AWS Certified Solutions Architect – Associate
Amazon Web Services
Cloud architecture across 15+ AWS services
Issued Feb 2020
View credentialAbdullah Al Masud Tushar · Software Engineer - Product Builder
Build your nextBackend & DataEngineering SaaSsolutions with me!
7+ years successfully building cloud SaaS platforms and revenue-generating software solutions while working remotely with global product teams
7+ years in production20+ Data Pipelines orchestrated with Airflow500+ time-series curves published5M+ requests/day served75% cloud cost eliminated20+ engineers mentored on AWS3,100+ GitHub stars earned
Engineering identity
Think in outcomes. Build end to end.
Product engineering
Backend-heavy full-stack engineering
Python and Django are my core, but I build the whole product—from React and Next.js interfaces to APIs, databases, Cloud infrastructure, and CI/CD.
Data platforms
Data engineering
Production-grade Python and Airflow data pipelines for batch and streaming workloads, from reliable ingestion to dependency-aware orchestration to publishing time-series curves with scheduling, monitoring, alerting, and incident response.
“Make it work, make it observable, make it cheap to change. In that order.”
From the people I’ve worked with
“He is a highly capable scrum master and highly skilled Python developer and will make a key contribution wherever he goes.”
Shin Lim · Tech Lead of Tushar on Ferdia
“There is no better colleague than Tushar.”
Sifat Hassan · Worked with Tushar on the same team
“He is a colleague I would be honored to work with again.”
Erik Ormevik · Tushar was Erik's client
Core Competency
One builder. Every layer, connected.
Backend & APIs
- Python
- JavaScript
- TypeScript
- Django
- FastAPI
- Node.js
- Celery
Data Engineering & Pipelines
- ETL
- Airflow
- Kafka
- Pandas
- Time-series data
Cloud & Infrastructure
- GCP
- AWS
- EC2
- ECS
- ECR
- Lambda
- S3
- RDS
- ALB
- SQS
- SNS
- SES
- IAM
- VPC
- CloudFront
- CloudWatch
- Route 53
AI & Agentic Engineering
- Claude Code
- Codex
- Agentic Engineering
- RAG pipelines
- LLM API Integration
- Embeddings
- Vector DB
Databases & Storage
- PostgreSQL
- MySQL
- DynamoDB
- MongoDB
- Cassandra
- Redis
DevOps, Testing & Delivery
- Docker
- Kubernetes
- CI/CD
- Prometheus
- Grafana
- Pytest
- Git
Product Engineering & Frontend
- React
- Next.js
- Tailwind CSS
- HTML/CSS
Licenses & certifications
Claims are cheap. These are verified.
Professional Scrum Master™ I
Scrum.org
Agile delivery, practiced daily on remote teams
Issued Aug 2021
View credentialIntermediate Secure Coding in Python
SecureFlag
Hands-on secure-coding labs in Python
Issued Feb 2026
View credentialCompetitive programming
Pressure built the pattern. Teaching multiplied it.
contestant@darkprinx
verified public record
CodeChef2001Peak ratingHistorical peak · darkprinxCodeforces1554Peak ratingSpecialist · 734 problems solvedLeetCode415Problems solved70 easy · 282 medium · 63 hardUVa572Problems solved1,004 submissions · uHunt rank #806LightOJ307Problems solvedWorldwide ranking 72HackerRank5★Problem Solving + SQL34 algorithm challenges · 52 SQL challenges
National & regional programming contests
- 03City University Inter-University Programming ContestEWU_Avengers2nd runner-up · 40 teams
- 26NSU Cybernauts'16 National Programming ContestEWU_DeadLocK26th of 115 teams
- 28ACM ICPC Dhaka RegionalEWU_Avengers28th of 150 teams
- 28UAP National Collegiate Programming ContestEWU_DeadLocK28th of 126 teams
- 30SUB Inter-University Programming ContestEWU_Avengers30th of 95 teams
- 32ACM ICPC Dhaka RegionalEWU_DeadLocK32nd of 123 teams
- 32CUET National Collegiate Programming ContestEWU_Avengers32nd of 147 teams
- 54AB Bank IUT 8th ICT Fest Programming ContestEWU_DeadLocK54th of 102 teams
Volunteering
Jun 2017 – Mar 2018
Lead Trainer · ACM Problem Solver Community
Ran weekly competitive-programming sessions, building a problem-solving community across universities.
