansible, Docker, Kamal, Heroku, Git, infrastructure-as-code, zero-downtime deployments, continuous delivery.

Data & APIs

PostgreSQL, ElasticSearch, REST and Twirp APIs, third-party API integration, SAML / single sign-on.

Ways of working

TDD, Kanban, metrics-driven decisions, system architecture, team mentoring, hiring and onboarding.

What sets me apart

I care: I care about my reputation — most of my clients have hired me more than once. I have limited time on each project, so I do my absolute best with it.

I see the big picture: seeing things from a technical angle is not enough. I always study the domain, then take a step back and consider the end user needs before making important decisions.

I'm pragmatic about AI: I use AI tooling where it earns its keep and I'm clear-eyed about its limitations. I'm here to get your product shipped, not to ride a hype train.

I've run my own micro-SaaS products: from pdfcv.com over a decade ago to Inbox Airlock more recently, I'm familiar with the challenges of building and running a SaaS end-to-end, so pragmatic product advice comes as part of the parcel.

What others have to say

Tadas is an extremely versatile and effective senior engineer - you can introduce him to a problem, and he'll digest it and coordinate with the rest of the team to get it sorted fast.

He's got a great entrepreneurial attitude: he'll give useful insights and raise important questions across the whole business given a chance. Can't recommend hiring him enough.

Tadas has made a huge impact in the year that he's worked at Trainline. He has the rare combination of awesome technical skills and the ability communicate supremely with his peers.

During his time here he's consistently delivered way above expectations. His Ruby skills are excellent, but even more impressive is his ability to foster close collaboration and his drive to make the project succeed. He has improved communication and process across teams in our London office and built strong ties with teams co-located internationally.

I hope to work with Tadas again in the near future and would offer him a permanent position on the team without hesitation.

Tadas is an excellent developer, he understands complex environments and finds creative solutions to difficult problems. Tadas is great at taking user needs and creating clear success criteria leading to useful features for the products he works on. Tadas is really reliable and insightful, he always delivers on time.

More recommendations on LinkedIn

Sample projects

Most of my work nowadays is client work on private repos, but here are some projects that can be seen in public:

• pdfcv.com - a decade+ old side-project that still has paid users.
• An open source guide to becoming a contractor in the UK.
• A Discord community for UK IT contractors.
• Inbox Airlock - a micro SaaS to declutter your Gmail inbox (now shut down).

Get to know me better

I share code on GitHub, and occasionally post my learnings on LinkedIn.

Check out my CV in a pdf file or on LinkedIn, or email me tadas.tamosauskas@gmail.com.