Haseeb Annadamban
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Haseeb Annadamban · Senior Rails engineer

A faster Rails app.
A stronger product.

I help SaaS teams resolve performance bottlenecks, improve established Rails applications, and ship practical AI features. Ten years of production experience, backed by client results and merged contributions to Gumroad, Discourse, and OpenProject.

My performance work is inspectable, not just promised. The case studies show the queries, benchmarks, regression tests, pull requests, and client outcomes behind the results—with production engagements clearly distinguished from open-source contributions.

Discuss your project See recent results

Available for remote consulting and contract work

Rails & PostgreSQL✦ AI-assisted workflows✦ Integrations✦ Performance✦ Agent tooling✦ Legacy systems✦ Production engineering

01 Open-source performance improvements Merged upstream

Real codebases.
Reviewable results.

Performance fixes for Gumroad, Discourse, and OpenProject: measured bottlenecks, regression tests, and changes reviewed and merged by maintainers. This is open-source contribution work, not a claim that these projects are clients.

Benchmark results describe the workloads documented in each case study, not measured changes to these projects’ live production traffic. Your application’s results will depend on its own bottlenecks.

Explore all case studies

02 Latest case studies Problems, approach, results

Recent work.
Results in context.

The latest detailed accounts of performance problems, the engineering approach used to address them, and the measured outcome.

View all case studies

03 Services Focused engagements

Senior engineering for
the work that matters.

Choose the service that matches the problem in front of you—from Rails performance and modernization to practical AI features and workflows.

01 Rails · Performance

Performance optimization

Find production bottlenecks, implement high-impact fixes, and validate them against a measured baseline.

Explore service 02 Rails · Modernization

Legacy modernization

Upgrade aging Rails systems incrementally while keeping the product stable and available.

Explore service 03 Rails · Engineering

Rails consulting

Bring senior, hands-on engineering to difficult delivery, architecture, and integration work.

Explore service 04 AI · Rails

AI for Rails apps

Add a useful AI-assisted feature inside the Rails product your customers already use.

Explore service 05 AI · Operations

Workflow automation

Turn one repeatable process into a practical AI workflow with human review built in.

Explore service
Compare all services

Not sure where to start? The initial fit discussion is free. We’ll clarify the problem, available access, and scope before any paid work begins.

04 Production work

Software people rely on.
Work clients can trust.

Beyond open source, I have delivered production work across education, compliance, and SaaS—from faster dashboards to integrations and infrastructure upgrades.

Nonprofit education platform

Learning tools with a human outcome.

Built spaced-repetition, pronunciation, and reading tools for a nonprofit serving underserved students—including work families credited with improving their children’s grades.

Product engineering · Applied AI

Financial compliance platform

Complex workflows made operational.

Built employee-compliance and vendor-due-diligence systems, plus meeting transcription across Google Meet, Zoom, and Microsoft Teams.

Workflow systems · Integrations

SEO automation product

From more than two seconds to under 200ms.

Cut dashboard load time by over 90%, removed crawler memory bloat, and improved sitemap processing speed and worker reliability. Read the production case study.

Rails · PostgreSQL · Performance

Large-scale SaaS platform

Core product work at million-user scale.

Improved page speed, rebuilt a CMS rendering system, raised SEO performance, upgraded critical infrastructure, and delivered new integrations.

Architecture · Modernization

05 Testimonials Client perspective

What clients say.
In their own words.

Feedback from founders who have trusted me with their products, workflows, and production systems.

Haseeb combines strong technical experience with good product judgment, takes ownership, and moves quickly even when requirements are ambiguous. Haseeb doesn't just write code, he understands the problem and ships reliable solutions. I'd gladly recommend him to any team looking for an experienced engineer who can make a good impact

Glenn Espinosa CEO · Luthor (YC F24)

Haseeb played an important role in building and scaling Interlynk’s backend during a time when the software supply chain and SBOM ecosystem was still evolving. With few established patterns to follow, he was comfortable navigating ambiguity, studying specifications such as SPDX, and translating complex requirements into practical product capabilities. He contributed across performance optimization, PostgreSQL-heavy data workflows and more. Haseeb consistently approached complex technical problems with curiosity and ownership, helping us build reliable solutions in a challenging and emerging domain.

Ritesh Noronha Co-Founder and CTO · Interlynk

My biggest concern with contractors now is whether they can come in and use AI to be more productive. I'm no longer interested in developers who want to code by hand. I want developers who know how to code, of course. But I want devs who can use that software experience to leverage AI to be more productive. Haseeb is that. He came on and was immediately able to leverage the tools available to build stuff for us at least 2x faster. He's a joy to work with!

Neeraj Kapoor Founder · learntobe.org

06 AI work in public

AI-assisted delivery.
Engineering discipline included.

I use AI to accelerate the work, not to skip understanding or validation. My open-source tools show how I build repeatable workflows with verifiable outputs, approval gates, and documented handoffs. These are public engineering projects, not claimed client deployments.

02 / Open-source tooling

pi-runbooks

Turns repeatable agent work into versioned runbooks with approval gates, checkpoints, output verification, and evidence-based revisions.

TypeScript · Workflow governance · Pi
03 / Open-source deployment

pi-ship

Deploys Pi to SSH-accessible Linux servers for terminal, Telegram, or Slack access without public ports, TLS, webhooks, or manual setup.

TypeScript · Linux · Remote agents
See all projects on GitHub
Haseeb Annadamban

07 Engineering perspective

Senior judgment. Hands-on delivery.

I work directly with founders and engineering teams to understand unfamiliar systems, make the trade-offs explicit, and deliver reviewable changes. Rails and PostgreSQL are my deepest stack; Python and TypeScript support my AI and workflow tooling. Based in Kerala, India, I work remotely with international clients.

Founders and technical leaders at Luthor, Interlynk, and Learn To Be describe my ownership, product judgment, and delivery in their client testimonials.

More about my background

Focused engagements · Senior contract engineering

What is slowing
your product down?

Tell me what is happening, why it matters, and your timeline. We’ll identify a sensible first engagement before committing to implementation.

Discuss your project