Dec 2016
Trainer & Organizer · East West University
Organized and taught a competitive-programming camp for university students.
Aug 2017
Trainer · SWAP (Student Welfare Association)
Delivered introductory competitive-programming training.
Apr 2017
Trainer · City University
Led a 3-day competitive-programming workshop.
Mar 2017
Trainer · Notre Dame University
Led a 5-day introductory programming workshop.
May 2015
Trainer · United International University
Delivered a 4-day competitive-programming training.
Campus wins
1st in Intra University Programming Contest
1st in Programming Battle Summer 2016
2nd in CSE Fest Programming Contest
Experience
Different systems, same standard: ship work that lasts.
Senior Software Engineer
Cefalo
Part of a 200+ engineer offshore organisation building for Norwegian industries: first taking 50% ownership of end-to-end full-stack development for a recruitment platform, then moving into backend and data engineering for a $550M green-energy market data and forecasting platform.
Backend & data engineering
Volue Insight
- Ingest, transform, and publish 500+ time-series curves consumed daily by internal teams and external customers of a $550M green-energy market data platform.
- Run 20+ production Airflow DAGs orchestrating end-to-end pipelines across multiple data sources, including scheduling, retries, and dependency management.
- Automated the trunk-based CI pipeline (build, test, image publishing, deployment, release notes) and made the whole team faster.
- Resolve broken pipelines surfaced by SLO alerts and customer reports, with root-cause analysis across team boundaries.
Full-stack ownership
SmartCruiter
- Held 50% ownership of end-to-end design and development of a full-stack recruitment platform built with Django REST Framework, TypeScript, Next.js, AWS, and PostgreSQL.
- Built a job recommendation service using Apache Solr, designed to save users an average of 5–10 minutes per job search.
- Deployed services to ECS Fargate and ECR: auto-scaling with zero server management, no EC2 provisioning.
- Built a local mobile-payment subscription system with proprietary APIs and scheduled jobs for one-time and recurring billing, designed to reach 70% of potential subscribers.
Software Engineer
Brainstation 23
Built and improved products for global clients: a high-traffic trivia platform for Robi and a transport ERP for the $2.33M-funded Norwegian startup Ferdia.
High-traffic cloud backend
Robi trivia platform
- Kept a consumer backend healthy at 5M+ requests per day.
- Cut the monthly cloud bill by 75% through API improvements, query optimisation, and caching, resolving the client’s budget concerns in weeks.
- Boosted average engagement 30% with scalable friendship and chat features on API Gateway, Lambda, and DynamoDB.
Transport ERP · Norwegian startup
Ferdia
- Owned the organizational-unit management service powering RBAC, solving hierarchical CRUD with Modified Preorder Tree Traversal and taking query complexity from O(N) to O(1).
- Resolved critical security vulnerabilities by locking down exposed customer data in S3 buckets, while keeping access to existing data smooth for users.
BSc, Computer Science & Engineering
East West University
Where the systems habit started: competitive programming and years of teaching others to think in algorithms.
Algorithms · mentoring · national circuit
Foundations
- Mentored 200+ EWU students in algorithms and data structures; trained 110+ students across three universities.
- Placed 28th of 150 at ACM ICPC Dhaka Regional 2017 and 3rd of 40 at City IUPC 2017.
- Problems solved: UVa 572 · LeetCode 415 · LightOJ 307.
- Earned 5★ in HackerRank Problem Solving; peak ratings: CodeChef 2001 · Codeforces 1554.
Products & systems
Built around problems. Proven by outcomes.
Volue Insight · via Cefalo
Energy-market data pipelines
- Context
- A $550M green-energy market data and forecasting platform, where traders and analysts depend on fresh curves every day.
- Built
- 20+ production Airflow DAGs moving data from raw sources to published output: Python ingest and transform jobs feeding 500+ time-series curves, with an automated trunk-based CI pipeline behind them.
- Impact
- Curves that internal teams and paying customers rely on daily, and broken pipelines caught by SLO alerts before customers feel them.
- Python
- Airflow
- PostgreSQL
- Cassandra
- GCP
- Github action
- Docker
- Prometheus
- Grafana
SmartCruiter · via Cefalo
Recruitment platform SaaS
- Context
- A recruitment platform startup that needed one engineer to own half the product, from design through deployment.
- Built
- Owned 50% of full-stack product delivery across Django REST Framework, Next.js, TypeScript, PostgreSQL, and AWS, including an Apache Solr job-recommendation service and a local mobile-payment subscription engine.
- Impact
- Job recommendations designed to save 5–10 minutes per search, auto-scaling infrastructure without managed servers, and a payment path designed to reach 70% of potential subscribers.
- Django REST
- Next.js
- TypeScript
- PostgreSQL
- Solr
- AWS
Robi · via Brainstation 23
High-traffic trivia backend
- Context
- A consumer trivia product for Bangladesh’s second-largest telco: five million requests a day, and a cloud bill the client could no longer justify.
- Built
- Backend hardening across APIs, database queries, and caching; then serverless friendship and chat features on API Gateway, Lambda, and DynamoDB.
- Impact
- 75% of the monthly infrastructure bill eliminated in a short timeframe, and average user engagement up 30%.
- AWS Lambda
- DynamoDB
- API Gateway
- Caching
Ferdia · via Brainstation 23
Org-hierarchy service for transport ERP
- Context
- A Norwegian ERP platform digitising coach and charter bus operations, where role-based access hinged on a complex organisational tree.
- Built
- The organizational-unit management service, redesigned around Modified Preorder Tree Traversal to make hierarchical reads constant-time.
- Impact
- Query complexity down from O(N) to O(1) on the service every permission check depends on.
- Python
- MPTT
- RBAC
- SQL
Independent R&D
Marginalia — cited RAG document Q&A
- Context
- A personal research tool: upload PDFs, text, or Markdown, ask questions against them, and get answers that trace back to the exact source passage instead of opaque LLM output.
- Built
- Next.js 16 and React 19 app on a two-stage RAG pipeline: documents are chunked into overlapping passages, embedded with Gemini Embedding 001, and stored in Prisma over SQLite; queries are ranked by cosine similarity and answered by Gemini 2.5 Flash through Anthropic’s Claude Agent SDK, streaming cited responses as NDJSON.
- Impact
- Every answer ships its sources before the response even finishes streaming: click a citation mark and the cited passage surfaces in a margin panel, turning a chatbox into an auditable research tool.
- Next.js
- TypeScript
- Prisma
- SQLite
- Gemini
- RAG
Open source
Break The Ice With Python
- Context
- Learning Python in public: an educational repository of 100+ programming problems with detailed solutions.
- Built
- A structured, beginner-friendly path through Python fundamentals and OOP, maintained as a living resource.
- Impact
- 3,100+ GitHub stars and 1,500+ forks, and thousands of developers learned Python fundamentals from it.
- Python
- OOP
- Open source
Recommendations
People I have worked with, in their own words.
Every recommendation on my LinkedIn, unedited: managers, clients, designers, and the engineers I mentored.
As the UX designer during the development of our recruitment portal, I had the pleasure of collaborating with Tushar. Throughout the project's phases, his systematic approach shone through, establishing him as a steadfast member of our technical ensemble. Tushar's adeptness in backend systems, paired with his diligence in refining our Jira workflow, was instrumental in ensuring our project's orderly progression. Although the crux of our collaboration was on design and development, Tushar's proactive endeavor to grasp the nuances of UX played a pivotal role in bridging the gap between design blueprints and their practical execution. Beyond his evident technical proficiency, our work environment was uplifted by Tushar's collaborative spirit, we shared a lot of good laughs! Reflecting on our partnership, I can confidently endorse Tushar for development roles, recognizing his potential to integrate seamlessly into and enrich any team.
Teodor Tomter Liland
Fotograf, filmprodusent og designer
Worked with Tushar on the same team · September 21, 2023
Available for the right challenge
Have a hard product problem?
Let’s turn it into a dependable product that ships—and lasts.